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Interference of the running waves at light bridges of a sunspot

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dc.contributor.author Su, J. T
dc.contributor.author Ji, K. F
dc.contributor.author Banerjee, D
dc.contributor.author Cao, W. D
dc.contributor.author Priya, T. G
dc.contributor.author Zhao, J. S
dc.contributor.author Yu, S. J
dc.contributor.author Ji, H. S
dc.contributor.author Zhang, M
dc.date.accessioned 2020-11-17T11:55:31Z
dc.date.available 2020-11-17T11:55:31Z
dc.date.issued 2016-01-01
dc.identifier.citation The Astrophysical Journal, Vol. 816, No. 1, 30 en_US
dc.identifier.issn 0004-637X
dc.identifier.uri http://prints.iiap.res.in/handle/2248/7060
dc.description Restricted Access © The American Astronomical Society http://dx.doi.org/10.3847/0004-637X/816/1/30 en_US
dc.description.abstract The observations of chromospheric oscillations of two umbral light bridges (LBs) within a sunspot from NOAA Active Region 12127 are presented. It was found that the running umbral waves with periods of 2.2–2.6 minutes underwent very fast damping before approaching umbral boundaries, while those with higher periods (>2.6 minutes) could propagate outside umbrae. On two sides of each LB adjacent to umbrae, the cross-wavelet spectra displayed that the oscillations on them had a common significant power region with dominant frequencies of 2–6 minutes and phase differences of ~90°. A counterstream of two running umbral waves in the 2–6 minute frequency range propagated toward the LBs, where they encountered each other and gave rise to constructive or even destructive interference on the LBs. In addition, the velocity and density perturbations on the LBs were found in opposite phases suggesting that the perturbations were caused by the downward propagating waves. en_US
dc.language.iso en en_US
dc.publisher IOP Publishing en_US
dc.subject Sun: chromosphere en_US
dc.subject Sun: magnetic fields en_US
dc.subject Sun: oscillations en_US
dc.subject Sun: oscillations en_US
dc.title Interference of the running waves at light bridges of a sunspot en_US
dc.type Article en_US


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