The Hinode (Solar-B) Mission: An Overview

Kosugi, T.; Matsuzaki, Keiichi; Sakao, Taro; Shimizu, Toshifumi; Sone, Yoshitsugu; Tachikawa, Sumitaka; Hashimoto, Tatsuaki; Minesugi, Kenji; Ohnishi, Akira; Yamada, Takahiro; Tsuneta, S.; Hara, Hirohisa; Ichimoto, Kiyoshi; Suematsu, Y.; Shimojo, Masataka; Watanabe, Tetsuya; Shimada, S.; Davis, John M.; Hill, L. D.; Owens, J. K.; Title, A. M.; Culhane, J. L.; Harra, L. K.; Doschek, G. A.; Golub, L.

doi:10.1007/s11207-007-9014-6

Cited by 1,615 publications

(994 citation statements)

References 12 publications

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“…Recent high-resolution observations of solar oscillation simultaneously in two intensity filters, in molecular G-band and CaII H line, from the Hinode space mission [76,77] revealed significant shifts in frequencies of pseudo-modes observed in the CaII H and G-band intensity oscillations [71]. The phase of the cross-spectrum of these oscillations shows peaks associated with the p-mode lines but no phase shift for the f-mode (Fig.…”

Section: Line Asymmetry and Pseudo-modesmentioning

confidence: 97%

Advances in Global and Local Helioseismology: An Introductory Review

Kosovichev

2011

The Pulsations of the Sun and the Stars

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Abstract. Helioseismology studies the structure and dynamics of the Sun's interior by observing oscillations on the surface. These studies provide information about the physical processes that control the evolution and magnetic activity of the Sun. In recent years, helioseismology has made substantial progress towards the understanding of the physics of solar oscillations and the physical processes inside the Sun, thanks to observational, theoretical and modeling efforts. In addition to the global seismology of the Sun based on measurements of global oscillation modes, a new field of local helioseismology, which studies oscillation travel times and local frequency shifts, has been developed. It is capable of providing 3D images of the subsurface structures and flows. The basic principles, recent advances and perspectives of global and local helioseismology are reviewed in this article.

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Section: Line Asymmetry and Pseudo-modesmentioning

confidence: 97%

Advances in Global and Local Helioseismology: An Introductory Review

Kosovichev

2011

The Pulsations of the Sun and the Stars

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“…For this study we use datasets obtained with the spectropolarimeter (Lites et al 2001) of the Hinode Solar Optical Telescope (SOT/SP, Tsuneta et al 2008;Kosugi et al 2007). The data are scanned slit-spectra of the Fe I lines at 6301.5 and 6302.5 Å, with a typical signal-to-noise level of 1000 and a spatial sampling of 0.16 .…”

Section: Observationsmentioning

confidence: 99%

Peripheral downflows in sunspot penumbrae

Noort

Lagg

Tiwari

et al. 2013

A&A

128

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Context. Sunspot penumbrae show high-velocity patches along the periphery. Aims. The high-velocity downflow patches are believed to be the return channels of the Evershed flow. We aim to investigate their structure in detail using Hinode SOT/SP observations. Methods. We employ Fourier interpolation in combination with spatially coupled height dependent LTE inversions of Stokes profiles to produce high-resolution, height-dependent maps of atmospheric parameters of these downflows and investigate their properties. Results. High-speed downflows are observed over a wide range of viewing angles. They have supersonic line-of-sight velocities, some in excess of 20 km s −1 , and very high magnetic field strengths, reaching values of over 7 kG. A relation between the downflow velocities and the magnetic field strength is found, in good agreement with MHD simulations. Conclusions. The coupled inversion at high resolution allows for the accurate determination of small-scale structures. The recovered atmospheric structure indicates that regions with very high downflow velocities contain some of the strongest magnetic fields that have ever been measured on the Sun.

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“…The Ca ii H images do not purely represent the chromosphere, but contain contributions from both the upper photosphere and lower chromosphere. These observations were carried out by the Broad-band Filter Imager (BFI) of the Solar Optical Telescope (SOT, Tsuneta et al 2008) on board Hinode (Kosugi et al 2007). Data sequences were captured every day from 09:00 UT to 12:00 UT with an average time cadence of 120 s (with some jumps in the data sequences).…”

Section: Hinode G-band and Ca II H Imagesmentioning

confidence: 99%

Horizontal flow fields observed in Hinode G-band images

Verma

Balthasar

Deng

et al. 2012

A&A

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Context. Generation and dissipation of magnetic fields is a fundamental physical process on the Sun. In comparison to flux emergence and the initial stages of sunspot formation, the demise of sunspots still lacks a comprehensive description. Aims. The evolution of sunspots is most commonly discussed in terms of their intensity and magnetic field. Here, we present additional information about the three-dimensional flow field in the vicinity of sunspots towards the end of their existence. Methods. We present a subset of multi-wavelengths observations obtained with the Japanese Hinode mission, the Solar Dynamics Observatory (SDO), and the Vacuum Tower Telescope (VTT) at Observatorio del Teide, Tenerife, Spain during the time period 2010 November 18−23. Horizontal proper motions were derived from G-band and Ca ii H images, whereas line-of-sight velocities were extracted from VTT echelle Hα λ656.28 nm spectra and Fe i λ630.25 nm spectral data of the Hinode/Spectro-Polarimeter, which also provided three-dimensional magnetic field information. The Helioseismic and Magnetic Imager on board SDO provided continuum images and line-of-sight magnetograms, in addition to the high-resolution observations for the entire disk passage of the active region. Results. We perform a quantitative study of photospheric and chromospheric flow fields in and around decaying sunspots. In one of the trailing sunspots of active region NOAA 11126, we observe moat flow and moving magnetic features (MMFs), even after its penumbra had decayed. We also detect a superpenumbral structure around this pore. We find that MMFs follow well-defined, radial paths from the spot all the way to the border of a supergranular cell surrounding the spot. In contrast, flux emergence near the other sunspot prevents the establishment of similar well ordered flow patterns, which could be discerned around a tiny pore of merely 2 Mm diameter. After the disappearance of the sunspots/pores, a coherent patch of abnormal granulation remained at their location, which was characterized by more uniform horizontal proper motions, low divergence values, and smaller photospheric Doppler velocities. This region, thus, differs significantly from granulation and other areas covered by G-band bright points. We conclude that this peculiar flow pattern is a signature of sunspot decay and the dispersal of magnetic flux.

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The Hinode (Solar-B) Mission: An Overview

Abstract: Abstract:The Hinode satellite (formerly Solar-

Cited by 1,615 publications

References 12 publications

Advances in Global and Local Helioseismology: An Introductory Review

Advances in Global and Local Helioseismology: An Introductory Review

Peripheral downflows in sunspot penumbrae

Horizontal flow fields observed in Hinode G-band images

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