Y
Yukio Katsukawa
Researcher at National Institutes of Natural Sciences, Japan
Publications - 102
Citations - 7907
Yukio Katsukawa is an academic researcher from National Institutes of Natural Sciences, Japan. The author has contributed to research in topics: Sunspot & Magnetic field. The author has an hindex of 37, co-authored 93 publications receiving 7450 citations. Previous affiliations of Yukio Katsukawa include Graduate University for Advanced Studies.
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Journal ArticleDOI
The Solar Optical Telescope for the Hinode Mission: An Overview
Saku Tsuneta,Kiyoshi Ichimoto,Yukio Katsukawa,Shin Nagata,Masashi Otsubo,Toshifumi Shimizu,Yoshinori Suematsu,Masao Nakagiri,M. Noguchi,T. D. Tarbell,A. M. Title,R. A. Shine,W. Rosenberg,C. Hoffmann,B. Jurcevich,Gary D. Kushner,M. Levay,Bruce W. Lites,D. F. Elmore,Tadashi Matsushita,Noboru Kawaguchi,H. Saito,Izumi Mikami,L. D. Hill,J. K. Owens +24 more
TL;DR: The solar optical telescope (SOT) as discussed by the authors is a 50-cm diffraction-limited Gregorian telescope with the Stokes Spectro-Polarimeter (SP) attached to it.
Journal ArticleDOI
Chromospheric alfvenic waves strong enough to power the solar wind.
B. De Pontieu,Scott W. McIntosh,Scott W. McIntosh,Mats Carlsson,Viggo Hansteen,T. D. Tarbell,Carolus J. Schrijver,A. M. Title,R. A. Shine,Saku Tsuneta,Yukio Katsukawa,Kiyoshi Ichimoto,Yoshinori Suematsu,Toshifumi Shimizu,Shin Nagata +14 more
TL;DR: Estimates of the energy flux carried by these waves and comparisons with advanced radiative magnetohydrodynamic simulations indicate that such Alfvén waves are energetic enough to accelerate the solar wind and possibly to heat the quiet corona.
Journal ArticleDOI
The Horizontal Magnetic Flux of the Quiet-Sun Internetwork as Observed with the Hinode Spectro-Polarimeter
Bruce W. Lites,M. Kubo,M. Kubo,Hector Socas-Navarro,Thomas E. Berger,Z. Frank,R. A. Shine,T. D. Tarbell,A. M. Title,Kiyoshi Ichimoto,Yukio Katsukawa,Saku Tsuneta,Yoshinori Suematsu,Toshifumi Shimizu,Shin Nagata +14 more
TL;DR: In this paper, the authors show that magnetic fields are organized on mesogranular scales, with both horizontal and vertical fields showing voids of reduced flux density of a few granules spatial extent.
Journal ArticleDOI
The Solar Optical Telescope of Solar-B (Hinode): The Optical Telescope Assembly
Yoshinori Suematsu,Saku Tsuneta,Kiyoshi Ichimoto,Toshifumi Shimizu,Masashi Otsubo,Yukio Katsukawa,Masao Nakagiri,M. Noguchi,T. Tamura,Yoshiaki Kato,Hirohisa Hara,Masahito Kubo,I. Mikami,H. Saito,T. Matsushita,N. Kawaguchi,T. Nakaoji,K. Nagae,Shigenobu Shimada,Norihide Takeyama,T. Yamamuro +20 more
TL;DR: The solar optical telescope (SOT) as mentioned in this paper was designed to perform high-precision photometric and polarimetric observations of the Sun in visible light spectra (388 − 668 nm) with a spatial resolution of 0.2 - 0.3 arcsec.
Journal ArticleDOI
Chromospheric Anemone Jets as Evidence of Ubiquitous Reconnection
Kazunari Shibata,Tahei Nakamura,Takuma Matsumoto,Kenichi Otsuji,Takenori J. Okamoto,N. Nishizuka,T. Kawate,Hiroko Watanabe,Shin’ichi Nagata,Satoru Ueno,Reizaburo Kitai,Satoshi Nozawa,Saku Tsuneta,Yoshinori Suematsu,Kiyoshi Ichimoto,Toshifumi Shimizu,Yukio Katsukawa,Theodore D. Tarbell,Thomas E. Berger,Bruce W. Lites,Richard A. Shine,Alan M. Title +21 more
TL;DR: Hinode observations of chromospheric anemone jets suggest that magnetic reconnection similar to that in the corona is occurring at a much smaller spatial scale throughout the chromosphere, and suggest that the heating of the solar chromosphere and corona may be related to small-scale ubiquitous reconnection.