[S19-P] Poster

[S19-P-02] Estimation and detection of Mars' background free oscillations for InSIGHT mission

^○Yasuhiro Nishikawa^{1, 4}, Philippe Lognonne¹, Taichi Kawamura², Aymeric Spiga³, Tanguy Bertrand³, Kei Kurita⁴ (1.Institut de physique du globe de Paris., 2.National Astronomical Observatory of Japan, 3.Laboratoire de Meterologie Dynamique (UPMC/CNRS), 4.Earthquake Research Institute, The University of Tokyo)

Seismic observation is a powerful tool to investigate its internal structure. The excitations of the seismic activities have been described and developed in many papers. One of the excitations is martian atmosphere. The martian atmosphere varies day by day and time by time. The pressure perturbations and wind can be seismic excitations like on Earth. The continuous excitations be enables to excite Mars' background free oscillations (MBFs). The MBFs have specific frequencies which are function of seismic properties of internal structure of Mars. The MBFs observation enables us to estimate 1D internal structure of Mars. The excitations are distributed everywhere in the martian atmosphere. It is difficult to observe whole martian climate. To solve the difficulty, we use General Circular Model (GCM). GCM can predict and reproduct long period global martian climate. The concept of the paper is to calculate MBFs using by GCMs and describe possibility of the martian hum detection. By the calculations we got minimum estimation of MBF amplitude. The amplitude is about nano gals and the martian hum can be observed by SEIS seismometer.