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Title:
Observations of Sunspot Oscillations in G Band and CaII H Line with Solar Optical Telescope on Hinode
Authors:
Nagashima, Kaori; Sekii, Takashi; Kosovichev, Alexander G.; Shibahashi, Hiromoto; Tsuneta, Saku; Ichimoto, Kiyoshi; Katsukawa, Yukio; Lites, Bruce; Nagata, Shin'ichi; Shimizu, Toshifumi; Shine, Richard A.; Suematsu, Yoshinori; Tarbell, Theodore D.; Title, Alan M.
Affiliation:
AA(Department of Astronomical Science, The Graduate University for Advanced Studies (Sokendai), National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588 ), AB(Department of Astronomical Science, The Graduate University for Advanced Studies (Sokendai), National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588; National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588), AC(W.W. Hansen Experimental Physics Laboratory, Stanford University, 452 Lomita Mall, Stanford, CA 94305-4085, USA), AD(Department of Astronomy, School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033), AE(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588), AF(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588), AG(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588), AH(High Altitude Observatory, National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307, USA), AI(Hida Observatory, Kyoto University, Takayama, Gifu 506-1314), AJ(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510), AK(Lockheed Martin Solar and Astrophysics Laboratory, B/252, 3251 Hanover St., Palo Alto, CA 94304, USA), AL(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588), AM(Lockheed Martin Solar and Astrophysics Laboratory, B/252, 3251 Hanover St., Palo Alto, CA 94304, USA), AN(Lockheed Martin Solar and Astrophysics Laboratory, B/252, 3251 Hanover St., Palo Alto, CA 94304, USA)
Publication:
Publications of the Astronomical Society of Japan, Vol.59, No.SP3, pp.S631--S636 (OUP Homepage)
Publication Date:
11/2007
Origin:
PASJ
Astronomy Keywords:
Sun: chromosphere, Sun: oscillations, Sun: sunspots
DOI:
10.1093/pasj/59.sp3.S631
Bibliographic Code:
2007PASJ...59S.631N

Abstract

Exploiting high-resolution observations made by the Solar Optical Telescope on board Hinode, we investigate the spatial distribution of the power spectral density of the oscillatory signal in and around the active region NOAA 10935. The G-band data show that in the umbra the oscillatory power is suppressed in all frequency ranges. On the other hand, in CaII H intensity maps oscillations in the umbra, so-called umbral flashes, are clearly seen with the power peaking around 5.5mHz. The CaII 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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