Observations of effects from magnetospheric cusp movement during a solar proton event

Details Observations of effects from magnetospheric cusp movement during a solar proton event Observations of effects from magnetospheric cusp movement during a solar proton event

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.7557b&link_type=abstract

Journal of Geophysical Research, vol. 86, Sept. 1, 1981, p. 7557-7565. Research supported by the Forskningssekretariatet; Bunde

Computer Science

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Balloon Sounding, Earth Magnetosphere, Interplanetary Magnetic Fields, Proton Energy, Solar Activity Effects, Solar Protons, Atmospheric Conductivity, Electromagnetic Absorption, Energy Dissipation, Ionospheric Propagation, Polar Caps, Radiation Detectors, Riometers

Scientific paper

Observations of a magnetospheric cusp motion event during a solar proton event are presented. The observations were made by a series of riometers and balloon-borne radiation detectors and conductivity probes near Sondre Stromfjord, Greenland. During the arrival of solar protons on August 19, 1979, the balloon-borne detectors recorded two rises and declines in nuclear gamma ray intensity accompanied by a marked softening in the photon spectrum. The observations are interpreted as a shift in detector position from the dayside of the magnetosphere to the polar cap resulting from an equatorward displacement or expansion of the polar cusp by 5 deg in 15 min with a southward turning of the IMF. Instruments on ISEE 3 confirm this interpretation, showing a southward turning of the IMF and a solar wind speed increase. Results imply a proton cutoff energy in the range 6-10 MeV at Sondre Strombjord prior to the cusp motion, and reflect the early effects of field line erosion.

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