INTERFERENCE of the RUNNING WAVES at LIGHT BRIDGES of A SUNSPOT

J. T. Su, K. F. Ji, D. Banerjee, Wenda Cao, T. G. Priya, J. S. Zhao, Sijie Yu, H. S. Ji, M. Zhang

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

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.

Original languageEnglish (US)
Article number30
JournalAstrophysical Journal
Volume816
Issue number1
DOIs
StatePublished - Jan 1 2016

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Sun: chromosphere
  • Sun: magnetic fields
  • Sun: oscillations
  • sunspots Supporting material: animation

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