Access of solar electrons to the polar regions

Details Access of solar electrons to the polar regions Access of solar electrons to the polar regions

Jun 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975p%26ss...23..945n&link_type=abstract

Planetary and Space Science, vol. 23, June 1975, p. 945-954. NASA-supported research.

Computer Science

Electron Flux Density, Geomagnetism, Interplanetary Magnetic Fields, Magnetopause, Polar Caps, Solar Electrons, Magnetosheath, Magnetospheric Electron Density, Ogo-5, Satellite Observation, Solar Protons, Solar Wind

Scientific paper

Riometric and forward-scatter radio-wave absorption measurements at high polar latitudes in both hemispheres are compared with absorption calculations based on satellite observations in the magnetosheath to determine whether a north-south asymmetry in the solar electron flux occurred during a polar-cap absorption (PCA) event. Detection of solar electrons in interplanetary space is shown to have occurred simultaneously with detection of HF radio-wave absorption, indicating that the initial stage of the PCA was due to the arrival of solar electrons. A north-south asymmetry is observed in the electron flux, and it is found that the flux precipitating over the South Pole did not exceed the mean unidirectional intensity of the electrons detected in space. The ratio between fluxes in the low and high polar latitude regions over Antarctica during a period of solar electron anisotropy is found to be comparable with that obtained during periods of isotropy. These results are shown to be consistent with the idea of an open magnetosphere and with the conclusion that an anisotropic solar electron flux may be rendered isotropic at the magnetopause.

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