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Magnetic Reconnection on Dayside Crustal Magnetic Fields at Mars: MAVEN Observations

Abstract : The identification of magnetic reconnection on the dayside of Mars has been elusive owing to the lack of comprehensive plasma and field measurements. Here we present direct measurements of dayside in situ reconnection signatures by the comprehensive particles and fields package on board the Mars Atmosphere and Volatile EvolutioN (MAVEN) spacecraft over strong crustal magnetic fields in the southern hemisphere of Mars. During a crossing of a bifurcated current sheet consisting of northward and southward magnetic fields, MAVEN recorded (i) ionospheric photoelectrons trapped on closed magnetic field lines, (ii) Hall magnetic fields and a nonzero normal field with polarity consistent with a crossing northward of the X line, and (iii) northward Alfvénic ion jets. Dayside magnetic reconnection on crustal magnetic fields could control the global configuration and topology of the Martian magnetosphere and alter the ion escape pattern from the dayside ionosphere.
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Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Wednesday, May 25, 2022 - 1:18:59 PM
Last modification on : Wednesday, June 1, 2022 - 4:18:53 AM


Geophysical Research Letters -...
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y. Harada, J. S. Halekas, G. A. Dibraccio, S. Xu, J. Espley, et al.. Magnetic Reconnection on Dayside Crustal Magnetic Fields at Mars: MAVEN Observations. Geophysical Research Letters, 2018, 45, pp.4550-4558. ⟨10.1002/2018GL077281⟩. ⟨insu-03678218⟩



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