High-frequency oscillations in a solar active region observed with the RAPID DUAL IMAGER

D.B. Jess, A. Andic, M. Mathioudakis, D. S. Bloomfield, F. P. Keenan

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30 Citations (Scopus)

Abstract

High-cadence, synchronized, multiwavelength optical observations of a solar active region (NOAA 10794) are presented. The data were obtained with the Dunn Solar Telescope at the National Solar Observatory/Sacramento Peak using a newly developed camera system: the rapid dual imager. Wavelet analysis is undertaken to search for intensity related oscillatory signatures, and periodicities ranging from 20 to 370 s are found with significance levels exceeding 95%. Observations in the H-α blue wing show more penumbral oscillatory phenomena when compared to simultaneous G-band observations. The H-α oscillations are interpreted as the signatures of plasma motions with a mean velocity of 20 km s-1. The strong oscillatory power over H-α blue-wing and G-band penumbral bright grains is an indication of the Evershed flow with frequencies higher than previously reported.
Original languageEnglish
Pages (from-to)943-950
JournalAstronomy and Astrophysics
Volume473
DOIs
Publication statusPublished - Oct 2007

Keywords

  • instrumentation: miscellaneous
  • waves
  • Sun: chromosphere
  • Sun: oscillations
  • Sun: photosphere
  • Sun: sunspots

ASJC Scopus subject areas

  • Space and Planetary Science

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