The frequency of long-duration solar X-ray events

Details The frequency of long-duration solar X-ray events The frequency of long-duration solar X-ray events

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985soph...97..375k&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 97, June 1985, p. 375-379.

Physics

5

Solar Cycles, Solar X-Rays, Sunspots, Annual Variations, Interplanetary Medium, Solar Corona

Scientific paper

The rate of occurrence of coronal and interplanetary phenomena during the solar sunspot cycle was studied based on nearly continuous satellite data for long-duration events in the period 1969-1982. The data were obtained using the NRL SOLRAD and the NOAA GOES spacecraft for each year in the interval. The duration of the X-ray events was defined as the time for the logarithm of the 1-8 A flux to return to approximately 10 percent of the pre-event level. The total number of X-ray events is plotted next to the annual sunspot number for the interval 1969-1982. It is shown that the long duration of X-ray events was not related to the sunspot cycle, particularly events of 6 hr or more.

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