[P-PS08] Mars and Mars system: results from a broad spectrum of Mars studies and aspects for future missions

[PPS08-03] A warm layer in the nightside mesosphere of Mars

*中川 広務¹、Jain Sonal²、Schneider Nicholas²、Montmessin Franck³、Yelle Roger⁴、Jiang Fayu⁴、Verdier Loic³、黒田 剛史¹、吉田 奈央¹、藤原 均⁵、今村 剛⁶、寺田 香織¹、寺田 直樹¹、関 華奈子⁷、Groller Hannes⁴、Deighan Justin² (1.東北大学　大学院理学研究科　地球物理学専攻太陽惑星空間物理学講座　惑星大気物理学分野、2.コロラド大学、3.LATMOS、4.アリゾナ大学、5.成蹊大学、6.東京大学 新領域創成科学研究科 、7.東京大学)

We report a new set of stellar occultation measurements for nightside temperature profiles made by the MAVEN/IUVS that provide evidence for a recurring layer of warm air between 70 - 90 km altitudes in the nightside mesosphere of Mars during Ls = 0º - 180º in Martian Year 33-34. The nightside profiles reveal a recurring peak of atmospheric temperature around 80 km over the equator to the middle latitudes in the northern hemisphere. The predictions of the Mars Climate Database have a warm layer with much smaller amplitudes. The observed peak amplitudes are larger than those predicted by the model by up to 90 K. Wavenumber-3 structures are seen in the warm layer that are potentially signatures of thermal tides or stationary planetary waves, with amplitudes two-times larger than predicted.