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Determination of the coronal magnetic field by coronal loop oscillations

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Nakariakov, Valery M. and Ofman, L. (Leon). (2001) Determination of the coronal magnetic field by coronal loop oscillations. Astronomy & Astrophysics, Vol.372 (No.3). L53-L56. ISSN 0004-6361

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Official URL: http://dx.doi.org/10.1051/0004-6361:20010607

Abstract

We develop a new method for the determination of the absolute value of the magnetic field strength in coronal closed magnetic structures, based on the analysis of flare-generated oscillations of coronal loops. Interpretation of the oscillations observed in terms of global standing kink waves allows to connect the period of the oscillations and the loops length with the magnetic field strength in the loops. For loop oscillations observed with TRACE on 14th July 1998 and 4th July 1999, we estimate the magnetic field strength as 4-30 G. Using TRACE 171 Å and 195 Å images of the loop, taken on 4th July 1999 to determine the plasma density, we estimate the magnetic field in the loop as 13 +- 9 G. Improved diagnostic of the loop length, the oscillation period, and the plasma density in the loop will significantly improve the method's precision.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Sun -- Loop prominences, Sun -- Corona -- Magnetic fields, Magnetohydrodynamic waves, Solar oscillations
Journal or Publication Title:	Astronomy & Astrophysics
Publisher:	EDP Sciences
ISSN:	0004-6361
Date:	June 2001
Volume:	Vol.372
Number:	No.3
Page Range:	L53-L56
Identification Number:	10.1051/0004-6361:20010607
Status:	Peer Reviewed
Access rights to Published version:	Open Access
Funder:	United States. National Aeronautics and Space Administration (NASA)
Grant number:	NASW-98004 (NASA)
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URI:	http://wrap.warwick.ac.uk/id/eprint/3821