Response of the mid-altitude cusp to rapid rotations of the IMF

Details Response of the mid-altitude cusp to rapid rotations of the IMF Response of the mid-altitude cusp to rapid rotations of the IMF

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3311107p&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 11, CiteID L11107

Physics

9

Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Magnetospheric Physics: Magnetospheric Configuration And Dynamics, Magnetospheric Physics: Cusp

Scientific paper

On 12 August 2003, the four Cluster spacecraft crossed the mid-altitude cusp one after the other a minute or two apart. Shortly after the cusp crossing, two of the Cluster observed three structures poleward of the cusp that appeared and grew in successive satellite passes. In these structures, high fluxes of low-energy magnetosheath-like ions and electrons are observed. The analysis of particle and magnetic field data reveals that it is the cusp region that moved back and forth over the spacecraft. We show that the cusp reacts extremely fast to rotations of the interplanetary magnetic field (IMF) and that each of the three northward turnings of the IMF is accompanied by a poleward displacement of the cusp. The latitudinal component of the cusp velocity at ~5 Re altitude is estimated to be of the order of 30 km/s.

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