From Gigahertz to Millihertz: A Multiwavelength Study of the Acoustically Active 14 August 2004 M7.4 Solar Flare |
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| Authors: | J C Martínez-Oliveros H Moradi D Besliu-Ionescu A-C Donea P S Cally C Lindsey |
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| Institution: | (1) Centre for Stellar and Planetary Astrophysics, School of Mathematical Sciences, Monash University, Melbourne, Australia;(2) Astronomical Institute of the Romanian Academy, Bucharest, Romania;(3) Northwest Research Associates, CORA Div. 3380 Mitchell Lane, Boulder, CO 80301, USA |
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| Abstract: | We carried out an electromagnetic acoustic analysis of the solar flare of 14 August 2004 in active region AR10656 from the
radio to the hard X-ray spectrum. The flare was a GOES soft X-ray class M7.4 and produced a detectable sun quake, confirming
earlier inferences that relatively low energy flares may be able to generate sun quakes. We introduce the hypothesis that
the seismicity of the active region is closely related to the heights of coronal magnetic loops that conduct high-energy particles
from the flare. In the case of relatively short magnetic loops, chromospheric evaporation populates the loop interior with
ionised gas relatively rapidly, expediting the scattering of remaining trapped high-energy electrons into the magnetic loss
cone and their rapid precipitation into the chromosphere. This increases both the intensity and suddenness of the chromospheric
heating, satisfying the basic conditions for an acoustic emission that penetrates into the solar interior. |
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