On the location of solar active longitudes

Details On the location of solar active longitudes On the location of solar active longitudes

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985basi...13...53s&link_type=abstract

Astronomical Society of India, Bulletin, vol. 13, March 1985, p. 53-61.

Astronomy and Astrophysics

Astronomy

1

Distribution (Property), Solar Activity Effects, Solar Flares, Solar Longitude, Sudden Ionospheric Disturbances, Drift Rate, Periodic Variations, Time Dependence

Scientific paper

The longitudinal distributions of sudden ionospheric disturbances producing active regions with high flares activity and/or with at least one high energy flare particle event (PCA or GLE) have been examined. These active regions appear to cluster at four active longitudes, separated by a longitudinal distance of about 60 and 180 deg. It is also inferred that these active longitudes drift in position by about 21.55 deg per year, thus exhibiting almost rigid rotation. Quasi-periodicities of 2.3 to 5.3 yr are also seen in 12 Fourier spectra of time series of high flare activity regions in 30 deg wide longitude range. These periodicities have been interpreted as due to drifting of four active longitudes having 60 and 120 longitudinal separations.

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