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Forecasting the intensity of solar proton events from the time characteristics of solar microwave bursts

✍ Scribed by David L. Croom

Publisher
Springer
Year
1971
Tongue
English
Weight
712 KB
Volume
19
Category
Article
ISSN
0038-0938

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✦ Synopsis

A survey of the main characteristics of solar microwave bursts in relation to their usefulness for indicating the intensity of associated solar proton emissions suggests that time parameters give much better results than intensity or spectrum parameters. In particular, best results are obtained by using the effective, or mean, burst duration defined by

where Tis the overall burst duration, P is the power density at time t, and Pm~ is the maximum power density. For proton energies > 10 MeV the proton flux N~ is given approximately by N~ = 0.034 T~s 3 particles ster -1 cm -2 s -~, where T~ is in minutes, with a correlation factor of 0.8. Corresponding coefficients have been derived for a number of energy ranges. Using this parameter solar proton warnings and intensity estimates can be made with observations at only one frequency, preferably in the range 5-20 GHz.

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