A comparison of coronal rotation and interplanetary recurrence during 1964-76

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Interplanetary Magnetic Fields, Solar Corona, Solar Rotation, Solar Wind, Corotation, Solar Cycles, Twenty-Seven Day Variation

Scientific paper

An observational investigation is conducted on the relationships between the recurrence of interplanetary phenomena at intervals which are multiples of the solar rotation period and the differential rotation of the white light corona during 1964-1976. Solar wind stream structure and geomagnetic recurrence have characteristic periods which relate best to coronal rotation periods at middle latitudes for the 1.1 R(S) corona and at low to middle latitudes for the 1.5 R(S) corona. A simple matching of 1.1 R(S) K-coronal rotation with the nominal 27-day stream recurrence period suggests that solar wind meridional motions over 1 AU are typically 20 deg of latitude, significantly less than the exceptional meridional flows of 50-60 deg reported during Skylab. Meridional flows are not required by these observations, however, if the longitudinal pattern of stream sources near the ecliptic is controlled by magnetic fields anchored at latitudes of about 20 deg.

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