Recurrent magnetic activity, sunspot number and its rate of decline

Details Recurrent magnetic activity, sunspot number and its rate of decline Recurrent magnetic activity, sunspot number and its rate of decline

Jan 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975soph...40..235b&link_type=abstract

Solar Physics, vol. 40, Jan. 1975, p. 235-239.

Physics

Geomagnetism, Magnetic Disturbances, Power Spectra, Solar Cycles, Sunspot Cycle, Autocorrelation, Flux Density, Fourier Analysis, Least Squares Method, Magnetic Storms, Twenty-Seven Day Variation

Scientific paper

Investigations were made of the power spectra of the low-latitude horizontal intensity of the geomagnetic field during the declining phases of four solar activity cycles. The studies show that the development of bipolar regions during a solar cycle is a consequence of the development, about 5 yr earlier, of unipolar magnetic regions on the sun. Thus, the power density in the 27-day wavelength region of the low-latitude geomagnetic field spectrum can be used to make a reliable estimate of the sunspot maximum during the peak of the following solar cycle.

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