Journal articles
The structure and variability of Mars upper atmosphere as seen in MAVEN/IUVS dayglow observations
Abstract : We report a comprehensive study of Mars dayglow observations focusing on upper atmospheric structure and seasonal variability. We analyzed 744 vertical brightness profiles comprised of ∼109,300 spectra obtained with the Imaging Ultraviolet Spectrograph (IUVS) aboard the Mars Atmosphere and Volatile EvolutioN (MAVEN) satellite. The dayglow emission spectra show features similar to previous UV measurements at Mars. We find a significant drop in thermospheric scale height and temperature between LS = 218° and LS = 337–352°, attributed primarily to the decrease in solar activity and increase in heliocentric distance. We report the detection of a second, low-altitude peak in the emission profile of OI 297.2 nm, confirmation of the prediction that the absorption of solar Lyman alpha emission is an important energy source there. The inline image UV doublet peak intensity is well correlated with simultaneous observations of solar 17–22 nm irradiance at Mars.
Cited literature [27 references]
https://hal-insu.archives-ouvertes.fr/insu-01238335
Contributor : Catherine Cardon <>
Submitted on : Wednesday, August 5, 2020 - 11:37:23 AM
Last modification on : Saturday, December 12, 2020 - 12:10:06 PM
Long-term archiving on: : Monday, November 30, 2020 - 2:44:19 PM
Contributor : Catherine Cardon <>
Submitted on : Wednesday, August 5, 2020 - 11:37:23 AM
Last modification on : Saturday, December 12, 2020 - 12:10:06 PM
Long-term archiving on: : Monday, November 30, 2020 - 2:44:19 PM
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2015GL065419.pdf
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