Penetration of solar protons into the Earth's magnetosphere on November 22, 1977

Physics

Scientific paper

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Earth Magnetosphere, Radiation Spectra, Solar Cosmic Rays, Solar Flares, Solar Protons, Anisotropy, Cerenkov Counters, Radiation Measuring Instruments, Scintillation Counters, Solar Corpuscular Radiation

Scientific paper

The low polar-orbiting Cosmos-900 satellite carried a large geometric factor Cerenkov counter to study the particle anisotropy and spectrum near the proton increase peak in solar cosmic rays. The data help understand different temporal behavior of the increases detected at the stations because the whole set of data showed that the angular distribution of solar cosmic ray particles in interplanetary space was narrow throughout the observation time, resulting in a rapid variation of particle intensity near the poles. The power-law index of the solar cosmic ray integral spectrum varied from -2.4 to -5.2 in the 1 to 4 GV rigidity range from 10.31 to 11.25 UT on November 22, 1977. The flare-time data from all orbits indicate an increased radiation intensity on L=3.5 to 4.0.

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