caa a22 4500 445347147 CHVBK 20180317142832.0 cr unu---uuuuu 170323e20111001xx s 000 0 eng 10.1007/s11207-011-9854-y doi (NATIONALLICENCE)springer-10.1007/s11207-011-9854-y Characteristics of Type-II Radio Bursts Associated with Flares and CMEs [Elektronische Daten] [V. Vasanth, S. Umapathy, Bojan Vršnak, M. AnnaLakshmi] 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 ≥ 100MHz, and group II contains the events with starting frequency of m-type-II radio bursts < 100MHz. 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. Springer Science+Business Media B.V., 2011 Coronal mass ejections nationallicence Shocks nationallicence Solar flares nationallicence Type-II radio bursts nationallicence Vasanth V. School of Physics, Madurai Kamaraj University, 625021, Madurai, India aut Umapathy S. School of Physics, Madurai Kamaraj University, 625021, Madurai, India aut Vršnak Bojan Hvar Observatory, Faculty of Geodesy, Zagreb, Croatia aut AnnaLakshmi M. School of Physics, Madurai Kamaraj University, 625021, Madurai, India aut Solar Physics Springer Netherlands 273/1(2011-10-01), 143-162 0038-0938 273:1<143 2011 273 11207 https://doi.org/10.1007/s11207-011-9854-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11207-011-9854-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Vasanth V. School of Physics, Madurai Kamaraj University, 625021, Madurai, India aut NATIONALLICENCE 700 1- Umapathy S. School of Physics, Madurai Kamaraj University, 625021, Madurai, India aut NATIONALLICENCE 700 1- Vršnak Bojan Hvar Observatory, Faculty of Geodesy, Zagreb, Croatia aut NATIONALLICENCE 700 1- AnnaLakshmi M. School of Physics, Madurai Kamaraj University, 625021, Madurai, India aut NATIONALLICENCE 773 0- Solar Physics Springer Netherlands 273/1(2011-10-01), 143-162 0038-0938 273:1<143 2011 273 11207 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer