JpGU-AGU Joint Meeting 2020

講演情報

[E] 口頭発表

セッション記号 P (宇宙惑星科学) » P-PS 惑星科学

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

コンビーナ:宮本 英昭(東京大学)、臼井 寛裕(東京工業大学地球生命研究所)、原田 裕己(京都大学理学研究科)、Sushil K Atreya(University of Michigan Ann Arbor)

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

*中川 広務1Jain Sonal2Schneider Nicholas2Montmessin Franck3Yelle Roger4Jiang Fayu4Verdier 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7Groller Hannes4Deighan 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.