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Coronal Shocks Associated with Impulsive and Decaying Phases of Solar Flares

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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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Authors and Affiliations

  1. School of Physics, Madurai Kamaraj University, Madurai, India

    K. Suresh & S. Umapathy

  2. Department of Physics, Arul Anandar College, Karumathur, Madurai, India

    A. Shanmugaraju

  3. Hvar Observatory, Faculty of Geodesy, Kačićeva 26, 10000, Zagreb, Croatia

    B. Vršnak

Authors
  1. K. Suresh
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  2. S. Umapathy
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  3. A. Shanmugaraju
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  4. B. Vršnak
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Correspondence to K. Suresh.

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Suresh, K., Umapathy, S., Shanmugaraju, A. et al. Coronal Shocks Associated with Impulsive and Decaying Phases of Solar Flares. Sol Phys 264, 353–364 (2010). https://doi.org/10.1007/s11207-010-9585-5

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  • DOI: https://doi.org/10.1007/s11207-010-9585-5

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