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Idiosyncratic use of punctuation - which of these annoys you the most?

  • Declarations and assignments that end with }; (C, C++, Javascript, etc.)
  • (Parenthesis (pile-ups (at (the (end (of (Lisp (code))))))))
  • Syntactically-significant whitespace (Python, Ruby, Haskell...)
  • Perl sigils: @array, $array[index], %hash, $hash{key}
  • Unnecessary sigils, like $variable in PHP
  • macro!() in Rust
  • Do you have any idea how much I spent on this Space Cadet keyboard, you insensitive clod?!
  • Something even worse...

[ Results | Polls ]
Comments:64 | Votes:118

posted by janrinok on Monday July 03 2023, @09:52PM   Printer-friendly

Rocky Strikes Back At Red Hat:

The world of Linux has seen some disquiet over recent weeks following the decision of Red Hat to restrict source code distribution for Red Hat Enterprise Linux (RHEL) to only their paying customers. We're sure that there will be plenty of fall-out to come from this news, but what can be done if your project relies upon access to those Red Hat sources?

The Red-Hat-derived Rocky Linux distro relies on access to RHEL source, so the news could have been something of a disaster. Fortunately for Rocky users though, they appear to have found a reliable way to bypass the restriction and retain access to those RHEL sources. Red Hat would like anyone wanting source access to pay them handsomely for the privilege, but the Rocky folks have spotted a way to bypass this. Using readily available cloud images they can spin up a RHEL system and use it to download their sources, and they can do this as an automated process.

We covered this story as it unfolded last week, and it seemed inevitable then that something of this nature would be found, as for all Red Hat's wishes a GPL-licensed piece of code can't be prevented from being shared. So Rocky users and the wider community will for now retain access to the code, but will Red Hat strike back? It's inevitable that there will be a further backlash from the community against any such moves, but will Red Hat be foolhardy enough to further damage their standing in this regard?


Original Submission

posted by janrinok on Monday July 03 2023, @05:06PM   Printer-friendly

Not the iPhone maker's first think-of-the-children rodeo:

Apple has joined the rapidly growing chorus of tech organizations calling on British lawmakers to revise the nation's Online Safety Bill – which for now is in the hands of the House of Lords – so that it safeguards strong end-to-end encryption.

"End-to-end encryption is a critical capability that protects the privacy of journalists, human rights activists, and diplomats," Apple argued in a statement to the media.

"It also helps everyday citizens defend themselves from surveillance, identity theft, fraud, and data breaches. The Online Safety Bill poses a serious threat to this protection, and could put UK citizens at greater risk."

Apple, you may remember, announced in December 2022 that it will provide end-to-end encryption (E2EE) for most iCloud services.

"Apple urges the government to amend the bill to protect strong end-to-end encryption for the benefit of all," the iGiant's statement on the internet bill continued.

[...] As the draft law is currently written, the UK's communications watchdog Ofcom will have the power to instruct chat app makers and other tech companies to monitor conversations and posts for child sexual abuse material and terrorism content. Such data should be blocked or deleted when found, and potentially even reported to the cops, the government hopes.

If that doesn't lead to apps watering down or backdooring their E2EE so that data can be inspected in transit, it may bring about automated on-device scanning, which could end up censoring people's private chats or leaking them to the authorities – whether illegal activity was correctly or incorrectly detected. Such technology would be government-accredited, which means the app makers may have little choice over its eventual implementation.

Under that regime, an app or platform can't really say it offers truly strong E2EE on all messages if there's a chance those messages can be silently inspected by someone or some system outside the private conversation. There's a concern this all starts with tackling child abuse and terrorists – something with which the population won't generally have a problem – but will later lead to broader surveillance and censorship. It smacks of a government fed up with not being able to peer into private chatter whenever it feels necessary.

The Open Rights Group has a paper on the proposals here [PDF] if you want to read more about it. "According to an expert legal opinion, this bill would create the power to mandate some of broadest surveillance powers in any Western democracy," the body wrote in that document.

