Physics
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.3529w&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A3, p. 3529-3537.
Physics
27
Interplanetary Magnetic Fields, Magnetic Flux, Solar Cycles, Sunspot Cycle, Magnetic Dipoles, Solar Magnetic Field, Ulysses Mission
Scientific paper
Twenty years of solar magnetograph and in-ecliptic IMF measurements are used to verify that the radial IMF component (Br) can be approximated by a superposition of the sun's inclined magnetic dipole moment and a current sheet normal to the dipole axis. The net field is found to be about three times stronger along the dipole axis than near the current sheet. Over the sunspot cycle, the absolute value of Br should undergo the least modulation near the heliographic equator and the greatest modulation above the sun's poles, where, at 1 AU, it varies systematically between about 10 nT near sunspot minimum and about 1 nT near sunspot maximum. The latitudinal gradients in the absolute value of Br are expected to be steepest around sunspot minimum and flattest near sunspot maximum. It is predicted that Ulysses will encounter very strong fields when it flies over the solar poles during the declining phase of sunspot cycle 22.
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