scholarly journals Magnetic Structure of Umbral Dots Observed with the Hinode Solar Optical Telescope

2009 ◽  
Vol 61 (2) ◽  
pp. 193-200 ◽  
Author(s):  
Hiroko Watanabe ◽  
Reizaburo Kitai ◽  
Kiyoshi Ichimoto ◽  
Yukio Katsukawa
Keyword(s):  
Magnetic Structure ◽  
Optical Telescope ◽  
Solar Optical Telescope ◽  
Umbral Dots

scholarly journals Observations of photospheric magnetic structure below a dark filament using the Hinode Spectro-Polarimeter

2019 ◽  
Vol 71 (2) ◽  
Author(s):  
Takaaki Yokoyama ◽  
Yukio Katsukawa ◽  
Masumi Shimojo
Keyword(s):  
Magnetic Structure ◽  
Flux Rope ◽  
Transverse Field ◽  
Optical Telescope ◽  
Polarity Inversion ◽  
Normal Orientation ◽  
Normal Polarity ◽  
East Limb ◽  
Polarity Inversion Line ◽  
Dark Filament

Abstract The structure of the photospheric vector magnetic field below a dark filament on the Sun is studied using the observations of the Spectro-Polarimeter attached to the Solar Optical Telescope onboard Hinode. Special attention is paid to discriminating between two suggested models, a flux rope or a bent arcade. “Inverse polarity” orientation is possible below the filament in a flux rope, whereas “normal polarity” can appear in both models. We study a filament in the active region NOAA 10930, which appeared on the solar disk during 2006 December. The transverse field perpendicular to the line of sight has a direction almost parallel to the filament spine with a shear angle of 30°, the orientation of which includes the 180° ambiguity. To know whether it is in the normal orientation or in the inverse one, the center-to-limb variation is used for the solution under the assumption that the filament does not drastically change its magnetic structure during the passage. When the filament is near the east limb, we found that the line-of-site magnetic component below the filament is positive, while it is negative near the west limb.This change of sign indicates that the horizontal photospheric field perpendicular to the polarity inversion line beneath the filament has an “inverse-polarity”, which indicates a flux-rope structure of the filament supporting field.

scholarly journals Structure of sunspots observed with Hinode Solar Optical Telescope

2010 ◽  
Vol 6 (S273) ◽  
pp. 478-482
Author(s):  
Debi Prasad Choudhary ◽  
Gordon A. MacDonald ◽  
Na Deng ◽  
Shimizu Toshifumi
Keyword(s):  
Disk Center ◽  
Optical Telescope ◽  
Solar Optical Telescope ◽  
Side Asymmetry

AbstractWe studied 16 sunspots with different sizes and shapes using the observations with the Hinode Solar Optical Telescope. The ratio of G-band and CaII H images reveal rich structures both within the umbra and penumbra of most spots. The striking features are the compact blob at the foot point of the umbra side of the penumbral fibrils with disk center-limb side asymmetry. In this paper, we present properties of these features using the spectropolarimetry and images in G-band, CaII and blue filters. We discuss the results using the contemporary models of the sunspots.

Design of large aperture solar optical telescope for the SOLAR-C mission

2012 ◽  
Author(s):  
Y. Suematsu ◽  
Y. Katsukawa ◽  
H. Hara ◽  
T. Shimizu ◽  
K. Ichimoto
Keyword(s):  
Optical Telescope ◽  
Large Aperture ◽  
Solar Optical Telescope
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