Article (Scientific journals)
The structure and variability of Mars dayside thermosphere from MAVEN NGIMS and IUVS measurements: Seasonal and solar activity trends in scale heights and temperatures
Bougher, Stephen W.; Roeten, K. J.; Olsen, K. et al.
2017In Journal of Geophysical Research. Space Physics
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Keywords :
Dayglow; Dayside; Mars; MAVEN; Temperatures; Thermosphere
Abstract :
[en] 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°) 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 9.4 km). Between these two seasonal extremes, the temperature decreased by ∼70 K (from 240 to 170 K). These 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 agreement. © 2017. American Geophysical Union. All Rights Reserved.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Bougher, Stephen W.;  Climate and Space Sciences and Engineering Department University of Michigan Ann Arbor, Michigan USA
Roeten, K. J.;  Climate and Space Sciences and Engineering Department University of Michigan Ann Arbor, Michigan USA
Olsen, K.;  Climate and Space Sciences and Engineering Department University of Michigan Ann Arbor, Michigan USA
Mahaffy, P. R.;  Planetary Environments Laboratory Greenbelt, Maryland USA
Benna, M.;  Planetary Environments Laboratory Greenbelt, Maryland USA, CRESST University of Maryland, Baltimore County Baltimore, Maryland USA
Elrod, M.;  Planetary Environments Laboratory Greenbelt, Maryland USA, CRESST University of Maryland College Park, Maryland USA
Jain, S. K.;  Laboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder, Colorado USA
Schneider, N. M.;  Laboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder, Colorado USA
Deighan, J.;  Laboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder, Colorado USA
Thiemann, E.;  Laboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder, Colorado USA
Eparvier, F. G.;  Laboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder, Colorado USA
Stiepen, Arnaud ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Jakosky, Bruce M.;  Laboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder, Colorado USA
More authors (3 more) Less
Language :
English
Title :
The structure and variability of Mars dayside thermosphere from MAVEN NGIMS and IUVS measurements: Seasonal and solar activity trends in scale heights and temperatures
Publication date :
2017
Journal title :
Journal of Geophysical Research. Space Physics
ISSN :
2169-9380
eISSN :
2169-9402
Publisher :
Blackwell Publishing Ltd
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 15 May 2017

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