期刊
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
卷 126, 期 10, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2021JA029428
关键词
aurora; magnetic fields; Mars; space weather
资金
- NASA
- BELSPO
- ESA PRODEX Office (PEA) [4000103401, 4000121493]
- University of Colorado
- NASA's Goddard Space Flight Center
MAVEN's Imaging Ultraviolet Spectrograph has identified 278 discrete aurora events on Mars, with the brightest and most frequent occurrences located around strong crustal fields in the southern hemisphere. These events primarily occur in the evening and are influenced by favorable orientations of the interplanetary magnetic field, lasting for hours each night and potentially visible to future astronauts.
Mars Atmosphere and Volatile Evolution (MAVEN)'s Imaging Ultraviolet Spectrograph has identified 278 occurrences of discrete aurora events on Mars, which are patchy, sporadic ultraviolet emissions emanating from the upper atmosphere. We confirm prior results finding that emissions are highly correlated with crustal magnetic fields results, with the brightest and most frequent occurrences located around strong crustal fields in the southern hemisphere. The six-year data set shows that events can also occur globally, in regions of weak or absent crustal fields. We find that events occur primarily in evening hours, especially during favorable orientations of the interplanetary magnetic field. Under these conditions, auroral events probably occur nightly and last for hours. Optical counterparts to these UV emissions would probably be detectable with present-day instrumentation, and would be visible to future astronauts.
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