Physics
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13..513s&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 13, June 1986, p. 513-516. NASA-supported research.
Physics
60
International Sun Earth Explorer 3, Interplanetary Magnetic Fields, Magnetic Measurement, Solar Activity Effects, Field Strength, Long Term Effects, Magnetic Flux, Solar Cycles, Sunspots
Scientific paper
Temporal variations in the IMF during solar cycle 21 are investigated using magnetic field observations collected by the vector helium magnetometer on the ISEE-3/ICE spacecraft. Analysis of the observations reveal that the IMF magnitude, which had declined to 4.7 nT in 1976, peaked in late 1982 (two years after solar maximum) at 9.0 nT and rapidly decreased during 1983-1984 to an intensity of 6.2 nT in early 1985. The IMF intensities are compared with the auroral AE index; the observed peak in strength during 1981-1983 is related to a 50 percent increase in substorm activity levels. A decrease in Parker spiral angle, revealing the existence of high-speed streams is detected in the declining phase of the solar cycle. Variations in the intensity of the IMF correlate with Mt. Wilson magnetograph measurements of full disk magnetic flux. Source regions for the evolution of solar wind and the IMF are proposed.
Jungman Gerard
Slavin James Arthur
Smith Edward. J.
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