The three dimensional foreshock and the response of the terrestrial foreshock to rapid changes in interplanetary magnetic field orientation: Cluster observations

Details The three dimensional foreshock and the response of the terrestrial foreshock to rapid changes in interplanetary magnetic field orientation: Cluster observations The three dimensional foreshock and the response of the terrestrial foreshock to rapid changes in interplanetary magnetic field orientation: Cluster observations

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusmsm43b..02e&link_type=abstract

American Geophysical Union, Spring Meeting 2004, abstract #SM43B-02

Physics

2154 Planetary Bow Shocks, 2159 Plasma Waves And Turbulence, 7851 Shock Waves, 7867 Wave/Particle Interactions

Scientific paper

Cluster observations of ULF wave activity in the terrestrial foreshock are presented, focusing on intervals when the orientation of the upstream magnetic field was not stable. The location of the foreshock in front of the bow shock depends on the orientation of the upstream magnetic field, since this defines the region of space accessible to backstreaming plasma distributions. Whilst the structure of the foreshock for a particular magnetic field orientation may be calculated, the way in which the foreshock morphology responds experimentally to changes in magnetic field orientation, and the timescale on which it responds, remains of interest. Measurements of ULF wave activity made by Cluster FGM at large (1Re) spacecraft separations are used to examine how the foreshock responds to different changes in upstream magnetic field orientation. Also considered is fact that in general, the shock normal, the magnetic field vector and the solar wind vector are not coplanar. The polar orbit of Cluster allows measurements to be made at a series of latitudes, thus allowing an image of the three dimensional foreshock to be constructed.

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