The Library
Detection of three periodicities in a single oscillating coronal loop
Tools
Van Doorsselaere, Tom, Birtill, D. C. C. and Evans, G. R. (2009) Detection of three periodicities in a single oscillating coronal loop. Astronomy & Astrophysics, Vol.508 (No.3). pp. 1485-1491. doi:10.1051/0004-6361/200912753 ISSN 0004-6361.
PDF
WRAP_Van_Doorsselaere_13_detection_aa12753-09[1].pdf - Requires a PDF viewer. Download (5Mb) |
Official URL: http://dx.doi.org/10.1051/0004-6361/200912753
Abstract
Context. TRACE 171 Å 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 ± 2 s, while the population in the loop leg has a period of 452 ± 1 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 ± 15 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.
Item Type: | Journal Article | ||||
---|---|---|---|---|---|
Subjects: | Q Science > QB Astronomy | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Library of Congress Subject Headings (LCSH): | Magnetohydrodynamics, Solar oscillations, Sun -- Corona, Sun -- Loop prominences | ||||
Journal or Publication Title: | Astronomy & Astrophysics | ||||
Publisher: | EDP Sciences | ||||
ISSN: | 0004-6361 | ||||
Official Date: | December 2009 | ||||
Dates: |
|
||||
Volume: | Vol.508 | ||||
Number: | No.3 | ||||
Page Range: | pp. 1485-1491 | ||||
DOI: | 10.1051/0004-6361/200912753 | ||||
Status: | Peer Reviewed | ||||
Access rights to Published version: | Open Access (Creative Commons) | ||||
Funder: | Seventh Framework Programme (European Commission) (FP7) | ||||
Grant number: | 220555 (FP7) |
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
Downloads per month over past year