Notes from the Field

More Fun Than a BARREL of Electrons

December 31st, 2019 by Andy Hynous

I realize that, you know, its New Year’s and all.  But while everyone is waiting for that big ball to drop in Times Square, here outside McMurdo, we’ve been working to send balloons UP! We just had a super successful launch of a 0.6 million cubic foot (MCF) balloon. Now, for us at in the Balloon Program Office, that’s a pretty small balloon; we generally launch balloons that are anywhere from 4 to 39 MCF. But the 0.6 MCF platform gives us a capability to support a whole lot of scientists that have small and very sensitive instruments with the ability to go where only we can take them. Up above you can see how these small balloons look just prior to launch. 

This flight really supported two missions for us. First of all, the instrument that we launched on the balloon was a part of a program ran by Dr. Robyn Millan at Dartmouth College. Robyn and her team are using the BARREL instrument to study electron losses from the Van Allen Radiation Belts. The instrument is able to capture when electrons literally fall out of the sky and measure their energy. One of the big things that their work will help everyone with is how to better protect satellites from the radiation in space. 

The second thing we want from this launch is for the balloon to be a pathfinder for a future NASA Explorers Program mission. We will use the trajectory that this flight follows, a similar flight from last year, and another follow on flight scheduled for next year to help bound the expected flight path for the future GUSTO mission.  GUSTO will be studying emissions from the particles that are in interstellar (between the stars) space and help shed light on the lifecycle of stars in our galaxy.

Now, I realize that 0.6 MCF is a pretty abstract number, so for those of you (like me) that think in real dimensions I wanted to give you an idea of just how “small” these balloons really are. When fully inflated, the 0.6 MCF balloon is 72.5 feet by 124.5 feet (yes, I said feet), and it quite frankly looks like a pumpkin! So if you take your average pumpkin from October and make it 55 times bigger then you have a 0.6 MCF balloon. Easy, right?  Another way to visualize it is if you took three full sized school buses and put them end to end, then that’d be the diameter of this balloon. Sounds pretty small to me.

I also want to circle back to that “pumpkin” shape I mentioned earlier.  Another thing that made this launch super was that this was a Super Pressure Balloon.  This design of balloon actually maintains constant pressure during its entire flight (just like a party balloon), and that gives us very good altitude stability during day and night transitions and long flight durations. Our record from last year’s Antarctic campaign was 73 days. 

My picture today is of the BARREL instrument at the foot of our flight line with Mt. Erebus in the background. And if you look behind BARREL, the red plastic on the ground is our balloon in its covering that protects it while we lay it out prior to launch. Thanks again for checking out my Notes from the Field: Balloons for Science blog.  And most importantly, have a happy New Year!

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