Correlation of solar energetic protons and polar cap absorption

摘要: This study shows the results of a model polar cap absorption events (PCAs) using solar energetic proton flux as an input. The data are recorded by Charged Particle Measurement Experiment (CPME) on board IMP 8 satellite and collected Applied Physics Laboratory at Johns Hopkins University. orbits Earth distances between 30 35 radii, which places it in particle environment throughout most its orbit. It has been shown previous studies that these particles have direct immediate access to atmosphere [Reid, 1970]. Our majority ionization resulting from influx protons occurs altitude range ∼ 50–90 km. Excess altitudes causes enhanced cosmic HF radio waves. levels used for comparison this were measured directly riometer South Pole station, Antarctica. show very strong correlation incident path-integrated noise significant events, involving absorptions greater than 1.0 dB. For lower is obvious other phenomena dominate. waves primary contributors PCA with energies near 20 MeV. extends correlated observations interplanetary 9-year period. close quantitative agreement calculated values supports validity assumptions suppositions made model. also suggest method may be probe E D layers ionosphere determine effective ion-electron recombination coefficients within regions.