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

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

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011soph..273..143v&link_type=abstract

Solar Physics, Volume 273, Issue 1, pp.143-162

Physics

Coronal Mass Ejections, Shocks, Solar Flares, Type-Ii Radio Bursts

Scientific paper

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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