Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975georl...2..561k&link_type=abstract
Geophysical Research Letters, vol. 2, Dec. 1975, p. 561-564.
Astronomy and Astrophysics
Astronomy
11
Electron Energy, Interplanetary Medium, Jupiter (Planet), Solar Wind, Electronic Spectra, Energy Spectra, Planetary Magnetic Fields, Spaceborne Astronomy
Scientific paper
Results are reported for observations of a number of quiet-time enhancements in the intensity of low-energy interplanetary electrons (0.22 to 2.5 MeV) by the IMP 7 (Explorer 47) spacecraft during 1972 and 1973. It is noted that the enhancements lasted from 3 to 20 days and were observed both in the interplanetary medium and within the earth's magnetotail. The main features of the observations are described, and the enhancements are shown to represent a distinct class of events that are clearly different from the solar electron events responsible for magnetospheric bursts. It is found that these increases occur at times when a connection between the interplanetary magnetic field and the Jovian magnetosphere is reasonably favorable and that the energy spectrum is similar to that observed by the Pioneer spacecraft in the vicinity of Jupiter. The length of the Jovian magnetotail is estimated to be about 4.6 AU in the case of a 20-day event and an assumed solar-wind velocity of 400 km/sec.
Armstrong Thomas P.
Krimigis Stamatios M.
Sarris Emmanuel T.
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