Hemispherical asymmetries in sunspot areas and auroral frequencies

Details Hemispherical asymmetries in sunspot areas and auroral frequencies Hemispherical asymmetries in sunspot areas and auroral frequencies

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991soph..135..407s&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 135, Oct. 1991, p. 407-413.

Physics

7

Auroras, Solar Activity, Sunspot Cycle, Frequency Distribution, Latitude, Northern Hemisphere

Scientific paper

One thousand and fifty-two auroras boreales and 554 auroras australes recorded during the nineteenth century at medium latitudes of less than or equal to 55 deg N or less than or equal to 55 deg S are compared statistically with the known hemispherical asymmetry of the sums of the areas of sunspots. According to the present study, the solar hemispherical asymmetry can be accompanied by an analogous pattern of the hemispherical frequency of auroral days. For the number of auroral days in each hemisphere beyond the two auroral ovals, a remarkable degree of phase equality with the sunspot areas during the second Gleissberg cycle can be demonstrated.

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