A multi-periodic oscillatory event in a solar flare
Inglis, Andrew R. and Nakariakov, V. M. (Valery M.). (2009) A multi-periodic oscillatory event in a solar flare. Astronomy & Astrophysics, Vol.493 (No.1). pp. 259-266. ISSN 0004-6361
WRAP_Nakariakov_33_multi-periodic_aa10473-08.pdf - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
Official URL: http://dx.doi.org/10.1051/0004-6361:200810473
Aims. Ratios of different significant periods found in the light curves of a solar flare exhibiting quasi-periodic pulsations (QPP) are used to distinguish between the possible physical mechanisms responsible for such periodic behaviour.
Methods. Time series data of the flaring event of 2002 July 3, observed via the Nobeyama Radioheliograph, Nobeyama
Radiopolarimeters, and the RHESSI satellite, are investigated with the use of the Lomb-Scargle periodogram technique. Images of the event are also recovered via the RHESSI, SOHO, and Nobeyama Radioheliograph instruments.
Results. Statistical analysis of the Lomb-Scargle periodogram results indicates three distinct periods above the 99% confidence level in Nobeyama Radioheliograph and Radiopolarimeter data, at 28 s, 18 s, and 12 s, respectively. The two longest of these periods were
also observed in the RHESSI data at the same confidence level. Wavelet analysis demonstrated that multiple periods occurred simultaneously without any significant frequency shift over time. Reconstructed images of the event reveal a very compact flare structure unsuitable for spatially resolved analysis. Consideration of the period ratios leads to the conclusion that the cause of this multi-periodic
event is likely to be a kink mode periodically triggering magnetic reconnection.
|Item Type:||Journal Article|
|Subjects:||Q Science > QB Astronomy|
|Divisions:||Faculty of Science > Physics|
|Library of Congress Subject Headings (LCSH):||Solar flares, Solar oscillations, Magnetohydrodynamics, Sun -- Corona, Light curves|
|Journal or Publication Title:||Astronomy & Astrophysics|
|Publisher:||E D P Sciences|
|Official Date:||January 2009|
|Page Range:||pp. 259-266|
|Access rights to Published version:||Open Access|
|Funder:||Royal Society (Great Britain), Science and Technology Facilities Council (Great Britain) (STFC), Royal Society (Great Britain). British-Russian Research Collaboration|
Andries, J., Arregui, I., & Goossens, M. 2005, ApJ, 624, L57
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