Dynamic response of the Martian ionosphere to an interplanetary shock: Mars Express and MAVEN observations

作者：Harada Y^*; Gurnett D A; Kopf A J; Halekas J S; Ruhunusiri S; Lee C O; Hara T; Espley J; DiBraccio G A; Mitchell D L; Mazelle C; Larson D E; Jakosky B M

来源：Geophysical Research Letters, 2017, 44(18): 9116-9123.

DOI：10.1002/2017GL074897

• Mars
• ionosphere
• space weather

Multipoint observations from the Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) instrument on board Mars Express and the Mars Atmosphere and Volatile EvolutioN (MAVEN) mission reveal a dynamic response of the Martian ionosphere to abrupt variations in the upstream solar wind plasma. On 2 February 2017, MAVEN, located upstream from the Martian bow shock, encountered a corotating interaction region-related interplanetary shock with a sudden enhancement in the dynamic pressure. MARSIS, operating in the upper ionosphere at similar to 478km altitudes and similar to 78 degrees solar zenith angles, observed a sharp increase in the local magnetic field magnitude similar to 1 min after the shock passage at MAVEN. The time lag is roughly consistent with the expected propagation time of a pressure pulse from the bow shock to the upper ionosphere at the fast magnetosonic speed. Subsequently, remote soundings recorded disturbed signatures of the topside ionosphere below Mars Express.

• 出版日期2017-9-28