UNSPECIFIED. (2004) Flare-generated acoustic oscillations in solar and stellar coronal loops. ASTRONOMY & ASTROPHYSICS, 422 (1). pp. 351-355. ISSN 0004-6361

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Abstract

Long period longitudinal oscillations of a flaring coronal loop are studied numerically. In the recent work of Nakariakov et al. (2004) it has been shown that the time dependence of density and velocity in a flaring loop contain pronounced quasi-harmonic oscillations associated with the 2nd harmonic of a standing slow magnetoacoustic wave. In this work we investigate the physical nature of these oscillations in greater detail, namely, their spectrum (using the periodogram technique) and how heat positioning affects mode excitation. We found that excitation of such oscillations is practically independent of the location of the heat deposition in the loop. Because of the change of the background temperature and density, the phase shift between the density and velocity perturbations is not exactly a quarter of the period; it varies along the loop and is time dependent, especially in the case of one footpoint (asymmetric) heating.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Journal or Publication Title:	ASTRONOMY & ASTROPHYSICS
Publisher:	E D P SCIENCES
ISSN:	0004-6361
Date:	July 2004
Volume:	422
Number:	1
Number of Pages:	5
Page Range:	pp. 351-355
Identification Number:	10.1051/0004-6361:20040299
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/8145

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