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- W4317502071 abstract "Abstract We present temperature maps derived from number density retrievals of carbon dioxide (CO 2 ) for the upper mesosphere and lower thermosphere of Mars using limb observations from the Imaging Ultraviolet Spectrograph (IUVS) aboard NASA's Mars Atmosphere and Volatile EvolutioN (MAVEN) spacecraft. We retrieve CO 2 densities using O( 1 S) metastable atoms that radiatively relax by emitting photons at 297.2 nm, producing a double‐peaked emission profile detectable by IUVS. Retrieved CO 2 densities are used to derive altitude profiles of temperature as a function of latitude, longitude, local time, season, dust activity, and solar activity. CO 2 density and temperature profiles retrieved using the O I 297.2 nm emission feature presented herein extend previous IUVS retrievals from 130–170 km down to 80 km. We validate retrieved CO 2 densities and derived temperatures using coincident measurements and corresponding data products produced by MAVEN IUVS, as available. Analysis of this comprehensive data set, which spans Mars years 32–36, shows (a) a consistently well‐defined mesopause at approximately 120 km, (b) warming at high pressures (typically below ∼100 km) for a variety of geophysical conditions, (c) asymmetry in temperatures at dawn and dusk with respect to latitude during different seasons (warmer temperatures at dawn during northern hemisphere autumn/winter and cooler temperatures at dusk during spring/summer), and (d) longitudinal waves with a dominant wave‐3 component in both the upper mesosphere and lower thermosphere, with lower (80–90 km) and upper (135–145 km) atmospheric waves about 65° out of phase." @default.
- W4317502071 created "2023-01-20" @default.
- W4317502071 creator A5006818945 @default.
- W4317502071 creator A5007403695 @default.
- W4317502071 creator A5008373729 @default.
- W4317502071 creator A5014924663 @default.
- W4317502071 creator A5025032789 @default.
- W4317502071 creator A5026498430 @default.
- W4317502071 creator A5028012630 @default.
- W4317502071 creator A5049756748 @default.
- W4317502071 creator A5070110695 @default.
- W4317502071 creator A5073606676 @default.
- W4317502071 date "2023-02-01" @default.
- W4317502071 modified "2023-09-30" @default.
- W4317502071 title "Dayside Temperature Maps of the Upper Mesosphere and Lower Thermosphere of Mars Retrieved From MAVEN IUVS Observations of O I 297.2 nm Emission" @default.
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