The structure and variability of Mars dayside thermosphere from MAVEN NGIMS and IUVS measurements: Seasonal and solar activity trends in scale heights and temperatures

被引：113

作者：

Bougher, Stephen W. ^{[1
]}

Roeten, Kali J. ^{[1
]}

Olsen, Kirk ^{[1
]}

Mahaffy, Paul R. ^{[2
]}

Benna, Mehdi ^{[2
,3
]}

Elrod, Meredith ^{[2
,4
]}

Jain, Sonal K. ^{[5
]}

Schneider, Nicholas M. ^{[5
]}

Deighan, Justin ^{[5
]}

Thiemann, Ed ^{[5
]}

Eparvier, Francis G. ^{[5
]}

Stiepen, Arnaud ^{[6
]}

Jakosky, Bruce M. ^{[5
]}

机构：

[1] Univ Michigan, Climate & Space Sci & Engn Dept, Ann Arbor, MI 48109 USA

[2] Planetary Environm Lab, Greenbelt, MD USA

[3] Univ Maryland Baltimore Cty, CRESST, Baltimore, MD 21228 USA

[4] Univ Maryland, CRESST, College Pk, MD 20742 USA

[5] Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA

[6] Univ Liege, Space Sci Technol & Astrophys Res Inst, Lab Phys Atmospher & Planetaire, Liege, Belgium

来源：

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS | 2017年 / 122卷 / 01期

关键词：

GENERAL-CIRCULATION MODELS; UPPER-ATMOSPHERE; MARTIAN ATMOSPHERE; DAYGLOW; EXPRESS;

D O I：

10.1002/2016JA023454

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Mars dayside thermospheric temperature and scale height trends were examined using measurements from the Neutral Gas Ion Mass Spectrometer (NGIMS) and the Imaging Ultraviolet Spectrograph (IUVS) on the Mars Atmosphere Volatile EvolutioN (MAVEN) spacecraft. Average scale heights (over 150-180 km for solar zenith angles <= 75 degrees) from several different sampling periods were obtained from each instrument. NGIMS and IUVS scale height trends were found to be in good agreement, with both showing scale heights decreasing after perihelion and reaching a low value near aphelion (13.6 to 9.4km). Between these two seasonal extremes, the temperature decreased by similar to 70K (from 240 to 170K). Tese trends were also analyzed with respect to the changing solar flux reaching the planet, using the Lyman alpha irradiance measured by the Extreme Ultraviolet Monitor (EUVM) on MAVEN. Scale heights responded strongly to the changing solar flux. During this part of the MAVEN mission (October 2014 to May 2016), it was concluded that over longer timescales (at least several months), dayside thermospheric temperatures are chiefly driven by changing solar forcing, although it is the effects of changing heliocentric distance rather than changing solar activity which seem to have the greatest impact. Furthermore, effects of solar forcing were not observed on shorter timescales (less than a month), suggesting local wave effects may dominate solar forcing on these timescales. Finally, temperatures from two NGIMS sampling periods were compared to temperatures from the Mars Global Ionosphere-Thermosphere Model (M-GITM) and found to be in good agreemen

引用

页码：1296 / 1313

页数：18

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