In February, encrypted chat service Signal said it will stop operating in the UK if the British government goes ahead with its Online Safety Bill as it stands.

And in April, other E2EE comms platforms Element, Session, Threema, Viber, WhatsApp, and Wire urged UK lawmakers to rethink the bill instead of "weakening encryption, undermining privacy, and introducing the mass surveillance of people's private communications."


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posted by janrinok on Monday July 03 2023, @12:19PM   Printer-friendly

The quantum equivalent to shooting your own feet:

A few weeks ago, Iran broke through worldwide media due to its announcement that the country had successfully developed and deployed quantum computing products to aid in its military operations. But even as Iran's Rear Admiral Habibollah Sayyari smiled at the cameras present in the announcement, the tech world was quick to notice that the gold-plaqued board being showcased as an example of the country's work on quantum computing was nothing more than an Amazon-available, ARM-based FPGA (Field-Programable Gate Array) development board.

It seems Iran took a bit longer than one would expect to actually run the numbers on its "quantum computing product." Only recently, the country issued an official withdrawal statement admitting that there was no quantum at all to its quantum announcement.

"The unveiling of the FPGA board in the said conference has conveyed this false mentality to the country's media space that the said board is a quantum processor, which was not the case," said the research vice chancellor for Imam Khomeini University (machine translation via Tasnim News). Note that the issue isn't with the announcement itself and how it was worded. Apparently, the issue was with the country's media.

Even so, the research vice chancellor insisted that Iran is indeed looking into quantum computing as an aid for its armed forces' missions, adding that "the principle of the problem of the proposed algorithm, dealing with the disturbance of surface vessels' positioning systems, is important and approved for the promotion of maritime security."

To be fair, FPGAs can be (and often are) paired with quantum computing elements - they're usually deployed in quantum control mechanisms, bridging the gap between standard computing (like the one that's powering your current reading experience) and quantum computing (and if you're reading this in a quantum computer, do make sure to leave us a note).

So the ARM development board could, perhaps, have been truly used for quantum computing research at some point. Even so, there's a difference between treading the quantum waters with an FPGA dev board and actually manufacturing and deploying devices such as Intel's own Tunnel Falls Quantum Processing Unit (QPU) or IBM's Quantum System One. But Iran's leadership apparently thought it best to reap the (now meagre and questionable) geopolitical rewards of throwing its hat onto the quantum computing ring.

That might've been a bad move - but only Iran's leadership knows for sure.


Original Submission

posted by janrinok on Monday July 03 2023, @07:32AM   Printer-friendly

http://www.righto.com/2023/07/the-complex-history-of-intel-i960-risc.html

The Intel i960 was a remarkable 32-bit processor of the 1990s with a confusing set of versions. Although it is now mostly forgotten (outside the many people who used it as an embedded processor), it has a complex history. It had a shot at being Intel's flagship processor until x86 overshadowed it. Later, it was the world's best-selling RISC processor. One variant was a 33-bit processor with a decidedly non-RISC object-oriented instruction set; it became a military standard and was used in the F-22 fighter plane. Another version powered Intel's short-lived Unix servers. In this blog post, I'll take a look at the history of the i960, explain its different variants, and examine silicon dies. This chip has a lot of mythology and confusion (especially on Wikipedia), so I'll try to clear things up.

The ancestry of the i960 starts in 1975, when Intel set out to design a "micro-mainframe", a revolutionary processor that would bring the power of mainframe computers to microprocessors. This project, eventually called the iAPX 432, was a huge leap in features and complexity. Intel had just released the popular 8080 processor in 1974, an 8-bit processor that kicked off the hobbyist computer era with computers such as the Altair and IMSAI. However, 8-bit microprocessors were toys compared to 16-bit minicomputers like the PDP-11, let alone mainframes like the 32-bit IBM System/370. Most companies were gradually taking minicomputer and mainframe features and putting them into microprocessors, but Intel wanted to leapfrog to a mainframe-class 32-bit processor. The processor would make programmers much more productive by bridging the "semantic gap" between high-level languages and simple processors, implementing many features directly into the processor.

