Other
Scientific paper
Dec 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.7371f&link_type=abstract
Journal of Geophysical Research, vol. 84, Dec. 1, 1979, p. 7371-7377. Research supported by the U.S. Department of Energy and N
Other
4
Annual Variations, Diurnal Variations, Electron Energy, Solar Activity, Solar Cycles, Solar Wind, Average, Electric Potential, Imp, Interplanetary Magnetic Fields, Satellite-Borne Instruments, Solar Corona, Solar Electrons, Solar Protons, Solar Spectra
Scientific paper
Imp solar wind electron data measured between 1971 and 1978 were studied with the aim of determining long-term variations near the earth. Two separate sets of parameter variations were observed: (1) in 1976-1977 the solar wind density, the electron temperature, and the interplanetary electrostatic potential were all enhanced, and (2) the halo density and associated electron parameters were all depressed during a 1 1/2-year period centered on the last 6 months of 1976. Although interpretation of these results in terms of corresponding coronal and interplanetary variations is not unique, it may be significant that measured solar wind parameters near the minimum of solar cycle 20 agree better with the Hartle-Sturrock model of the coronal expansion than they do during other epochs.
Asbridge J. R.
Bame J. Jr. S.
Feldman William C.
Gosling Jack T.
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