Spotless flares and the associated radio continuum emission |
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| Authors: | V Ru?djak M Messerotti M Nonino A Schroll B Vr?nak P Zlobec |
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| Institution: | (1) Hvar Observatory, 58450 Hvar, Yugoslavia;(2) SISSA-ISAS, 34014 Trieste, Italy;(3) Astronomical Department of Trieste University, 34131 Trieste, Italy;(4) Sonnenobservatorium Kanzelhöhe, 9520 Sattendorf, Austria;(5) Trieste Astronomical Observatory, 34131 Trieste, Italy |
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| Abstract: | We studied 24 spotless flares of Ha importance  1 which occurred during the 21st cycle of solar activity. The spotless flares could be grouped in three categories according to their location and time history of the associated active region. Our association of the flares with radio events was based on relative timing and on the flare importances. Weak microwave gradual rise and fall events were frequently recorded during the occurrence of the spotless flares. A few flares from our sample could be associated with impulsive and complex microwave bursts. Only in one case an association of a spotless flare with a significant metric type II/IV event seems to be justified.Proceedings of the Second CESRA Workshop on Particle Acceleration and Trapping in Solar Flares, held at Aubigny-sur-Nère (France), 23–26 June, 1986. |
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