On the Periodic Variation of the Ion Density in the Martian Dayside Ionosphere During the Regional Dust Storm in September 2016

Takuya Hara,Kei Masunaga,Naoki Terada,Shotaro Sakai, Taiga Osanai,Kanako Seki,Christopher M. Fowler,Kathleen Gwen Hanley,James P. McFadden,Shannon M. Curry

Journal of Geophysical Research Space Physics（2024）

Univ Calif Berkeley | Inst Space & Astronaut Sci | Tohoku Univ | Univ Tokyo | West Virginia Univ

Cited 0|Views33

Abstract

Dust storms and the atmospheric waves can play a significant role in the dynamics in the upper neutral atmosphere of Mars. Recent observations found that a periodic variation of neutral H and O exists in the upper atmosphere, which is likely associated with atmospheric waves that occurred during the regional dust storm on 4 September 2016. However, such periodic variations accompanying the dust storm are far from understood in terms of the Martian ionized particles (i.e., ionosphere). Here we investigated the periodic variation of the ion density in the Martian ionosphere during the regional dust storm in September 2016 based on the MAVEN/STATIC observations. Assuming a simple Chapman layer model, we implemented numerical fitting for the ion density altitude profile to retrieve the peak ion densities in the Martian ionosphere. We then applied periodogram analysis to these peak ion densities in order to identify the peak periodicities together with their confidence levels. We identified several distinct peak periodicities with a scale from similar to 1 day up to similar to 20 days. The peak periodicities around 6-9 days are comparable to those seen in the Martian neutral atmosphere. In addition, the other peak periodicities likely correspond to the periodic crossings of the local crustal fields and periodic variation of the upstream solar wind, indicating a strong regional coupling between the lower atmosphere and the upstream solar wind. We investigated periodic variations in the Martian dayside ionosphere during the regional dust storm We found several distinct peak periodicities in the Martian dayside ionosphere with a scale from similar to 1 day up to several weeks Periodic variation (6-9 days) in the Martian dayside ionosphere is likely comparable to those previously identified in the neutral H and O

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Key words

Mars,MAVEN,ionosphere,dust storm,atmospheric wave,periodogram

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