UNSPECIFIED (2002) Slow magnetoacoustic waves in coronal loops. In: 10th European Solar Physics Meeting, PRAGUE, CZECH REPUBLIC, SEP 09-14, 2002. Published in: SOLAR VARIABILITY: FROM CORE TO OUTER FRONTIERS, VOLS 1 & 2, 506 pp. 705-708.

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Abstract

Propagating disturbances of EUV emission, recently discovered in coronal loops with SOHO/EIT and TRACE, are interpreted as slow magnetoacoustic waves. This interpretation is based upon several observational findings: (a) the disturbances seem to propagate along the magnetic field (b) at a constant speed which is below the estimated sound speed, (c) the perturbations are compressible, (d) the periods are shorter than the acoustic cut-off period in the corona. A theoretical model describing the wave evolution and incorporating effects of dissipation, stratification and weak nonlinearity is created. In particular, the model explains why only the upwardly propagating waves are observed. The interpretation suggested is in a good agreement with observational findings. It is shown that wide spectrum slow magnetoacoustic waves, consistent with currently available observations in the low frequency part of the spectrum, can provide the rate of heat deposition sufficient to heat the loop. In this scenario, the heat would be deposited near the loop footpoints which also agrees with the current observational data. The analysis of simultaneous observations of propagating EUV disturbances in 171Angstrom and 195Angstrom bandpasses of TRACE telescope shows high correlation which systematically decreases with the distance along the loop.

Item Type:	Conference Item (UNSPECIFIED)
Subjects:	Q Science > QB Astronomy
Series Name:	ESA SPECIAL PUBLICATIONS
Journal or Publication Title:	SOLAR VARIABILITY: FROM CORE TO OUTER FRONTIERS, VOLS 1 & 2
Publisher:	EUROPEAN SPACE AGENCY
ISBN:	92-9092-816-6
ISSN:	0379-6566
Date:	2002
Volume:	506
Number of Pages:	4
Page Range:	pp. 705-708
Publication Status:	Published
Title of Event:	10th European Solar Physics Meeting
Location of Event:	PRAGUE, CZECH REPUBLIC
Date(s) of Event:	SEP 09-14, 2002
URI:	http://wrap.warwick.ac.uk/id/eprint/9003

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