BARREL (Balloon Array for Radiation belt Relativistic Electron Losses) is a multiple-balloon investigation that will study Earth's Radiation Belts.
Atmospheric losses of relativistic electrons play an important role in radiation belt dynamics; precipitation into the atmosphere may even completely deplete the radiation belts in some cases.
BARREL is the first NASA Living With a Star Geospace Mission of Opportunity, and will support NASA's RBSP (Radiation Belt Storm Probes) mission.
It's been a pretty busy 36 hours down here since my last status update. SANAE launched Payload 1Q last night (20Jan at ~2030 UT), and then launched Payload 1R this evening (21Jan at 2030 UT). We also terminated two payloads today (1K at 0125 UT and 1D at 2200UT). Payload 1D had been up for 17 days and Payload 1K had been up for 16 days!! We'll likely terminate Payload 1I in another day or two. That brings us up to 14 payloads launched so far with about two weeks left in our launch window.
Geomagnetic activity has quieted down a bit and is expected to stay pretty quiet for the next few days. We have good launch weather at Halley for the next few days, but only have two payloads left. So, we'll be working with the SANAE folks to decide when to launch next.