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Detection of three periodicities in a single oscillating coronal loop

Detection of three periodicities in a single oscillating coronal loop
Detection of three periodicities in a single oscillating coronal loop
Context. TRACE $171~\AA{}$ observations of transverse loop oscillations on May 13, 2001 have been studied by De Moortel & Brady (2007). They found hints of 3 periodicities present in this event.

Aims. The aim of this article is to improve the analysis, and measure the periodicities more accurately in order to do coronal seismology.

Methods. We create multiple (x,t)-slices across the loop, and determine the oscillatory parameters within those slices. We then use statistical methods to reduce the errors on the measured oscillations parameters.

Results. We find two populations with a clearly distinct period. The population at the loop top has a period of $895\pm2~{\rm s}$, while the population in the loop leg has a period of $452\pm1~{\rm s}$. The fact that the ratio of these two periods is roughly 2 and the geometry of the problem suggests that two harmonics are observed. In the residues, we confirm the presence of a 3rd harmonic with period $309\pm15~{\rm s}$ using two separate data analysis techniques. The three periods are then used to do a seismological estimate of the loop expansion and the density scale height.
magnetohydrodynamics (MHD) - Sun: corona - Sun: oscillations
0004-6361
1485-1491
Van Doorsselaere, T.
54b9406e-9b06-45c3-a8e9-6b31d9f691bd
Birtill, D.C.C.
2284e119-524b-4d52-85e8-dcf77359610c
Evans, G.R.
df904bd4-7783-4b66-bab5-89865a95634d
Van Doorsselaere, T.
54b9406e-9b06-45c3-a8e9-6b31d9f691bd
Birtill, D.C.C.
2284e119-524b-4d52-85e8-dcf77359610c
Evans, G.R.
df904bd4-7783-4b66-bab5-89865a95634d

Van Doorsselaere, T., Birtill, D.C.C. and Evans, G.R. (2009) Detection of three periodicities in a single oscillating coronal loop. Astronomy & Astrophysics, 508 (3), 1485-1491. (doi:10.1051/0004-6361/200912753).

Record type: Article

Abstract

Context. TRACE $171~\AA{}$ observations of transverse loop oscillations on May 13, 2001 have been studied by De Moortel & Brady (2007). They found hints of 3 periodicities present in this event.

Aims. The aim of this article is to improve the analysis, and measure the periodicities more accurately in order to do coronal seismology.

Methods. We create multiple (x,t)-slices across the loop, and determine the oscillatory parameters within those slices. We then use statistical methods to reduce the errors on the measured oscillations parameters.

Results. We find two populations with a clearly distinct period. The population at the loop top has a period of $895\pm2~{\rm s}$, while the population in the loop leg has a period of $452\pm1~{\rm s}$. The fact that the ratio of these two periods is roughly 2 and the geometry of the problem suggests that two harmonics are observed. In the residues, we confirm the presence of a 3rd harmonic with period $309\pm15~{\rm s}$ using two separate data analysis techniques. The three periods are then used to do a seismological estimate of the loop expansion and the density scale height.

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More information

Published date: 2009
Keywords: magnetohydrodynamics (MHD) - Sun: corona - Sun: oscillations
Organisations: Physical Oceanography

Identifiers

Local EPrints ID: 346179
URI: https://eprints.soton.ac.uk/id/eprint/346179
ISSN: 0004-6361
PURE UUID: 9d789088-f13d-4825-bf1a-8a328159a288

Catalogue record

Date deposited: 13 Dec 2012 10:44
Last modified: 18 Jul 2017 05:05

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