Preferred longitudes of sunspot groups and high-speed solar wind streams - Evidence for a 'solar memory'

Details Preferred longitudes of sunspot groups and high-speed solar wind streams - Evidence for a 'solar memory' Preferred longitudes of sunspot groups and high-speed solar wind streams - Evidence for a 'solar memory'

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...87...23b&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 87, Aug. 1983, p. 23-36.

Physics

16

Longitude, Solar Activity, Solar Wind Velocity, Sunspots, Correlation, Long Term Effects, Power Spectra, Solar Cycles, Solar Rotation

Scientific paper

Correlation analysis of the mean longitude distribution of sunspot groups (taken from the Greenwich Photoheliographic Results) and high-speed solar wind streams (inferred from the C9 index for geomagnetic disturbances) with the Bartels rotation period P = 27.0 days shows anticorrelation for individual cycles. In particular, the longitudes of post-maximum stable streams of cycle 18 and 19 are well anticorrelated with the preferred longitudes of sunspot groups during the maximum activity periods of these cycles. This is further analyzed using the daily Zuerich sunspot number, R, between 1932 and 1980, which reveals a conspicuous similarity of cycle 18 and 19 as well as cycle 20 and 21. It is concluded that there is a 'solar memory' for preferred longitudes of activity extending at least over one, probably two cycles (i.e., one magnetic cycle of 22 years). It is conjectured that this memory extends over longer intervals of time as a long-term feature of solar activity.

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