Diagnosing the plasmapause with a network of closely spaced ground-based magnetometers

Details Diagnosing the plasmapause with a network of closely spaced ground-based magnetometers Diagnosing the plasmapause with a network of closely spaced ground-based magnetometers

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28..115m&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 1, p. 115-118

Physics

10

Magnetospheric Physics, Magnetospheric Physics: Magnetosphere-Inner, Magnetospheric Physics: Plasmasphere

Scientific paper

Using cross-phase analysis on data from the closely spaced magnetometers of the BEAR array, we have obtained meridional frequency-latitude profiles of field line resonances (FLRs) from the inner plasmasphere, across the plasmapause and into the plasmatrough. The location of the plasmapause is indicated by the discontinuity in the frequency-latitude profile and is confirmed by a Kp-dependent model plasmapause position. We show that the cross-phase response from stations separated by <0.5 L is inhibited when the plasmapause is overhead. We are thus able to track the motion of the plasmapause polewards during the day by plotting the time development of the cross-phase spectra as a function of latitude. In addition we observe anomalous frequency values obtained from more widely separated station pairs (>1 L) spanning the plasmapause leading us to conclude that caution must be exercised when interpreting the cross-phase response from pairs of stations at mid-latitudes.

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