Geomagnetic Activity and Hale Sector Boundaries.
STANFORD UNIV CA INST FOR PLASMA RESEARCH
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The variation of the geomagnetic activity index Ap at the Interplanetary Magnetic Field IMF sector boundaries to - and - to has been studied for three solar cycles, separating data into vernal and autumnal equinoxes. It was found that a reported increase in Ap as an effect of a Hale boundary can be better attributed to the occurrence of a negative IMF Bz component in the geocentric solar magnetospheric coordinate system and to the occurrence of high speed solar wind streams.
- Atmospheric Physics