Downloads: 118

Files in This Item:
File Description SizeFormat 
0004-637X_801_1_37.pdf3.78 MBAdobe PDFView/Open
Authors: Takahashi, Takuya
Asai, Ayumi  kyouindb  KAKEN_id  orcid (unconfirmed)
Shibata, Kazunari
Author's alias: 高橋, 卓也
Keywords: magnetohydrodynamics (MHD)
shock waves
Sun: corona
Sun: filaments, prominences
Sun: flares
Issue Date: 27-Feb-2015
Publisher: American Astronomical Society
Journal title: The Astrophysical Journal
Volume: 801
Issue: 1
Thesis number: 37
Abstract: An X5.4 class flare occurred in active region NOAA11429 on 2012 March 7. The flare was associated with a very fast coronal mass ejection (CME) with a velocity of over 2500 km s[−1]. In the images taken with the Solar Terrestrial Relations Observatory-B/COR1, a dome-like disturbance was seen to detach from an expanding CME bubble and propagated further. A Type-II radio burst was also observed at the same time. On the other hand, in extreme ultraviolet images obtained by the Solar Dynamic Observatory/Atmospheric Imaging Assembly (AIA), the expanding dome-like structure and its footprint propagating to the north were observed. The footprint propagated with an average speed of about 670 km s[−1] and hit a prominence located at the north pole and activated it. During the activation, the prominence was strongly brightened. On the basis of some observational evidence, we concluded that the footprint in AIA images and the ones in COR1 images are the same, that is, the MHD fast mode shock front. With the help of a linear theory, the fast mode Mach number of the coronal shock is estimated to be between 1.11 and 1.29 using the initial velocity of the activated prominence. Also, the plasma compression ratio of the shock is enhanced to be between 1.18 and 2.11 in the prominence material, which we consider to be the reason for the strong brightening of the activated prominence. The applicability of linear theory to the shock problem is tested with a nonlinear MHD simulation.
Rights: © 2015. The American Astronomical Society.
DOI(Published Version): 10.1088/0004-637X/801/1/37
Appears in Collections:Journal Articles

Show full item record

Export to RefWorks

Export Format: 

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.