Quasi-steady corotating structure of interplanetary geomagnetic disturbances - A survey of solar cycles 13-20

Details Quasi-steady corotating structure of interplanetary geomagnetic disturbances - A survey of solar cycles 13-20 Quasi-steady corotating structure of interplanetary geomagnetic disturbances - A survey of solar cycles 13-20

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.1235z&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Feb. 1, 1989, p. 1235-1244.

Physics

2

Geomagnetism, Interplanetary Magnetic Fields, Magnetic Disturbances, Solar Activity Effects, Solar Cycles, Corotation, Magnetic Dipoles, Solar Terrestrial Interactions, Statistical Analysis

Scientific paper

Studies of the quasi-steady corotating solar-terrestrial variation (Zhang et al., 1985, 1986) are extended to include the long-time series of geomagnetic index C9 data covering solar cycles 13-20. It is found that the corotating variation has a steady structure of distribution in the Carrington rotation during solar minima. The analysis of seasonal distribution trends suggests that each of the two main peaks maintains the same magnetic polarity during the even cycles. The locations of the peaks in even cycle minima show only a small systematic drift in heliospheric longitude from 1913 to 1974, suggesting that the stable high-speed solar wind streams originate from a deeply rooted configuration of the general solar magnetic field which persists for at least four solar cycles.

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