Time-history influence of global dust storms on the upper atmosphere at Mars

被引：19
|
作者：
Liemohn, Michael W. [1 ]
Dupre, Ava [1 ]
Bougher, Stephen W. [1 ]
Trantham, Matthew [1 ]
Mitchell, David L. [2 ]
Smith, Michael D. [3 ]
机构：
[1] Univ Michigan, Dept Atmospher Ocean & Space Sci, Ann Arbor, MI 48109 USA
[2] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA
[3] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
来源：
GEOPHYSICAL RESEARCH LETTERS | 2012年 / 39卷
基金：
美国国家科学基金会;
关键词：
THERMAL EMISSION SPECTROMETER; INTERANNUAL VARIABILITY; MAGNETIC-FIELD; ACCELEROMETER; THERMOSPHERE;
D O I：
10.1029/2012GL051994
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
A recent survey of the Mars Global Surveyor (MGS) electron data for dayside photoelectron observations over regions of strong crustal fields revealed an unusual bimodal solar flux dependence. The elevated-flux population was associated with the timing of a large global dust storm in late 2001. The results of a systematic study parameterizing the photoelectron flux intensities against a solar flux proxy and MGS-observed atmospheric dust opacity are presented here. Instantaneous dust opacities were used as well as time-history averages and maximal values. The result is a functional form for the photoelectron fluxes against these parameters. The inclusion of instantaneous dust opacity values in the function do not improve the correlation, but a time-history window significantly enhances the correlation and explains the bimodal distribution in the electron fluxes. The best relationship was obtained with 7-Earth-month time-history dust opacity variables included in the function. The most likely explanation for this long-lived influence of dust storms is a composition and/or density change in the upper atmosphere. Citation: Liemohn, M. W., A. Dupre, S. W. Bougher, M. Trantham, D. L. Mitchell, and M. D. Smith (2012), Time-history influence of global dust storms on the upper atmosphere at Mars, Geophys. Res. Lett., 39, L11201, doi:10.1029/2012GL051994.
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页数：6
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