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Characteristics of Type-II Radio Bursts Associated with Flares and CMEs

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Abstract

We present a statistical study of the characteristics of type-II radio bursts observed in the metric (m) and deca-hectometer (DH) wavelength range during 1997–2008. The collected events are divided into two groups: Group I contains the events of m-type-II bursts with starting frequency ≥ 100 MHz, and group II contains the events with starting frequency of m-type-II radio bursts < 100 MHz. We have analyzed both samples considering three different aspects: i) statistical properties of type-II bursts, ii) statistical properties of flares and CMEs associated with type-II bursts, and iii) time delays between type-II bursts, flares, and CMEs. We find significant differences in the properties of m-type-II bursts in duration, bandwidth, drift rate, shock speed and delay between m- and DH-type-II bursts. From the timing analysis we found that the majority of m-type-II bursts in both groups occur during the flare impulsive phase. On the other hand, the DH-type-II bursts in both groups occur during the decaying phase of the associated flares. Almost all m-DH-type-II bursts are found to be associated with CMEs. Our results indicate that there are two kinds of shock in which group I (high frequency) m-type-II bursts seem to be ignited by flares whereas group II (low frequency) m-type-II bursts are CME-driven.

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Authors and Affiliations

  1. School of Physics, Madurai Kamaraj University, Madurai, 625021, India

    V. Vasanth, S. Umapathy & M. Anna Lakshmi

  2. Hvar Observatory, Faculty of Geodesy, Zagreb, Croatia

    Bojan Vršnak

Authors
  1. V. Vasanth
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  2. S. Umapathy
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  3. Bojan Vršnak
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  4. M. Anna Lakshmi
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Correspondence to V. Vasanth.

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Vasanth, V., Umapathy, S., Vršnak, B. et al. Characteristics of Type-II Radio Bursts Associated with Flares and CMEs. Sol Phys 273, 143–162 (2011). https://doi.org/10.1007/s11207-011-9854-y

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  • DOI: https://doi.org/10.1007/s11207-011-9854-y

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