The solar origin of long-term variations of the interplanetary magnetic field strength

Details The solar origin of long-term variations of the interplanetary magnetic field strength The solar origin of long-term variations of the interplanetary magnetic field strength

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....9311227w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Oct. 1, 1988, p. 11227-11236. Navy-supported research.

Physics

56

Field Strength, Interplanetary Magnetic Fields, Long Term Effects, Magnetic Variations, Solar Activity Effects, Magnetic Flux, Minima, Photosphere, Secular Variations, Solar Cycles

Scientific paper

Using simple models for the coronal field structure, the spacecraft observations of the photospheric field during sunspot cycle 21 were extrapolated for the purpose of modeling quantitatively the long-term behavior of the IMF during the sunspot cycle 21. Results were compared with the measurements of the radial component of the IMF at earth. The results indicate that the solar source of the IMF can be represented to a first approximation by the dipole component of the photospheric field, whose axis is nearly perpendicular to the ecliptic plane around sunspot minimum, but tilts more strongly toward it around sunspot maximum. It was also found that the average radial IMF strength varies with heliographic latitude; around sunspot minimum, the radial IMF is expected to be roughly twice as strong above the sun's poles as near the ecliptic plane. The average strength of the photospheric field above latitude 55 deg is about 10 G around sunspot minimum.

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