Width of Radio-Loud and Radio-Quiet CMEs

TL;DR

This study compares the angular sizes of radio-loud and radio-quiet coronal mass ejections (CMEs), revealing that radio-loud CMEs are nearly twice as wide and have distinct structural differences.

Contribution

It provides the first detailed comparison of CME widths based on radio emission characteristics using data from Wind/WAVES and SOHO/LASCO.

Findings

Radio-loud CMEs are nearly twice as wide as radio-quiet CMEs.

Radio-quiet CMEs have a narrow bright core with a large diffusive structure.

Different measurement methods confirm the width differences.

Abstract

In the present paper we report on the difference in angular sizes between radio-loud and radio-quiet CMEs. For this purpose we compiled these two samples of events using Wind/WAVES and SOHO/LASCO observations obtained during 1996-2005. It is shown that the radio-loud CMEs are almost two times wider than the radio-quiet CMEs (considering expanding parts of CMEs). Furthermore we show that the radio-quiet CMEs have a narrow expanding bright part with a large extended diffusive structure. These results were obtained by measuring the CME widths in three different ways.