[...] the tentative date for launch is now June 11th.
The experiment requires specific weather conditions. On the day of launch, a two-stage Terrier-Improved Malemute sounding rocket will carry ten canisters that will be deployed about five minutes after liftoff. The canisters will then create vividly colored artificial clouds aka [also known as] vapor tracers. NASA scientists will then visually track the subsequent particle motions to gain further understanding of the ionosphere.
—Gizmodo [gizmodo.com]