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Direct Detection of a CME-Associated Shock in LASCO White Light Images | | A. Vourlidas
; S. T. Wu
; A. H. Wang
; P. Subramanian
; R. A. Howard
; | | Date: |
21 Aug 2003 | | Journal: | Astrophys.J. 598 (2003) 1392-1402 | | Subject: | astro-ph | | Affiliation: | NRL, Washington DC, USA), S. T. Wu and A. H. Wang (U. Alabama, Huntsville, AL, USA), P. Subramanian (IUCAA, Pune, India) and R. A. Howard (NRL, Washington DC, USA | | Abstract: | The LASCO C2 and C3 coronagraphs recorded a unique coronal mass ejection on April 2, 1999. The event did not have the typical three-part CME structure and involved a small filament eruption without any visibile overlying streamer ejecta. The event exhibited an unusually clear signature of a wave propagating at the CME flanks. The speed and density of the CME front and flanks were consistent with the existence of a shock. To better establish the nature of the white light wave signature, we employed a simple MHD simulation using the LASCO measurements as constraints. Both the measurements and the simulation strongly suggest that the white light feature is the density enhancement from a fast-mode MHD shock. In addition, the LASCO images clearly show streamers being deflected when the shock impinges on them. It is the first direct imaging of this interaction. | | Source: | arXiv, astro-ph/0308367 | | Services: | Forum | Review | PDF | Favorites | |
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