Statistical Survey of Coronal Mass Ejections and Interplanetary Type II Bursts

V Krupar,J Magdalenić,A Szabo,N Gopalswamy,O Kruparova,F Němec,J P Eastwood

doi:10.3847/1538-4357/ab3345

Abstract

Abstract Coronal mass ejections (CMEs) are responsible for most severe space weather events, such as solar energetic particle events and geomagnetic storms at Earth. Type II radio bursts are slow drifting emissions produced by beams of suprathermal electrons accelerated at CME-driven shock waves propagating through the corona and interplanetary medium. Here, we report a statistical study of 153 interplanetary type II radio bursts observed by the two STEREO spacecraft between 2008 March and 2014 August. The shock associated radio emission was compared with CME parameters included in the Heliospheric Cataloguing, Analysis and Techniques Service catalog. We found that faster CMEs are statistically more likely to be associated with the interplanetary type II radio bursts. We correlate frequency drifts of interplanetary type II bursts with white-light observations to localize radio sources with respect to CMEs. Our results suggest that interplanetary type II bursts are more likely to have a source region situated closer to CME flanks than CME leading edge regions.

Highlights

Coronal mass ejections (CMEs) are large-scale magnetized plasma disturbances propagating through the corona and the interplanetary medium (Burlaga et al 1987)
We have found 156 interplanetary type II radio bursts detected by Solar TErrestrial RElations Observatory (STEREO)/WAVES associated with STEREO/Heliospheric Imager (HI) CMEs (Figure 4(b))
We have found that 11% of STEREO/HI CMEs are associated with interplanetary type II radio bursts (Figure 4(c))

Summary

Introduction

Coronal mass ejections (CMEs) are large-scale magnetized plasma disturbances propagating through the corona and the interplanetary medium (Burlaga et al 1987). Gopalswamy et al (2005) analyzed a large number of type II bursts measured by the Wind spacecraft in conjunction with white-light observations of CMEs by the Solar Heliospheric Observatory (SOHO). We analyze white-light and radio measurements obtained by the twin-spacecraft Solar TErrestrial RElations Observatory (STEREO) mission (Kaiser et al 2008). Our analysis exploits CMEs included in the HELCATS/HIGeoCAT catalog, which can be directly compared to radio measurements recorded by the STEREO/WAVES/HFR1 instrument due to an overlapping coverage of radial distances from the Sun. For the first time, we compare statistical properties of interplanetary type II bursts with CMEs observed by heliospheric imagers.

Observation and Analysis

Statistical Results

Summary and Conclusion