Solar wind and coronal structure near sunspot minimum - Pioneer and SMM observations from 1985-1987

Details Solar wind and coronal structure near sunspot minimum - Pioneer and SMM observations from 1985-1987 Solar wind and coronal structure near sunspot minimum - Pioneer and SMM observations from 1985-1987

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.8231m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, June 1, 1990, p. 8231-8242.

Physics

28

Pioneer 10 Space Probe, Pioneer 11 Space Probe, Solar Corona, Solar Maximum Mission, Solar Wind Velocity, Sunspot Cycle, Interplanetary Magnetic Fields, Pioneer Venus Spacecraft, Solar Orbits

Scientific paper

Changes in solar wind speed and magnetic polarity observed at the Pioneer spacecraft are discussed here in terms of the changing magnetic geometry implied by SMM coronagraph observations over the period 1985-1987. The pattern of recurrent solar wind streams, the long-term average speed, and the sector polarity of the interplanetary magnetic field all changed in a manner suggesting both a temporal variation, and a changing dependence on heliographic latitude. Coronal observations during this epoch show a systematic variation in coronal structure and the magnetic structure imposed on the expanding solar wind. These observations suggest interpretation of the solar wind speed variations in terms of the familiar model where the speed increases with distance from a nearly flat interplanetary current sheet, and where this current sheet becomes aligned with the solar equatorial plane as sunspot minimum approaches, but deviates rapidly from that orientation after minimum.

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