The 432 processor included memory management, process management, and interprocess communication. These features were traditionally part of the operating system, but Intel built them in the processor, calling this the "Silicon Operating System". The processor was also one of the first to implement the new IEEE 754 floating-point standard, still in use by most processors. The 432 also had support for fault tolerance and multi-processor systems. One of the most unusual features of the 432 was that instructions weren't byte aligned. Instead, instructions were between 6 and 321 bits long, and you could jump into the middle of a byte. Another unusual feature was that the 432 was a stack-based machine, pushing and popping values on an in-memory stack, rather than using general-purpose registers.


Original Submission

posted by janrinok on Monday July 03 2023, @02:49AM   Printer-friendly

Potential Genetic Markers of Multiple Sclerosis Severity

Genes Linked to Most Severe Symptoms of Multiple Sclerosis:

In a bid to determine factors linked to the most debilitating forms of multiple sclerosis (MS), Johns Hopkins Medicine researchers say they have identified three so-called "complement system" genes that appear to play a role in MS-caused vision loss. The researchers were able to single out these genes — known to be integral in the development of the brain and immune systems — by using DNA from MS patients along with high-tech retinal scanning.

If further studies confirm the researcher's findings, reported in the September issue of Brain, the investigators say they could serve as markers for monitoring and predicting progression and severity of MS, an unpredictable disorder in which the immune system eats away at protective insulation around nerve cells. This approach, the researchers say, represents the beginning of precision medicine for MS and may ultimately allow designer therapies, as is being done for specific cancers.

In MS, nerve communication breaks down over time between the brain and the rest of the body, causing chronic and/or intermittent muscle spasms, tremors, imbalance, pain, numbness, depression, loss of bladder or bowel control and vision problems. MS is more common in women, and symptoms vary widely.

"Although we have treatments for the type of MS where symptoms come on in bursts — called relapsing-remitting MS — we don't have any way to stop the kind of MS in which the nerve cells start to die, known as progressive MS," says Peter Calabresi, M.D., professor of neurology and neuroscience at the Johns Hopkins University School of Medicine and co-director of the Johns Hopkins Precision Medicine Center of Excellence for Multiple Sclerosis. "We believe that our study opens up a new line of investigation targeting complement genes as a potential way to treat disease progression and nerve cell death."

For their study, the researchers used optical coherence tomography -- an imaging technique that allowed the researchers to look at the back of each patient's eyes and assess damage to the nerve cells in the retina -- in 374 patients with all types of MS. The patients were an average of 43 years old and mostly women (78%).

The investigators recruited these patients and performed imaging every few years from 2010 to 2017, yielding an average of 4.6 scans per participant over the course of the study. The scans were used to measure thinning of the layer of the nerve cells — known as ganglion cells — in the retina over time. The average rate of deterioration was a loss of 0.32 micrometers of tissue per year in each patient.

Then, using blood samples from the patients to collect their DNA, the researchers hunted for genetic mutations in those people with the fastest deterioration rates and identified 23 such DNA variations that mapped to the complement gene C3.

Next, to search for genes further linked to vision loss, they performed an analysis of an existing clinical trial group of another 835 people with MS, of whom 74% were women, and whose average age was 40. Each participant underwent periodic vision testing about every year to distinguish their ability to detect contrast — finer and finer shades that distinguish light versus dark. The test requires the person to read five letters in a row as with a typical vision chart test, as well as separate vison charts with faint (low contrast) letters that simulate vision in low light (dusk or dark).

Using DNA from the blood samples of these 835 participants, the researchers identified specific genetic changes in two complement genes, C1QA and CR1, linked to those people with the most rapidly declining ability to distinguish letters with less contrast. Patients with genetic changes in the C1QA gene were 71% more likely to develop difficulty detecting visual contrast, whereas those with genetic changes in the CR1 gene were at 40% increased risk for developing a reduced ability to detect contrast.

