Journal
ASTRONOMY & ASTROPHYSICS
Volume 473, Issue 3, Pages 943-950Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20077142
Keywords
instrumentation : miscellaneous; waves; sun : chromosphere; sun : oscillations; sun : photosphere; sun : sunspots
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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-alpha blue wing show more penumbral oscillatory phenomena when compared to simultaneous G-band observations. The H-alpha oscillations are interpreted as the signatures of plasma motions with a mean velocity of 20 km s(-1). The strong oscillatory power over H-a blue-wing and G-band penumbral bright grains is an indication of the Evershed flow with frequencies higher than previously reported.
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