On the correlation of microwave bursts with the Hα flares |
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Authors: | S Urpo V Ruzdjak H Teräsranta |
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Institution: | 1. Metsähovi Radio Research Station, 02540 Kylmälä, Finland;7. Hvar Observatory, Hvar, Yugoslavia |
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Abstract: | High correlation between microwave bursts and Hα flares has already been reported. However, Solar Maximum Year cooperation made it possible to do simultaneous observations of selected active regions with good spatial resolution. In this paper the results of the direct comparison of solar microwave recordings at the Metsähovi Radio Research Station and Hα films at the Hvar Observatory are reported. This comparison reveals that the correlation of microwave gradual rise and fall (GRF) events (time scale tens of minutes) with Hα flares is practically 100 percent. On the other hand the correlation of the impulsive microwave bursts (time scale tens of seconds) with Hα flares is low. From this it can be concluded that the main contribution to the microwave GRF bursts comes from thermal radiation. |
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