THEMIS observations of a hot flow anomaly: Solar wind, magnetosheath, and ground-based measurements

Details THEMIS observations of a hot flow anomaly: Solar wind, magnetosheath, and ground-based measurements THEMIS observations of a hot flow anomaly: Solar wind, magnetosheath, and ground-based measurements

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3517s03e&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 17, CiteID L17S03

Physics

Plasma Physics

12

Space Plasma Physics: Shock Waves (4455), Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Space Plasma Physics: Discontinuities (2109), Magnetospheric Physics: Magnetospheric Configuration And Dynamics

Scientific paper

The THEMIS spacecraft encountered a Hot Flow Anomaly (HFA) on the dusk flank of the Earth's bow shock on 4 July 2007, observing it on both sides of the shock. Meanwhile, the THEMIS ground magnetometers traced the progress of the associated Magnetic Impulse Event along the dawn flank of the magnetosphere, providing a unique opportunity to study the transmission of the HFA through the shock and the subsequent downstream response. THEMIS-A, in the solar wind, observed classic HFA signatures. Isotropic electron distributions inside the upstream HFA are attributed to the action of the electron firehose instability. THEMIS-E, just downstream, observed a much more complex disturbance with the pressure perturbation decoupled from the underlying discontinuity. Simple calculations show that the pressure perturbation would be capable of significantly changing the magnetopause location, which is confirmed by the ground-based observations.

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