Solar flares increased in 1982
Article first published online: 3 JUN 2011
©1983. American Geophysical Union. All Rights Reserved.
Eos, Transactions American Geophysical Union
Volume 64, Issue 15, page 137, 12 April 1983
How to Cite
1983), Solar flares increased in 1982, Eos Trans. AGU, 64(15), 137–137, doi:10.1029/EO064i015p00137-01.(
- Issue published online: 3 JUN 2011
- Article first published online: 3 JUN 2011
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Geomagnetic storms and solar flares occurred more frequently in 1982 (3 years after the solar maximum of the current 11-year sunspot cycle) than is usual for that portion of the cycle. Among the most notable events were two X-12 flares and one X-7 flare. Although less intense, the X-7 flare triggered the most fierce geomagnetic storm in a decade; it distorted the earth's magnetic field, disrupted long-range communications and low-frequency navigational systems, interfered with ham radio activities, and spread a brilliant auroral display over much of the nation.
Solar flares are divided into three classes depending on the output of X radiation: the common C class, the moderate M class, and the intensive X class. The numerical designation indicates the level of radiation intensity; an X-12, which is t h e most intense that instruments can measure, is 12 times more intense than an X-1 . An X-1 flare releases 10 times more radiation than an M-1, and 100 times more than a C-1.