Time-dependent Suppression of Oscillatory Power in Evolving Solar Magnetic Fields

S. Krishna Prasad, D. B. Jess, R. Jain, P. H. Keys

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Abstract

Oscillation amplitudes are generally smaller within magnetically active regions like sunspots and plage when compared to their surroundings. Such magnetic features, when viewed in spatially resolved power maps, appear as regions of suppressed power due to reductions in the oscillation amplitudes. Employing high spatial- and temporal-resolution observations from the Dunn Solar Telescope (DST) in New Mexico, we study the power suppression in a region of evolving magnetic fields adjacent to a pore. By utilizing wavelet analysis, we study for the first time how the oscillatory properties in this region change as the magnetic field evolves with time. Image sequences taken in the blue continuum, G-band, Ca ii K, and Hα filters were used in this study. It is observed that the suppression found in the chromosphere occupies a relatively larger area, confirming previous findings. Also, the suppression is extended to structures directly connected to the magnetic region, and is found to get enhanced as the magnetic field strength increased with time. The dependence of the suppression on the magnetic field strength is greater at longer periods and higher formation heights. Furthermore, the dominant periodicity in the chromosphere was found to be anti-correlated with increases in the magnetic field strength.
Original languageEnglish
Article number45
Number of pages15
JournalThe Astrophysical Journal
Volume823
Issue number1
DOIs
Publication statusPublished - 20 May 2016

Keywords

  • Sun: chromosphere
  • Sun: evolution
  • Sun: magnetic fields
  • Sun: oscillations
  • Sun: photosphere

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