Polar cap x-ray and electrons under low density solar wind conditions: Coordinated PIXIE and DMSP observations on 11 May 1999

Details Polar cap x-ray and electrons under low density solar wind conditions: Coordinated PIXIE and DMSP observations on 11 May 1999 Polar cap x-ray and electrons under low density solar wind conditions: Coordinated PIXIE and DMSP observations on 11 May 1999

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.4021a&link_type=abstract

Geophysical Research Letters, Volume 27, Issue 24, p. 4021-4024

Physics

3

Ionosphere: Polar Cap Ionosphere, Magnetospheric Physics: Energetic Particles, Precipitating, Magnetospheric Physics: Polar Cap Phenomena, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions

Scientific paper

X-ray images from 11 May 1999 typically show emissions filling a region above about 75°-80° magnetic latitude with the emitting region centered a few degrees toward mid-morning from the magnetic pole during a period when the solar wind reached unusually low values. Ionospheric particle measurements show the entire northern polar cap illuminated by precipitating electrons during much of this time, while the southern polar cap was mostly ``dark.'' The precipitating electrons had multicomponent spectra, one component with characteristic energy ~200 eV throughout the observation period, and others with time-varying characteristic energies ranging between ~3.5 keV and 10 keV, all components with spatial characteristics common to polar rain. Measurements in the solar wind also show similar multicomponent spectra and are relatively well correlated with observations of solar radio bursts and the polar-cap x-ray flux. We conclude that the higher energy components were associated with electrons accelerated in solar flares or coronal flare-like events.

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