Asymmetric access and temporal variations of energetic solar protons at the polar caps

Details Asymmetric access and temporal variations of energetic solar protons at the polar caps Asymmetric access and temporal variations of energetic solar protons at the polar caps

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.5397i&link_type=abstract

Journal of Geophysical Research, vol. 86, July 1, 1981, p. 5397-5407.

Physics

2

Energetic Particles, Interplanetary Magnetic Fields, Magnetospheric Proton Density, Polar Caps, Solar Protons, Solar Terrestrial Interactions, Anisotropy, Geomagnetic Micropulsations, Geomagnetism, Magnetic Field Configurations, Magnetohydrodynamic Waves, Ogo-6, Periodic Variations, Proton Flux Density, Solar Flares

Scientific paper

Data from the low-altitude polar orbiting satellite OGO 6 showed that the north/south ratio of the intensity of solar protons (energies greater than 50 Mev) over the earth's north polar cap (north latitude greater than 70 deg) to that over its south polar cap (south latitude greater than 70 deg) was about 1.61 + or - 0.04 for the solar particle event of November 2, 1969, and 1.00 + or - 0.03 for the event of December 18, 1969, while the ratio was 0.64 + or - 0.02 for the solar particle event of December 19, 1969. These results, considered together with the interplanetary magnetic field polarities and the interplanetary proton anisotropies, favor the open model of the magnetosphere. The data also showed a clear evidence of periodic temporal variations of the proton flux over the polar caps; the pulsation effects had frequencies in the same range as the Pc4 and Pc5 geomagnetic micropulsations and were attributed to magnetohydromagnetic waves.

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