Physics
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984esasp.220..237s&link_type=abstract
In ESA The Hydromagnetics of the Sun p 237-238 (SEE N85-25091 14-92)
Physics
3
Geomagnetism, Solar Activity Effects, Solar Cycles, Solar Magnetic Field, Solar Wind, Dynamo Theory, Solar Terrestrial Interactions, Twenty-Seven Day Variation
Scientific paper
The mechanism at the origin of the generation of geomagnetic activity by wind streams situated at both polar holes of the Sun is discussed. The stream expansion factor is controlled by the polar field intensity which thereby is monitored by the level of this geomagnetic activity. The poloidal field begins to emerge at low latitude 1 or 2 yr before a sunspot maximum and moves toward the poles. As 2 or 3 such low latitude mergences currently occur, the intensity of the polar field increases regularly and peaks 5 yr after the sunspot maximum. Then it decreases smoothly and disappears 1 or 2 yr after the next sunspot maximum in order to leave the polar cap to the new field. This poloidal field, as expected from dynamo theory, is not axisymmetric. The total duration of the solar cycle phenomena is 21 yr with 13 yr of poloidal field and 13 of toroidal field emergence and an overlaping of 6 yr of the first one on the second and a delay of 5 yr between both intensity peaks.
Legrand Jean-Pierre
Simon P. A.
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