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Cylindrical and spherical pistons as drivers of MHD shocks (CROSBI ID 644270)

Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija

Žic, Tomislav ; Vršnak, Bojan ; Temmer, Manuela Cylindrical and spherical pistons as drivers of MHD shocks. 2007

Podaci o odgovornosti

Žic, Tomislav ; Vršnak, Bojan ; Temmer, Manuela

engleski

Cylindrical and spherical pistons as drivers of MHD shocks

We consider expanding cylindrical and spherical structures as drivers of MHD shock waves. It is assumed that the source surface accelerates over a certain time interval to achieve a particular maximum velocity. Such an expansion creates a large amplitude simple wave in the ambient plasma. Due to the nonlinear evolution of the wave front, its profile steepens and after a certain time/distance a discontinuity forms, marking the onset of the shock formation. We investigate how the time/distance needed for the shock formation depends on various input parameters: the acceleration phase duration, maximum expansion velocity (defining also acceleration), Alfvén velocity (defining also Mach number), initial size of the piston. The model is an extension of the 1- dimensional model by Vršnak and Lulić [2000] ; the basic difference lies in the fact that in the 3D evolution, a decrease of the wave amplitude with distance must be taken into account. We present basic results, focusing on the timing of the shock formation in the low versus high plasma beta environment. Implications for the coronal conditions are discussed.

Shock waves ; magnetohydrodynamics (MHD) ; Sun: corona ; Sun: coronal mass ejections (CMEs) ; Sun: flares

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Podaci o prilogu

2007.

objavljeno

Podaci o matičnoj publikaciji

Podaci o skupu

CESRA Workshop on "Solar Radio Physics and the Flare-CME Relationship"

predavanje

12.06.2007-16.06.2007

Janjina, Grčka

Povezanost rada

Fizika