Observations of Sunspot Oscillations in G band and Ca II H line with Solar Optical Telescope on Hinode

Details Observations of Sunspot Oscillations in G band and Ca II H line with Solar Optical Telescope on Hinode Observations of Sunspot Oscillations in G band and Ca II H line with Solar Optical Telescope on Hinode

2007-09-05

arxiv.org/abs/0709.0569v1

Publ.Astron.Soc.Jap.59:S631-S636,2007

Astronomy and Astrophysics

Astrophysics

7 pages, 8 figures, accepted for publication in PASJ (Hinode Special Issue)

Scientific paper

Exploiting high-resolution observations made by the Solar Optical Telescope onboard Hinode, we investigate the spatial distribution of power spectral density of oscillatory signal in and around NOAA active region 10935. The G-band data show that in the umbra the oscillatory power is suppressed in all frequency ranges. On the other hand, in Ca II H intensity maps oscillations in the umbra, so-called umbral flashes, are clearly seen with the power peaking around 5.5 mHz. The Ca II H power distribution shows the enhanced elements with the spatial scale of the umbral flashes over most of the umbra but there is a region with suppressed power at the center of the umbra. The origin and property of this node-like feature remain unexplained.

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