Coronal Shocks Associated with Impulsive and Decaying Phases of Solar Flares |
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| Authors: | K Suresh S Umapathy A Shanmugaraju B Vr?nak |
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| Institution: | (1) Institute of Solar-Terrestrial Physics SB RAS, Lermontov St. 126A, Irkutsk, 664033, Russia;(2) Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation (IZMIRAN), Troitsk, Moscow Region, 142190, Russia;(3) Ussuriysk Astrophysical Observatory, Solnechnaya St. 21, Primorsky Krai, Gornotaezhnoe, 692533, Russia;(4) National Institute of Information and Communications Technology, Tokyo, Japan |
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| Abstract: | We have analyzed a set of 147 metric Type II radio bursts observed by Culgoora radio spectrograph from November 1997 to December
2006. These events were divided into two sets: The first subset contains Type II events that started during the impulsive
phase of the associated solar flares and the second subset contains those starting during the decaying phase of flares. Our
main aim is to differentiate the metric Type IIs, flares and coronal mass ejections (CMEs) of these two subsets. It is found
that while Type II burst characteristics of both subsets are very similar, there are significant differences between flare
and CME properties for these two subsets. Considering all analyzed relationships between the characteristics of Type IIs,
flares and CMEs in these two Type II subsets, we conclude that most of the coronal shocks causing metric Type II bursts are
driven by CMEs, but that a fraction of events are probably ignited by solar flares. |
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