These complement genes found to be linked with severity of MS vision loss hold the genetic instructions for making complement proteins.

Journal Reference:
Fitzgerald, Kathryn C, Kim, Kicheol, Smith, Matthew D, et al. Early complement genes are associated with visual system degeneration in multiple sclerosis, Brain (DOI: 10.1093/brain/awz188)

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posted by janrinok on Sunday July 02 2023, @10:00PM   Printer-friendly
from the Science dept.

NASA's Mars helicopter 'phones home' after no contact for 63 days. https://nordot.app/1047625013294923986?c=592622757532812385

Washington (AFP) - Long time, no speak: NASA has re-established contact with the intrepid Ingenuity Mars Helicopter after more than two months of radio silence, the space agency said Friday

[...] Ingenuity's 52nd flight launched on April 26, but mission controllers at NASA's Jet Propulsion Laboratory (JPL) in California lost contact as it descended to the surface following its two minute, 1,191-foot (363-meter) hop...

The loss of communications was expected, because a hill stood between Ingenuity and Perseverance, which acts as a relay between the drone and Earth.

"Ingenuity is designed to take care of itself when communication gaps like this occur, but we all still had a sense of relief finally hearing back."

Data so far indicates that the heli is in good shape. If further health checks also come back normal, Ingenuity will be all set for its next flight, westward toward a rocky outcrop the Perseverance team is interested in exploring.


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posted by janrinok on Sunday July 02 2023, @05:17PM   Printer-friendly
from the just-park-it dept.

First of its kind study quantifies mental and physical health value of urban parks:

A new framework developed by University of Waterloo researchers demonstrates the significant economic health savings and benefits from urban park investments.

In the first case study of its kind in Canada, researchers looked at Peterborough's new Quaker Foods City Square park, which cost taxpayers $6.4 million, and have estimated the economic value of physical and mental health benefits that could come from it at more than $4 million per year. The framework considers the health savings associated with improved mental health and better air quality, the avoided economic burden of physical inactivity and higher life satisfaction.

The study demonstrates the value of developing and enhancing urban parks as a strategy to improve population health and well-being, and as a means of cost savings to the medical system.

"Investments in urban parks are among the soundest financial decisions a community can make," said Jeffrey Wilson, professor in the School of Environment, Enterprise and Development. "When you consider the population health benefits, the value of lessening climate-related impacts and the role of parks to support economic development, we see how parks provide a large payback."

Journal Reference:
Wilson, Jeffrey, and Xiao Xiao. 2023. "The Economic Value of Health Benefits Associated with Urban Park Investment" International Journal of Environmental Research and Public Health 20, no. 6: 4815. https://doi.org/10.3390/ijerph20064815


Original Submission

posted by hubie on Sunday July 02 2023, @12:32PM   Printer-friendly
from the in-Orange-County-no-one-can-hear-mosquitoes-scream dept.

Drone deployed to fight mosquitoes in Southern California:

A drone flies over a peaceful Southern California marsh and unleashes a rain of larvae-killing bacterial spore pellets. Its target: a surging population of mosquitoes that can spread diseases to humans.

The drone is the latest technology deployed by the Orange County Mosquito and Vector Control District to attack mosquito development in marshes, large ponds and parks.

[...] Common methods of applying anti-mosquito treatments involve use of backpack sprayers, trucks, airplanes and helicopters. The drone allows more precise treatments and avoids the need to trample through sensitive lands, according to the district.

[...] The drone is flown higher than all nesting birds and allows access to places that can't be reached by a person with a backpack sprayer or trucks, Nguyen said.

Nguyen said the drone is able to treat 1 acre (0.4 hectares) of land in under two minutes, a task that would take more than an hour of hiking by a worker with a backpack.

[...] The anti-mosquito treatment is not harmful to other wildlife.

