Observations of sunspot oscillations in G band and Ca II H line with solar optical telescope on Hinode

Kaori Nagashima; Takashi Sekii; Alexander G. Kosovichev; Hiromoto Shibahashi; Saku Tsuneta; Kiyoshi Ichimoto; Yukio Katsukawa; Bruce Lites; Shin'ichi Nagata; Toshifumi Shimizu; Richard A. Shine; Yoshinori Suematsu; Theodore D. Tarbell; Alan M. Title

doi:10.1093/pasj/59.sp3.s631

Observations of sunspot oscillations in G band and Ca II H line with solar optical telescope on Hinode

Kaori Nagashima, Takashi Sekii, Alexander G. Kosovichev, Hiromoto Shibahashi, Saku Tsuneta, Kiyoshi Ichimoto, Yukio Katsukawa, Bruce Lites, Shin'ichi Nagata, Toshifumi Shimizu, Richard A. Shine, Yoshinori Suematsu, Theodore D. Tarbell, Alan M. Title

Research output: Contribution to journal › Article › peer-review

72 Scopus citations

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 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.

Original language	English (US)
Pages (from-to)	S631-S636
Journal	Publications of the Astronomical Society of Japan
Volume	59
Issue number	SPEC. ISS. 3
DOIs	https://doi.org/10.1093/pasj/59.sp3.s631
State	Published - 2007
Externally published	Yes

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

Sun: chromosphere
Sun: oscillations
Sun: sunspots

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10.1093/pasj/59.sp3.s631

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Nagashima, K., Sekii, T., Kosovichev, A. G., Shibahashi, H., Tsuneta, S., Ichimoto, K., Katsukawa, Y., Lites, B., Nagata, S., Shimizu, T., Shine, R. A., Suematsu, Y., Tarbell, T. D., & Title, A. M. (2007). Observations of sunspot oscillations in G band and Ca II H line with solar optical telescope on Hinode. Publications of the Astronomical Society of Japan, 59(SPEC. ISS. 3), S631-S636. https://doi.org/10.1093/pasj/59.sp3.s631

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title = "Observations of sunspot oscillations in G band and Ca II H line with solar optical telescope on Hinode",

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 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.",

keywords = "Sun: chromosphere, Sun: oscillations, Sun: sunspots",

author = "Kaori Nagashima and Takashi Sekii and Kosovichev, {Alexander G.} and Hiromoto Shibahashi and Saku Tsuneta and Kiyoshi Ichimoto and Yukio Katsukawa and Bruce Lites and Shin'ichi Nagata and Toshifumi Shimizu and Shine, {Richard A.} and Yoshinori Suematsu and Tarbell, {Theodore D.} and Title, {Alan M.}",

year = "2007",

doi = "10.1093/pasj/59.sp3.s631",

language = "English (US)",

volume = "59",

pages = "S631--S636",

journal = "Publications of the Astronomical Society of Japan",

issn = "0004-6264",

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Nagashima, K, Sekii, T, Kosovichev, AG, Shibahashi, H, Tsuneta, S, Ichimoto, K, Katsukawa, Y, Lites, B, Nagata, S, Shimizu, T, Shine, RA, Suematsu, Y, Tarbell, TD & Title, AM 2007, 'Observations of sunspot oscillations in G band and Ca II H line with solar optical telescope on Hinode', Publications of the Astronomical Society of Japan, vol. 59, no. SPEC. ISS. 3, pp. S631-S636. https://doi.org/10.1093/pasj/59.sp3.s631

TY - JOUR

T1 - Observations of sunspot oscillations in G band and Ca II H line with solar optical telescope on Hinode

AU - Nagashima, Kaori

AU - Sekii, Takashi

AU - Kosovichev, Alexander G.

AU - Shibahashi, Hiromoto

AU - Tsuneta, Saku

AU - Ichimoto, Kiyoshi

AU - Katsukawa, Yukio

AU - Lites, Bruce

AU - Nagata, Shin'ichi

AU - Shimizu, Toshifumi

AU - Shine, Richard A.

AU - Suematsu, Yoshinori

AU - Tarbell, Theodore D.

AU - Title, Alan M.

PY - 2007

Y1 - 2007

N2 - 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 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.

AB - 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 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.

KW - Sun: chromosphere

KW - Sun: oscillations

KW - Sun: sunspots

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U2 - 10.1093/pasj/59.sp3.s631

DO - 10.1093/pasj/59.sp3.s631

M3 - Article

AN - SCOPUS:39149101505

SN - 0004-6264

VL - 59

SP - S631-S636

JO - Publications of the Astronomical Society of Japan

JF - Publications of the Astronomical Society of Japan

IS - SPEC. ISS. 3

ER -

Observations of sunspot oscillations in G band and Ca II H line with solar optical telescope on Hinode

Abstract

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Keywords

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