Plasmapause undulation of 17 April 2002

Details Plasmapause undulation of 17 April 2002 Plasmapause undulation of 17 April 2002

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3115801g&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 15, CiteID L15801

Physics

9

Magnetospheric Physics: Electric Fields (2411), Magnetospheric Physics: Plasmasphere, Magnetospheric Physics: Storms And Substorms

Scientific paper

We report IMAGE EUV observations of a striking undulatory motion of the plasmapause that occurred on 17 April 2002, in which a large ripple propagated westward across the duskside plasmapause. From the plasmapause motion we infer a peak E-field of ~3 mV/m associated with the undulation, and estimate the undulation's equatorial azimuthal speed to be 0.9 rad/hr ~ 4 RE/hr, corresponding to ~1 km/s in the ionosphere (using an R3/2 dependence to map from the equator). Because DMSP ion drift data at 850 km altitude show the presence of a subauroral polarization stream (SAPS) flow channel ~1 km/s at the same location and time as the undulation, we assert that SAPS was responsible for removal of plasma during the undulation. The SAPS apparently formed in response to a 19:00 UT substorm onset.

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