The heliographic latitude dependence and sector structure of the interplanetary magnetic field 1969-1974 - Results from the HEOS satellites

Details The heliographic latitude dependence and sector structure of the interplanetary magnetic field 1969-1974 - Results from the HEOS satellites The heliographic latitude dependence and sector structure of the interplanetary magnetic field 1969-1974 - Results from the HEOS satellites

Sep 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975soph...44..205h&link_type=abstract

Solar Physics, vol. 44, Sept. 1975, p. 205-224. Research supported by the Science Research Council.

Physics

8

Heos Satellites, Interplanetary Magnetic Fields, Polar Regions, Spectroheliographs, Magnetohydrodynamic Flow, Satellite Observation, Solar Wind Velocity, Statistical Analysis

Scientific paper

Data from the two HEOS satellites obtained during the period from December 1968 to August 1974 are used to investigate the large-scale properties of the interplanetary magnetic field. The sector structure has been deduced from the observed times of sector-boundary crossings. A two-sector pattern existed throughout most of the period with occasional intervals of 2 to 3 months' duration in which four sectors appeared. The variation of the dominant sector polarity with heliographic latitude showed a reversal in sense during 1971 at the time of the reported reversal in the sun's polar field. A statistical analysis of the change in polarity distribution with latitude suggests that at earth's orbit, the sector boundaries are inclined to the solar equator, on the average, at an angle of 12 deg. No evidence was found in the HEOS measurements of the north-south field component to confirm the systematic latitude-dependent deviation of the plasma flow away from the solar equatorial plane suggested by several analyses of data from previous spacecraft. The mean field magnitude and the average amplitude of the directional fluctuations appeared to be independent of heliographic latitude within the 7.3-deg range explored.

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