"The mosquito larvae are filter feeders, so they feed on the bacteria," Savage said. "It enters their gut and it's a growth regulator. So essentially—if you guys have seen the movie 'Alien'—it blows their stomach out."

[...] So far this year, West Nile has not been detected in the Orange County district but Nguyen is nowhere near declaring victory over the pests.

"It's more of a battle," he said. "You're not going to win the war against mosquitoes, but you can gain some ground. And with advancements in technology, we're gaining ground."


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posted by hubie on Sunday July 02 2023, @07:51AM   Printer-friendly
from the to-sub-orbit-and-beyond dept.

Virgin Galactic's First Commercial Spaceflight Is A Success - SlashGear:

Virgin Galactic, the private space tourism company, announced today that it has completed its first ever commercial space flight without a hitch. This mission, titled "Galactic 01," was crewed by six people total, including members of the Italian Air Force and National Research Council of Italy.

[...] In August, Virgin Galactic plans on launching the "Galactic 02" mission, and thereafter begin monthly flights.

The VSS Unity reached speeds of Mach 2.88 and an apogee (greatest distance of an orbiting object) of 52.9 miles. This successful flight comes after test flights resumed last month, nearly two years after no successful space missions were conducted. Virgin Galactic sets itself apart from more conventional space missions that utilize large multi-stage rockets like the ones used by NASA, and other private space companies like SpaceX.

[...] If you want to take part in a Virgin Galactic space mission, you can sign up, and it will set you back a cool $450,000.


Original Submission

posted by hubie on Sunday July 02 2023, @03:03AM   Printer-friendly
from the dirty-pool dept.

https://arstechnica.com/health/2023/06/its-summer-and-that-means-disturbing-swim-advisories-heres-our-top-5/

It's summer, and that means health organizations will be periodically showering Americans with reminders of how public swimming venues are actually nightmarish cesspits teeming with microbes that can burn your eyes, ravage your intestines, and eat your brains.

In attempts to communicate some pretty basic health advice—like, don't pee or poop in a public pool and try to avoid gulping toxic algae from lakes—health organizations create a mesmerizing fountain of hilarious, graphic, disturbing, clumsy, and sometimes perplexing advisories.

Given this wellspring of vomitus summer fun, here are our picks for the top five public health advisories bobbing in the waters this summer.
[...]
3. The dipstick test

If swimming pools suddenly seem too confining and ill-equipped to handle the loaded loads we're plunging, maybe a swim in a nice, big, natural lake sounds nice this summer? Think again.

The Wisconsin Department of Health Services wants to ensure you don't swim in any toxin-toting blooms of blue-green algae. In helpful, picture-based tips, the department advises against swimming in water that looks like green pea soup or green latex paint—in case any of those options seemed enticing. Dead fish and "floating scum, globs, or mats" are also (apparently not obvious) signs to stay away.


Original Submission

posted by janrinok on Saturday July 01 2023, @10:20PM   Printer-friendly
from the defensive dept.

https://arstechnica.com/gaming/2023/06/steam-mods-reportedly-blocking-games-that-use-ai-generated-artwork/

Valve has reportedly become the latest company to react to the uncertain legal landscape surrounding AI-generated artwork by simply barring its use in submitted materials. An anonymous developer going by the Reddit handle potterharry97 reports having a Steam game page submission rejected for the use of "art assets generated by artificial intelligence that appears to be relying on copyrighted material owned by third parties."

Potterharry97 originally posted about the rejection in a May post on the now-private GameDev subreddit (partially archived here, Google Cache here). In that post, potterharry97 admitted that "a large portion of the assets have some AI involvement in its creation" through the use of Stable Diffusion. In a follow-up post this month on the AIGameDev subreddit, potterharry97 wrote that the initial submission was intended as an early placeholder version, "with 2-3 assets/sprites that were admittedly obviously AI generated from the hands."
[...]
These days, the use of AI-generated art can sometimes be easier to catch, as was the case with potterharry97's Stable Diffusion sprites and their telltale hands. But that might get tougher as improvements in generative synthesis models make AI art more and more indistinguishable from art created by a human.

