Physics
Scientific paper
Nov 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9819111s&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A11, p. 19,111-19,116
Physics
3
Annual Variations, Cosmic Noise, Electron Precipitation, Geomagnetism, High Energy Electrons, Spectral Energy Distribution, Trapped Particles, Ionospheric Electron Density, Riometers, Solar Activity, Solar Cycles, Solar Terrestrial Interactions, Solar Wind
Scientific paper
From minute-by-minute and daily-averaged absorptions of cosmic radio wave noise, deduced from continuous nometer recordings during the last 20 years at Sanae, the annual temporal pattern of energetic (larger than or approx. equal to 40 keV) electron energy flux deposited per second into the atmosphere has been estimated. We conclude that the energy flux deposited per second is closely related to geomagnetic activity, both for auroral precipitation during magnetic active periods and for particles precipitated from the trapping regions. The average energy flux deposited per second is strongly peaked during the equinoxes and has a deep minimum during the summer and winter, related to the equinoctial effect of geomagnetic activity. No difference exists between the energy fluxes deposited per second during the illuminated Antarctic summer and the dark Antarctic winter. It follows then that the daytime deposited flux is larger than the nighttime averaged deposition of energetic electrons. The averaged electron energy flux deposited per second peaked during 1973-1975 and 1982-1984, years with persistent solar wind high-speed streams from low solar latitude coronal holes, and has a lower value in a year of solar polar magnetic reversal, i.e., in 1971 and in 1980, than during solar minimum activity in 1976 and 1986/1987. During the 20 years of investigation the solar flares events of August 1972 and October 1989 are outstanding in flux of electron precipitation, being approx. 3 orders of magnitude larger than the annually averaged flux.
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