On the recurrence of sudden ionospheric disturbances

Details On the recurrence of sudden ionospheric disturbances On the recurrence of sudden ionospheric disturbances

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984basi...12..223s&link_type=abstract

Astronomical Society of India, Bulletin, vol. 12, Sept. 1984, p. 223-228.

Astronomy and Astrophysics

Astronomy

1

Power Spectra, Solar Flares, Solar Terrestrial Interactions, Solar X-Rays, Sudden Ionospheric Disturbances, Bursts, Extreme Ultraviolet Radiation, H Alpha Line

Scientific paper

The power spectrum of sudden-ionospheric-disturbance (SID) occurrence obtained from published observations for the maximum-activity period from January, 1978, to September, 1982, is analyzed. Significant frequencies corresponding to periods of 27.02, 18.0, and 13.5 days are identified and attributed to at least four active longitudes (in 60-deg-separated pairs of 180-deg-separated lines) on the solar disk.

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