Physics
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.7893p&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, May 1, 1991, p. 7893-7896.
Physics
61
Dynamic Pressure, Magnetopause, Solar Activity Effects, Solar Cycles, Solar Wind Velocity, Explorer 50 Satellite, International Sun Earth Explorer 1, International Sun Earth Explorer 2, Solar Terrestrial Interactions
Scientific paper
The 10 years of the ISEE 1 and 2 mission covering much of solar cycle 21 and the beginning of solar cycle 22 make it possible to study the position, shape, and motion of the magnetopause throughout the course of changing solar activity. The size and shape of the magnetopause were determined for each observing season using the ISEE 1 and 2 magnetometer data IMP 8 data were used to monitor the solar wind changes with the solar cycle. During the 1979-1980 season, at solar maximum, the solar wind dynamic pressure was at its lowest values, and, at solar minimum, the solar wind pressure was at its largest values, more than double the value in the 1979-1980 season. During this solar cycle, the magnetopause was about 0.5 R(E) farther when the interplanetary magnetic field (IMF) was strongly northward, than when strongly southward. Both standoff distance values are fround to be smaller than the value found by Fairfield (1971). The standoff distance of the magnetopause for northward IMF is anticorrelated with the solar wind pressure. However, the standoff distance for southward IMF seems relatively insensitive to solar wind dynamic pressure.
Petrinec S. P.
Russell Christopher T.
Song Paul
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