Solar type II and type IV radio bursts observed during 1998-2000 with the ARTEMIS-IV radiospectrograph
Hillaris, A.; Preka-Papadema, P.; Moussas, X.; Bouratzis, C.; Tsitsipis, P.; Kontogeorgos, A.; Bougeret, J. -L.; Caroubalos, C.; Alissandrakis, C. E.; Polygiannakis, J.; Dumas, G.; Perche, C.
Greece, France
Abstract
A catalogue of the type II and type IV solar radio bursts in the 110-687 MHz range, observed with the radio spectrograph ARTEMIS-IV operated by the University of Athens at Thermopylae, Greece from 1998-2000 is presented. These observations are compared with the LASCO archives of Coronal Mass Ejections and the Solar Geophysical Reports of solar flares (Hα & SXR) and examined for possible associations. The main results are:
68% of the catalogue events were associated with CMEs. 67% of the type II events were associated with CMEs, in accordance with previous results. This percentage rises to 79% in the case of composite type II/IV events. 77% of the type IV continua were associated with CMEs, which is higher that the CME-type II association probability. The type II associated CMEs had an average velocity of (835 ± 380) km s-1, while the CMEs not associated with type IIs had an average velocity of (500 ± 150) km s-1. All events, but one, were well associated with H\alpha and/or SXR flares. Most of the CME launch times precede by 5-60 min (30 min on average) the associated SXR flare peak; an important fraction (72%) precede the flare onset as well. Appendix A is only available in electronic form at http://www.edpsciences.org