As potterharry97 put it in his initial Reddit post, "Even if I redo everything from scratch, how can I definitively prove if something was or wasn't AI generated?"


Original Submission

posted by mrpg on Saturday July 01 2023, @05:35PM   Printer-friendly
from the tank-girl-1800 dept.

Women hunt in vast majority of foraging societies, upending old stereotypes

For decades anthropologists have witnessed forager women—those who live in societies that both hunt and gather—around the world skillfully slay prey: In the 1980s, Agta women of the Philippines drew bows and arrows as tall as themselves and aimed at wild pigs and deer, and Matses Amazonians struck paca rodents with machetes. Observations from the 1990s described Aka great-grandmothers and girls as young as age 5 trapping duiker and porcupine in central Africa.

A study published today in PLOS ONE has united these reports for a first-of-its-kind global view of women hunters. Reviewing accounts penned by scholars who study culture, known as ethnographers, as well as those by observers between the late 1800s and today, the researchers found that women hunted in nearly 80% of surveyed forager societies.

These data flatly reject a long-standing myth that men hunt, women gather, and that this division runs deep in human history.

Worldwide survey kills the myth of 'Man the Hunter'


Original Submission

posted by mrpg on Saturday July 01 2023, @01:00PM   Printer-friendly
from the IRS-the-A-stands-for-Al-Capone dept.

https://arstechnica.com/tech-policy/2023/06/youtube-scammer-who-stole-millions-in-song-royalties-sentenced-to-5-years

A YouTube scammer conspiring to run what Billboard described as possibly the largest music royalty scam in history, Jose Teran was recently sentenced by the US government to 70 months in prison.

He was hit with a "significant sentence," US attorney for the District of Arizona, Gary Restaino, wrote in the sentencing memo, because of the "greed and the great lengths" that Teran's scam went over the course of five years to fraudulently claim rights to 50,000 songs. Ultimately, the scam routed $23 million in royalty proceeds away from mostly Latin artists and into the bank accounts of Teran and his co-conspirators.

Teran, the sentencing memo said, "obtained more than $6 million in personal profits" and continued pocketing $190,000 in stolen royalties—which he hid from officials—even after he was indicted for the fraud. Partly because of this, Teran is considered a "high-risk to re-offend," Restaino wrote.
[...]
Artists attempted to bring a class-action lawsuit against YouTube to gain access to systems to monitor their royalties and stop royalty theft, but that case was dismissed earlier this month before going to trial.

Teran could attempt to run the scam or something like it again, Restaino wrote. The US government considers Teran at high risk to re-offend, partly because just 12 days after being summoned for his indictment, he promptly created a new bank account to stash additional stolen payments sent from AdRev.


Original Submission

posted by mrpg on Saturday July 01 2023, @09:21AM   Printer-friendly
from the say-formaggio dept.

Elusive neutrinos reveal a portrait of our galaxy unlike any before:

From visible starlight to radio waves, the Milky Way galaxy has long been observed through the various frequencies of electromagnetic radiation it emits. Scientists have now revealed a uniquely different image of our galaxy by determining the galactic origin of thousands of neutrinos — invisible "ghost particles" which exist in great quantities but normally pass straight through Earth undetected. The neutrino-based image of the Milky Way is the first of its kind: a galactic portrait made with particles of matter rather than electromagnetic energy.

The breakthrough was achieved by a collaboration of researchers using the U.S. National Science Foundation-supported IceCube Neutrino Observatory at NSF's Amundsen–Scott South Pole Station in Antarctica. The immense observatory detects the subtle signs of high-energy neutrinos from space by using thousands of networked sensors buried deep within a cubic kilometer of clear, pristine ice. The results were revealed at an event at Drexel University and published in the journal Science.

[...] "As is so often the case, significant breakthroughs in science are enabled by advances in technology," says Denise Caldwell, director of NSF's Physics Division. "The capabilities provided by the highly sensitive IceCube detector, coupled with new data analysis tools, have given us an entirely new view of our galaxy — one that had only been hinted at before. As these capabilities continue to be refined, we can look forward to watching this picture emerge with ever-increasing resolution, potentially revealing hidden features of our galaxy never before seen by humanity."

"What's intriguing is that, unlike the case for light of any wavelength, in neutrinos, the universe outshines the nearby sources in our own galaxy," says Francis Halzen, a physicist at the University of Wisconsin–Madison and principal investigator at IceCube.

[...] Over many decades, scientists have revealed countless astronomical discoveries by expanding the methods used to observe the universe. Once-revolutionary advances such as radio astronomy and infrared astronomy have been joined by a new class of observational techniques using phenomena such as gravitational waves and now, neutrinos. Kurahashi Neilson says that the neutrino-based image of the Milky Way is yet another step in that lineage of discovery. She predicts neutrino astronomy will be honed like the methods that preceded it, until it too can reveal previously unknown aspects of the universe.

"This is why we do what we do," she says. "To see something nobody has ever seen, and to understand things we haven't understood."

Here is a link to an animated GIF showing the neutrino image oscillating in and out of a visible light image of the galaxy.

Journal Reference:
IceCube Collaboration, Observation of high-energy neutrinos from the Galactic plane, Science, 380, 2023. DOI: https://doi.org/10.1126/science.adc9818


Original Submission

posted by hubie on Saturday July 01 2023, @05:54AM   Printer-friendly
from the it's-raining-x-rays-hallelujah dept.

The discovery hints that auroras on all planets except Neptune have a common explanation:

Mercury's auroras are perfectly in character. While temperate Earth gets heavenly light shows over its poles, hellish Mercury gets invisible ribbons of X-ray radiation that cling to its sun-blasted surface.

But as alien as they may appear, Mercury's X-ray auroras have a lot in common with Earth's polar lights, and with auroras throughout the solar system.

Scientists have now directly shown that fluctuations in Mercury's magnetic field can fling electrons toward the planet, where they eventually rain down and cause auroras of X-ray light. This process, called electron precipitation, now appears to be practically universal in the solar system: It causes auroras on every planet with a global magnetic field except Neptune, researchers report July 18 in Nature Communications. Even Mars, which has only localized magnetic fields, has auroras caused by raining electrons (SN: 3/19/15).

[...] Buffeted by the solar wind, the sun-facing side of a planet's magnetic field gets squished while the night side is swept out into a long "magnetotail" that extends behind the planet. Eventually, the magnetotail stretches so much that its formerly mostly-parallel magnetic field lines snap and reconnect, sending some field lines flying off behind the planet and others back toward it.

"The magnetic field lines sort of break and form new ones," says space physicist Ryan Dewey of the University of Michigan in Ann Arbor, who was not involved in the study. "And in that process, a lot of energy is released."

All that energy sends packets of electrons flying planetward, spiraling in corkscrew-like trajectories along magnetic field lines. When these electrons hit the planet or its atmosphere, they release energy as light.

The light's wavelength depends on what the electrons encounter as they rain down. Earth's auroras shine in visible wavelengths because incoming electrons excite molecules of uncharged gases in the atmosphere like oxygen and nitrogen, which release visible light when they relax back to their normal states. Mercury's auroras shine in X-ray wavelengths because electrons decelerate as they smack the planet's rocky surface. The lost energy is released as X-rays.

To Dewey, the new discovery is a tantalizing sneak peek at the discoveries waiting to be made at Mercury once BepiColombo enters orbit in 2025. By then, it will have been a decade since scientists last had a probe continuously orbiting Mercury.

Journal Reference:
Richard D. Starr, David Schriver, Larry R. Nittler, et al., MESSENGER detection of electron-induced X-ray fluorescence from Mercury's surface, JGR Planets, 2023. DOI: https://doi.org/10.1029/2012JE004118


Original Submission

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