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Satellite OV 5-6 Measured Solar Proton Event Alpha/Proton Flux Ratios and Associated Atmospheric Effects.
Final scientific rept.,
PANAMETRICS INC WALTHAM MASS
Pagination or Media Count:
The time dependence of satellite OV5-6 measured proton and alpha fluxes has been determined for a series of events in the 1969-73 descent period of solar cycle 20. These fluxes have been used to investigate the variation of the alphaproton flux ratio both within a given event and from event-to-event. An approximate relationship between riometer absorption and the square root of proton flux above a threshold energy of 2.2 MeV for nighttime PCA conditions is presented which is similar to that previously used for day conditions. By use of a new formulation the proton fluxes are used to make an accurate calculation of the absorption and this is compared with both the approximate and measured values. Also discussed are possible uses of alphaproton measurements made soon after event onset for later time predictions, in particular the time evolution of absorption. Author
APPROVED FOR PUBLIC RELEASE