Physics – Plasma Physics
Scientific paper
Sep 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11500i03z&link_type=abstract
Journal of Geophysical Research, Volume 115, Issue A8, CiteID A00I03
Physics
Plasma Physics
10
Magnetospheric Physics: Substorms, Space Plasma Physics: Charged Particle Motion And Acceleration, Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Plasma Sheet, Magnetospheric Physics: Numerical Modeling
Scientific paper
We report on the evolving ion distributions associated with the arrival of an earthward propagating dipolarization front in the near-Earth magnetotail using Time History of Events and Macroscale Interactions during Substorms (THEMIS). Ion distributions exhibit steady duskward anisotropy well before the front arrival, suggesting thin current sheet formation at ˜11 RE, during the growth phase of a moderate geomagnetic substorm. As the dipolarization front moves closer, an additional, earthward streaming ion population appears, resulting in an earthward velocity moment. This population eventually overwhelms the preexisting duskward anisotropy and merges with the earthward convecting bulk flow once the dipolarization front arrives. Test-particle simulations show that the observed ion evolution is consistent with a picture of ions reflected and accelerated by the approaching front and moving ahead of it.
Angelopoulos Vassilis
Runov Andrei
Sergeev Aleksandre V.
Zhou Zeng-Xiang
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