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dc.contributor.authorTian, Hui
dc.contributor.authorYoung, Peter R.
dc.contributor.authorReeves, Katharine K.
dc.contributor.authorWang, Tongjiang
dc.contributor.authorAntolin, Patrick
dc.contributor.authorChen, Bin
dc.contributor.authorHe, Jiansen
dc.date.accessioned2017-01-20T17:30:09Z
dc.date.available2017-01-20T17:30:09Z
dc.date.issued2016-05-20
dc.identifier.citationTian , H , Young , P R , Reeves , K K , Wang , T , Antolin , P , Chen , B & He , J 2016 , ' Global sausage oscillation of solar flare loops detected by the Interface Region Imaging Spectrograph ' , Astrophysical Journal Letters , vol. 823 , no. 1 , L16 . https://doi.org/10.3847/2041-8205/823/1/L16en
dc.identifier.issn2041-8205
dc.identifier.otherPURE: 248969025
dc.identifier.otherPURE UUID: 5f7951a5-488b-403b-9273-7bdc81dbe002
dc.identifier.otherBibCode: 2016ApJ...823L..16T
dc.identifier.otherScopus: 84971576972
dc.identifier.urihttps://hdl.handle.net/10023/10140
dc.description.abstractAn observation from the Interface Region Imaging Spectrograph reveals coherent oscillations in the loops of an M1.6 flare on 2015 March 12. Both the intensity and Doppler shift of Fe xxi 1354.08 Å show clear oscillations with a period of ˜25 s. Remarkably similar oscillations were also detected in the soft X-ray flux recorded by the Geostationary Operational Environmental Satellites (GOES). With an estimated phase speed of ˜2420 km s-1 and a derived electron density of at least 5.4 × 1010cm-3, the observed short-period oscillation is most likely the global fast sausage mode of a hot flare loop. We find a phase shift of ˜π/2 (1/4 period) between the Doppler shift oscillation and the intensity/GOES oscillations, which is consistent with a recent forward modeling study of the sausage mode. The observed oscillation requires a density contrast between the flare loop and coronal background of a factor ≥42. The estimated phase speed of the global mode provides a lower limit of the Alfvén speed outside the flare loop. We also find an increase of the oscillation period,which might be caused by the separation of the loop footpoints with time.
dc.format.extent7
dc.language.isoeng
dc.relation.ispartofAstrophysical Journal Lettersen
dc.rights© American Astronomical Society 2016. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at iopscience.iop.org / http://dx.doi.org/10.3847/2041-8205/823/1/L16en
dc.subjectLine: profilesen
dc.subjectMagnetic reconnectionen
dc.subjectSun: coronaen
dc.subjectSun: flaresen
dc.subjectSun: oscillationsen
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.subjectNDASen
dc.subject.lccQBen
dc.subject.lccQCen
dc.titleGlobal sausage oscillation of solar flare loops detected by the Interface Region Imaging Spectrographen
dc.typeJournal articleen
dc.description.versionPostprinten
dc.contributor.institutionUniversity of St Andrews. Applied Mathematicsen
dc.identifier.doihttps://doi.org/10.3847/2041-8205/823/1/L16
dc.description.statusPeer revieweden
dc.identifier.urlhttps://arxiv.org/abs/1605.01963v1en
dc.identifier.urlhttp://adsabs.harvard.edu/abs/2016ApJ...823L..16Ten


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