It is shown that the onset of solar flares, within about 2 min or less before the impulsive peaks, is characterized by an increase in high-energy emission at E less than 100 keV, and strong broadening of soft X-ray lines characteristic of the 10-million-K plasma already present at this stage. The observations are interpreted in terms of the early signature of energy release, during a phase preceding the instability that leads to strong particle acceleration.
Flare onsets in hard and soft X-rays
Advances in Space Research ; 6 , 6, 19
01.01.1986
Sonstige
Keine Angabe
Englisch
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