Observation 20-s periodic signals on Mars from InSight,Sols 800-1,000  

作　　者：HuiXing Bi DaoYuan Sun MingWei Dai 

机构地区：[1]Deep Space Exploration Laboratory/School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China [2]Laboratory of Seismology and Physics of Earth’s Interior,School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China [3]CAS Center for Excellence in Comparative Planetology,China,Hefei 230026,China

出　　处：《Earth and Planetary Physics》2023年第2期193-215,共23页地球与行星物理（英文版）

基　　金：supported by B-type Strategic Priority Program of the Chinese Academy of Sciences,Grant XDB41000000;National Natural Science Foundation of China 42241117.

摘　　要：Seismometers of the InSight probe(Interior Exploration using Seismic Investigation,Geodesy and Heat Transport)currently operating on Mars have recorded not only seismic events but also high-frequency non-seismic periodic signals that appear to have been induced by variations in the Martian environment and the hardware.Here,we report an observation of a long-period signal with a dominant period of~20 s from Martian solar days(Sol)800 to Sol 1,000.This 20-s signal is detected mostly at quiet nighttime—from22:00 to 04:00 LMST(Local Mean Solar Time)—at the InSight landing site.The measurement of the particle motion suggests that this linearly polarized signal focuses on the horizontal plane with an angle of~30°from the north.By examining the temporal variation of the signal’s amplitude and polarization angle and its times of occurrence in relation to the planet’s atmospheric data,we suggest that this20-s signal may be relevant to wind and temperature variations on Mars.Furthermore,we study the possible influence of this 20-s signal on the noise autocorrelation and find that the stacked autocorrelograms can be quite different when the 20-s signal is present.

关 键 词：MARS periodic signal particle motion AUTOCORRELATION 

分 类 号：P185.3[天文地球—天文学] V476.4[航空宇航科学与技术—飞行器设计]