Are Solar Energetic Particle Events and Type II Bursts Associated with Fast and Narrow Coronal Mass Ejections?

Solar Physics ◽  
2019 ◽  
Vol 294 (9) ◽  
Author(s):  
S. W. Kahler ◽  
A. G. Ling ◽  
N. Gopalswamy
Keyword(s):  
Coronal Mass Ejections ◽  
Energetic Particle ◽  
Solar Energetic Particle ◽  
Type Ii ◽  
Solar Energetic Particle Events ◽  
Type Ii Bursts

scholarly journals Coronal mass ejections, type II radio bursts, and solar energetic particle events in the SOHO era

2008 ◽  
Vol 26 (10) ◽  
pp. 3033-3047 ◽  
Author(s):  
N. Gopalswamy ◽  
S. Yashiro ◽  
S. Akiyama ◽  
P. Mäkelä ◽  
H. Xie ◽  
...  
Keyword(s):  
Coronal Mass Ejections ◽  
Energetic Particle ◽  
Solar Energetic Particle ◽  
Western Hemisphere ◽  
Radio Bursts ◽  
Type Ii ◽  
Association Rate ◽  
Type Ii Radio Bursts ◽  
Type Ii Bursts ◽  
Weak Shocks

Abstract. Using the extensive and uniform data on coronal mass ejections (CMEs), solar energetic particle (SEP) events, and type II radio bursts during the SOHO era, we discuss how the CME properties such as speed, width and solar-source longitude decide whether CMEs are associated with type II radio bursts and SEP events. We discuss why some radio-quiet CMEs are associated with small SEP events while some radio-loud CMEs are not associated with SEP events. We conclude that either some fast and wide CMEs do not drive shocks or they drive weak shocks that do not produce significant levels of particle acceleration. We also infer that the Alfvén speed in the corona and near-Sun interplanetary medium ranges from <200 km/s to ~1600 km/s. Radio-quiet fast and wide CMEs are also poor SEP producers and the association rate of type II bursts and SEP events steadily increases with CME speed and width (i.e. energy). If we consider western hemispheric CMEs, the SEP association rate increases linearly from ~30% for 800 km/s CMEs to 100% for ≥1800 km/s. Essentially all type II bursts in the decametre-hectometric (DH) wavelength range are associated with SEP events once the source location on the Sun is taken into account. This is a significant result for space weather applications, because if a CME originating from the western hemisphere is accompanied by a DH type II burst, there is a high probability that it will produce an SEP event.

scholarly journals Statistical Evidence for Contributions of Flares and Coronal Mass Ejections to Major Solar Energetic Particle Events

Solar Physics ◽  
2014 ◽  
Vol 290 (3) ◽  
pp. 819-839 ◽  
Author(s):  
G. Trottet ◽  
S. Samwel ◽  
K.-L. Klein ◽  
T. Dudok de Wit ◽  
R. Miteva
Keyword(s):  
Coronal Mass Ejections ◽  
Energetic Particle ◽  
Solar Energetic Particle ◽  
Statistical Evidence ◽  
Solar Energetic Particle Events

scholarly journals Abundance Enhancements in Impulsive Solar Energetic-Particle Events with Associated Coronal Mass Ejections

Solar Physics ◽  
2014 ◽  
Vol 289 (10) ◽  
pp. 3817-3841 ◽  
Author(s):  
Donald V. Reames ◽  
Edward W. Cliver ◽  
Stephen W. Kahler
Keyword(s):  
Coronal Mass Ejections ◽  
Energetic Particle ◽  
Solar Energetic Particle ◽  
Solar Energetic Particle Events
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