Initial POLAR MFE observation of substorm signatures in the polar magnetosphere

Details Initial POLAR MFE observation of substorm signatures in the polar magnetosphere Initial POLAR MFE observation of substorm signatures in the polar magnetosphere

Jun 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.1459k&link_type=abstract

Geophysical Research Letters, Volume 24, Issue 12, p. 1459-1462

Physics

3

Magnetospheric Physics: Storms And Substorms, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions

Scientific paper

This paper studies substorm influences in the polar magnetosphere using data from the POLAR magnetic field experiment (MFE). The POLAR spacecraft remains in the high altitude polar magnetosphere for extended periods around apogee. There it can stay at nearly constant altitude through all phases of a substorm, which was not possible on previous missions. We report such an event on March 28, 1996. Ground magnetometers monitored substorm activity, while the POLAR spacecraft, directly over the pole at (-0.8,-0.6,8.5)RE in GSM coordinates, observed a corresponding perturbation in the total magnetic field strength. The total magnetic field first increased, then recovered toward quiet levels, consistent with erosion of magnetic flux from the dayside magnetosphere, followed by transport of that flux to the magnetotail, and eventual onset of tail reconnection and the return of that magnetic flux to the dayside magnetosphere.

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