Determination of force-free factor α and forecast of proton flares

Details Determination of force-free factor α and forecast of proton flares Determination of force-free factor α and forecast of proton flares

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983cha%26a...7....6a&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 7, Issue 1, p. 6-11.

Astronomy and Astrophysics

Astrophysics

Scientific paper

We evaluated the force-free factor α for 18 well-observed proton flare regions during 1967-1972 according to the degree of twist in their neutral line. We found that, on the day of the flare, α >= 0.34 for flares of Class 1 or greater and >= 0.50 for Class 2 or greater and that α always increased over the one or two days before the flare. We therefore suggest that α can be used in forecasting proton events. We also outline a squeezing force-free field model of large flares which can better explain certain observed facts.

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