Issue |
A&A
Volume 693, January 2025
|
|
---|---|---|
Article Number | A78 | |
Number of page(s) | 6 | |
Section | Planets, planetary systems, and small bodies | |
DOI | https://doi.org/10.1051/0004-6361/202451322 | |
Published online | 03 January 2025 |
Observation of discontinuities accompanied by interplanetary shock within the Martian magnetosheath
1
Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University,
Beijing
102206,
PR
China
2
Planetary and Space Physics Group, School of Physics and Astronomy, Beijing Normal University,
Beijing
100875,
PR
China
★★ Corresponding author; jpguo@bnu.edu.cn; guojpguo@gmail.com
Received:
1
July
2024
Accepted:
2
December
2024
As fast forward interplanetary (IP) shocks travel outward in the IP medium, they might encounter planetary bow shocks (BSs) and then propagate into the magnetosheath. The interaction of an IP shock with a BS could create a new discontinuity, which has been predicted by theory and simulations, and commonly observed at Earth. Nevertheless, it is still uncertain whether such a phenomenon occurs at unmagnetized planets like Mars. Here, we present the first experimental observation of a discontinuity-like structure that follows a transmitted IP shock within the Martian magnetosheath. This event was recorded by the MAVEN spacecraft on March 3, 2015. The comparison of spacecraft measurements with theoretical studies indicates that the discontinuity-like structure is a compound structure in nature, composed of the slow expansion wave, contact discontinuity, and slow shock, launched by the interaction of a fast IP shock with the Martian BS. The results shed light on the similarities between magnetized and unmagnetized planets in response to the passage of IP shocks.
Key words: plasmas / methods: observational / planets and satellites: individual: Mars
© The Authors 2025
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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