DOI: 10.14704/nq.2022.20.8.NQ44735

INVESTIGATIONS ON THE CHARACTERISTICS OF SOLAR FLARES AND CMEs ASSOCIATED WITH DH TYPE II RADIO BURSTS

W. Hannah Blessy, A. Mujiber Rahman, S. Prasanna Subramanian, S.S.R. Inbanathan

Abstract

This work reports some of the statistical characteristics of coronal mass ejections (CMEs), solar flares and solar energetic particle (SEP) events associated with decametric-hectometric (DH) (1–14 MHz) type II radio bursts, during the period 1997–2017. Most of the CMEs are wide and fast with nearly 57% of them being halo CMEs. It is found that 10 – 20˚ latitudinal belt and similar longitudes of the sun are the most preferred locations for CME-flares accompanied by DH type II bursts. Here, M-class flares are the most predominant with an occurrence rate of 50% associated with DH type II bursts. Nearly half of the DH type II radio bursts spread down below to 1MHz. Their frequency of occurrence follows the solar cycle maxima and minima. The probable source locations of flares and CMEs responsible for such bursts, energetic high speed CMEs and the extension of lower ending frequencies are found to be indicative of solar energetic particle events affecting space weather.

Keywords

Coronal Mass Ejections, DH Type II Bursts, Solar Flares, CME Speed, Flare Class, Drift Rate

Full Text

References