Effect of a northward turning of the interplanetary magnetic field on cusp precipitation as observed by Cluster

Details Effect of a northward turning of the interplanetary magnetic field on cusp precipitation as observed by Cluster Effect of a northward turning of the interplanetary magnetic field on cusp precipitation as observed by Cluster

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jgra..11307s13e&link_type=abstract

Journal of Geophysical Research, Volume 113, Issue A7, CiteID A07S13

Physics

7

Magnetospheric Physics: Cusp, Magnetospheric Physics: Magnetic Reconnection (7526, 7835), Magnetospheric Physics: Magnetopause And Boundary Layers, Magnetospheric Physics: Auroral Phenomena (2407)

Scientific paper

The immediate effect of the rotation of the interplanetary magnetic field (IMF) from southward to northward on cusp precipitation has been rarely observed by a polar orbiting satellite in the past. The four Cluster spacecraft observed such an event on 23 September 2004 as they were crossing the polar cusp within 2-16 min from each other. Between the first three and the last spacecraft crossing the cusp, the IMF rotated from southward to northward with a dominant By (GSM) component. For the first time we can examine the changes in the particle precipitation immediately after such IMF change. The first two spacecraft observed typical IMF-southward ion dispersion, while the last one observed both an IMF-southward-like dispersion in the boundary layer and an IMF-northward dispersion in the cusp. After the IMF turning, the cusp is shown to have grown in size in both the poleward and equatorward directions. A three-dimensional magnetohydrodynamic simulation is used to determine the locations of the sources of the ions and the topology of the magnetic field during the event.

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