A search for geomagnetic storm evidence of the reversal of the solar dipole magnetic field and interplanetary B(z)

Details A search for geomagnetic storm evidence of the reversal of the solar dipole magnetic field and interplanetary B(z) A search for geomagnetic storm evidence of the reversal of the solar dipole magnetic field and interplanetary B(z)

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.3485k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A3, p. 3485-3489.

Physics

3

Interplanetary Magnetic Fields, Magnetic Dipoles, Magnetic Field Inversions, Magnetic Storms, Solar Magnetic Field, Solar Terrestrial Interactions, Stellar Mass Ejection, Geomagnetism, Magnetic Field Configurations, Solar Activity Effects, Solar Corona, Sudden Storm Commencements, Sunspots

Scientific paper

The axis of the solar dipole magnetic field is aligned to within 30 deg of the solar rotational axis for up to 2 years during solar minima. Coronal mass ejections (CMEs) during those periods arise from the equatorial streamer belts and should share the magnetic orientation of the dipole field. If those field orientations are maintained in interplanetary space, CMEs producing geomagnetic storms should be characterized by southward (Bz) during minima when the fields point outward in the northern solar hemisphere and by northward (Bz) at alternate minima when the solar dipole is reversed. Since southward (Bz) is an important factor in producing geomagnetic storms, we should expect that storms during minima characterized by southward Bz are significantly larger than those during the alternate minima. Storm data from 10 solar minima are used to test this hypothesis. The test yields a null result.

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