Temporal variability of lunar exospheric helium during January 2012 from LRO/LAMP
["Feldman, Paul D","Hurley, Dana M","Retherford, Kurt D","Gladstone, G. Randall","Stern, S. Alan","Pryor, Wayne","Parker, Joel Wm","Kaufmann, David E","Davis, Michael W","Versteeg, Maarten H"]
2012-11-01
期刊论文
(2)
We report observations of the lunar helium exosphere made between December 29, 2011, and January 26, 2012, with the Lyman Alpha Mapping Project (LAMP) ultraviolet spectrograph on NASA's Lunar Reconnaissance Orbiter Mission (LRO). The observations were made of resonantly scattered He I 2584 from illuminated atmosphere against the dark lunar surface on the dawn side of the terminator. We find no or little variation of the derived surface He density with latitude but day-to-day variations that likely reflect variations in the solar wind alpha flux. The five-day passage of the Moon through the Earth's magnetotail results in a factor of two decrease in surface density, which is well explained by model simulations. (C) 2012 Elsevier Inc. All rights reserved.
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