Naslov
Origin of Coronal Shock Waves

Autori
Vršnak, Bojan ; Cliver, Edward

Izvornik
Solar Physics (0038-0938) 253 (2008), 1-2; 215-235

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Shock waves; Magnetohydrodynamics (MHD); Sun: corona; Sun: coronal mass ejections (CMEs); Sun: flares

Sažetak
The basic idea of the paper is to present transparently and confront two different views on the origin of large-scale coronal shock waves, one favoring coronal mass ejections (CMEs), and the other one preferring flares. For this purpose, we first review the empirical aspects of the relationship between CMEs, flares, and shocks (as manifested by radio type II bursts andMoreton waves). Then, various physical mechanisms capable of launching MHD shocks are presented. In particular, we describe the shock wave formation caused by a three-dimensional piston, driven either by the CME expansion or by a flare-associated pressure pulse. Bearing in mind this theoretical framework, the observational characteristics of CMEs and flares are revisited to specify advantages and drawbacks of the two shock formation scenarios. Finally, we emphasize the need to document clear examples of flare-ignited large-scale waves to give insight on the relative importance of flare and CME generation mechanisms for type II bursts/Moreton waves.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA