Formation Of Coronal Mhd Shock Waves – I. The Basic Mechanism
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摘要: The formation and evolution of a large amplitude MHD perturbation propagating perpendicular to the magnetic field in perfectly conducting low β plasma is studied. generated by an abrupt expansion source region. Explicit expressions for time distance needed transformation perturbation's leading edge into shock wave are derived. results applied coronal conditions dynamic spectra radio emission excited synthesized, reproducing metric kilometric type II bursts. features corresponding burst precursor moving IV case bursts identified. A specific signature that sometimes observed at onset found appear immediately before due associated growth gradient. Time delays starting frequencies bursts' onsets calculated presented as function impulsiveness source-region expansion, using different values ambient Alfven velocity various profiles velocity. confronted with observations solar
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