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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:19 |
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Conference: Bucharest University Faculty of Physics 2012 Meeting
Section: Atomic and Molecular Physics; Astrophysics
Title:
The sunquake associated with a Moreton wave
Authors:
Diana BESLIU-IONESCU (1,2), Marilena MIERLA (1,3), Georgeta MARIS (1)
Affiliation:
(1) Institute of Geodynamics "Sabba S Stefanescu" Bucharest, Romania.
(2) MoCA, School of Mathematical Sciences, Monash University, Clayton, Victoria, Australia.
(3) Research Center for Atomic Physics and Astrophysics, Faculty of Physics, University of Bucharest, Romania.
(4) Royal Observatory of Belgium, Brussels, Belgium.
E-mail
diana.besliu@gmail.com
Keywords:
solar flare, sunquake, Moreton wave
Abstract:
Some solar flares can release acoustic transients into the solar subsurface of the active regions that host them. Most of the acoustic power in these transients propagates something like 10-30 Mm beneath the photosphere before it is refracted back to the surface, where it raises a significant disturbance. In the strongest of these "sunquakes", the manifestation of this transient in helioseismic movies is an outwardly expanding surface ripple that becomes conspicuous about 20 minutes after the impulsive phase of the flare. Sunquakes offer a powerful diagnostic of wave propagation in the active region photosphere and of the structure and dynamics of the subphotosphere.On September 13, 2005 an X1.5 flare erupted above the \beta\gamma\delta AR NOAA 10808. The integrated GOES flux started to increase at 19:19 UT, reached the peak at 19:27 and ended one and a half hour later. Concomitant with this fast rising ascending phase we discovered a sun quake that had its maximum at 19:22 UT. We will show and discuss the associated Moreton Wave as well as possible connection in between these emissions.
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