Quasi-steady corotating structure of geomagnetic disturbance during solar minimum from 13th through 20th solar cycle

Details Quasi-steady corotating structure of geomagnetic disturbance during solar minimum from 13th through 20th solar cycle Quasi-steady corotating structure of geomagnetic disturbance during solar minimum from 13th through 20th solar cycle

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987sssmp..30..298g&link_type=abstract

Scientia Sinica, Series A - Mathematical, Physical, Astronomical and Technical Sciences (ISSN 0253-5831), vol. 30, March 1987, p

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Geomagnetism, Magnetic Disturbances, Magnetic Field Configurations, Solar Activity, Solar Cycles, Solar Terrestrial Interactions, Corotation, Digital Filters, Harmonic Analysis, Solar Interior, Solar Rotation, Statistical Analysis

Scientific paper

The corotating variation of geomagnetic index C9 has been studied by the digital filter, superposed-epoch, and harmonic analysis methods covering the long time series of data from the 13th through the 20th solar cycles. The main results obtained show that during solar minima the corotating variation has quite steady structure of distribution in the Carrington rotation, for which the phase of the second harmonic remains nearly the same in each of the even or odd cycles, and reverses from one to another cycle. Inferred from the seasonal trend of the distribution, it has been noted that each of the two main peaks maintains the same magnetic polarity during the even cycles; therefore it is likely that their source regions are located in the northern and southern solar hemispheres, respectively, for the left and right peaks. Also the location of the peak drifts against the solar rotation just as the earth's main magnetic field does. It is inferred that the stable high-speed solar-wind stream originates from the configuration of the solar general magnetic field which has roots deep in the solar interior and possesses a quasi-steady distribution pattern that changes alternatively within the 22-year solar magnetic cycle.

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