Van Doorsselaere, Tom, Ruderman, M. S. and Robertson, D. (2008) Transverse oscillations of two parallel coronal loops. Astronomy & Astrophysics, Vol.485 (No.3). pp. 849-857. doi:10.1051/0004-6361:200809841 ISSN 0004-6361.

PDF WRAP_Van_Doorsselaere_41_transverse_oscillations_aa09841-08.pdf - Requires a PDF viewer. Download (425Kb)

Request Changes to record.

Abstract

Context. Collective oscillations of two or more coronal magnetic loops are observed very often.
Aims. We study the eigenmodes of oscillations of a system consisting of two parallel magnetic loops.
Methods. The linearised MHD equations for a cold plasma are solved analytically in bicylindrical coordinates using the longwavelength approximation. A dispersion equation determining the frequencies of eigenmodes is derived and solved analytically.
Results. Two solutions of the dispersion relation were found. The higher frequency corresponds to the antisymmetric mode polarised in the direction parallel to the line connecting the loop centres, and the symmetric mode polarised in the perpendicular direction.
Depending on the polarisation of modes corresponding to the lower frequency, the systems of two parallel loops are classified as standard and anomalous. In standard systems the lower frequency corresponds to the symmetric mode polarised in the direction parallel to the line connecting the loop centres, and the antisymmetric mode polarised in the perpendicular direction. In anomalous systems
the lower frequency corresponds to the antisymmetric mode polarised in the direction parallel to the line connecting the loop centres, and the symmetric mode polarised in the perpendicular direction. The limiting case of two identical loops is studied. The results for this case are compared with recent numerical results.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH):	Sun -- Corona -- Magnetic fields, Solar oscillations, Sun -- Loop prominences, Magnetohydrodynamics
Journal or Publication Title:	Astronomy & Astrophysics
Publisher:	EDP Sciences
ISSN:	0004-6361
Official Date:	July 2008
Dates:	Date Event July 2008 Published
Volume:	Vol.485
Number:	No.3
Page Range:	pp. 849-857
DOI:	10.1051/0004-6361:200809841
Status:	Peer Reviewed
Access rights to Published version:	Open Access (Creative Commons)
Funder:	Science and Technology Facilities Council (Great Britain) (STFC)

Data sourced from Thomson Reuters' Web of Knowledge

Request changes or add full text files to a record

Repository staff actions (login required)

View Item

Downloads