Wave Structures Within Sub-Auroral Polarization Streams during the November 6, 2001 magnetic storm

Details Wave Structures Within Sub-Auroral Polarization Streams during the November 6, 2001 magnetic storm Wave Structures Within Sub-Auroral Polarization Streams during the November 6, 2001 magnetic storm

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm22a0560m&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM22A-0560

Physics

2712 Electric Fields (2411), 2740 Magnetospheric Configuration And Dynamics, 2752 Mhd Waves And Instabilities, 2778 Ring Current

Scientific paper

Intense wave structures observed by the DMSP F15 satellite at mid-latitudes during the magnetic storm on November 6, 2001 are reported. These structures are found inside the so-called Sub-Auroral Polarization Streams, i.e., a strongly-enhanced, localized westward convection flow inside the density trough. Electric (magnetic) field variations in the wave structures amount to 70 mV/m (20 nT). Relative plasma density variations reach up to 20%. Precipitations of energetic (30 keV) protons accompany particularly strong structures. A detailed exposition of measurements acquired during one of the SAPS crossing illustrates the quasi-dc circuit and embedded small-scale plasma and fields irregularities. Our analysis demonstrates that the irregularities often have nearly monochromatic frequency spectra. Both quasi-electrostatic and electromagnetic wave structures can coexist in close physics proximity. At times the Poynting flux carried by the electromagnetic waves was directed away from the ionosphere. Possible wave-generation mechanisms and their roles in ring current-plasmasphere-ionosphere interaction are discussed. We suggest that some of these structures are due to Alfv{é}n waves produced in a positive feedback interaction between the nightside sub-auroral ionosphere and the equatorial magnetosphere in agreement with the numerical modeling results.

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