The role of the magnetic field intensity and geometry in the type III burst generation |
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| Authors: | P Zlobec V Ru?djak B Vr?nak M Karlický M Messerotti |
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| Institution: | (1) Trieste Astronomical Observatory, Italy;(2) Hvar Observatory, Yugoslavia;(3) Ond ejov Observatory, Czechoslovakia |
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| Abstract: | We study the association of type III bursts related to H flares in different magnetic environments in the period 1970–1981. Special attention is paid to flares which partly cover a major spot umbra (Z-flares). In particular we consider the location of the spots in the active regions and the magnetic field intensities of spots covered by a ribbon. The association rate with type III bursts decreases to 17% when the flare is located inside the bipolar pattern of a large active region, compared with an association rate of 54% when the flare is situated outside it. The association rate increases with the magnetic field intensity of the spot covered by H emission; this is most clearly revealed for the flares occurring outside the bipolar pattern of active regions. Ninety-three percent of the flare-associated type III burst were accompanied by 10 cm radio bursts. For the most general case in which a flare is developing anywhere in an active region, the association with type III bursts generation increases with the increasing magnetic field intensity of the main spot of the group. |
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