A survey of long-term interplanetary magnetic field variations

Details A survey of long-term interplanetary magnetic field variations A survey of long-term interplanetary magnetic field variations

Feb 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81..653k&link_type=abstract

Journal of Geophysical Research, vol. 81, Feb. 1, 1976, p. 653-660.

Physics

12

Interplanetary Magnetic Fields, Long Term Effects, Magnetic Variations, Secular Variations, Solar Activity Effects, Angular Distribution, Field Strength, Histograms, Latitude, Satellite Observation, Solar Cycles, Statistical Correlation

Scientific paper

Interplanetary-magnetic-field data from the IMP-10, IMP-A, and Heos spacecraft have been merged into a composite data set spanning the period from 1963 to 1974. Consideration of the mutual consistency of the individual data sets reveals agrement typically to within 0.2 gamma. Analysis of the composite data set reveals the following: (1) although the yearly averaged magnitudes of all field vectors show virtually no solar-cycle variation, the yearly averaged magnitudes of positive- and negative-polarity field vectors show separate solar-cycle variations consistent with variations in the average azimuthal angles of positive- and negative-polarity field vectors; (2) there is no solar latitude dependence of long-time average field magnitudes; (3) field vectors parallel to the earth-sun line are on the average 1 gamma less in magnitude than field vectors perpendicular to this line; and (4) the solar latitude-dependent dominant polarity effect exhibits a complex sign reversal in the period from 1968 to 1971 and a measure of symmetry in 1972 through 1974 not found in earlier data.

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