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Quasi-periodic pulsations in the gamma-ray emission of a solar flare
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Nakariakov, V. M. (Valery M.), Foullon, C. (Claire), Myagkova, I. N. and Inglis, Andrew R. (2010) Quasi-periodic pulsations in the gamma-ray emission of a solar flare. Astrophysical Journal Letters, Vol.708 (No.1). L47-L51. doi:10.1088/2041-8205/708/1/L47
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Official URL: http://dx.doi.org/10.1088/2041-8205/708/1/L47
Abstract
Quasi-periodic pulsations (QPPs) of gamma-ray emission with a period of about 40 s are found in a single loop X-class solar flare on 2005 January 1 at photon energies up to 2-6 MeV with the SOlar Neutrons and Gamma-rays (SONG) experiment aboard the CORONAS-F mission. The oscillations are also found to be present in the microwave emission detected with the Nobeyama Radioheliograph, and in the hard X-ray and low energy gamma-ray channels of RHESSI. Periodogram and correlation analysis shows that the 40 s QPPs of microwave, hard X-ray, and gamma-ray emission are almost synchronous in all observation bands. Analysis of the spatial structure of hard X-ray and low energy (80-225 keV) gamma-ray QPP with RHESSI reveals synchronous while asymmetric QPP at both footpoints of the flaring loop. The difference between the averaged hard X-ray fluxes coming from the two footpoint sources is found to oscillate with a period of about 13 s for five cycles in the highest emission stage of the flare. The proposed mechanism generating the 40 s QPP is a triggering of magnetic reconnection by a kink oscillation in a nearby loop. The 13 s periodicity could be produced by the second harmonics of the sausage mode of the flaring loop.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QB Astronomy | ||||
| Divisions: | Faculty of Science > Physics | ||||
| Library of Congress Subject Headings (LCSH): | Solar oscillations, Solar flares, X-ray bursts | ||||
| Journal or Publication Title: | Astrophysical Journal Letters | ||||
| Publisher: | IOP Publishing Ltd | ||||
| ISSN: | 2041-8213 | ||||
| Official Date: | 1 January 2010 | ||||
| Dates: |
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| Volume: | Vol.708 | ||||
| Number: | No.1 | ||||
| Number of Pages: | 5 | ||||
| Page Range: | L47-L51 | ||||
| DOI: | 10.1088/2041-8205/708/1/L47 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
Data sourced from Thomson Reuters' Web of Knowledge
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