Dynamic response of the Martian ionosphere to an interplanetary shock: Mars Express and MAVEN observations - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Geophysical Research Letters Year : 2017

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

Y. Harada
  • Function : Author
D. A. Gurnett
  • Function : Author
A. J. Kopf
  • Function : Author
J. S. Halekas
  • Function : Author
S. Ruhunusiri
  • Function : Author
C. O. Lee
  • Function : Author
T. Hara
  • Function : Author
J. Espley
  • Function : Author
G. A. Dibraccio
  • Function : Author
D. L. Mitchell
  • Function : Author
D. E. Larson
  • Function : Author
B. M. Jakosky
  • Function : Author

Abstract

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 ∼478 km altitudes and ∼78° solar zenith angles, observed a sharp increase in the local magnetic field magnitude ∼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.
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insu-03676955 , version 1 (24-05-2022)

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Y. Harada, D. A. Gurnett, A. J. Kopf, J. S. Halekas, S. Ruhunusiri, et al.. Dynamic response of the Martian ionosphere to an interplanetary shock: Mars Express and MAVEN observations. Geophysical Research Letters, 2017, 44, pp.9116-9123. ⟨10.1002/2017GL074897⟩. ⟨insu-03676955⟩
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