Search Publications
The Suzaku High Resolution X-Ray Spectrometer
Ishida, Manabu; Kelley, Richard L.; Kilbourne, Caroline A. +41 more
The X-Ray Spectrometer (XRS) has been designed to provide the Suzaku Observatory with non-dispersive, high-resolution X-ray spectroscopy. As designed, the instrument covers the energy range 0.3 to 12keV, which encompasses the most diagnostically rich part of the X-ray band. The sensor consists of a 32-channel array of X-ray microcalorimeters, each…
Fine-Scale Structures of the Evershed Effect Observed by the Solar Optical Telescope aboard Hinode
Shimojo, Masumi; Tsuneta, Saku; Shimizu, Toshifumi +10 more
The small-scale structure of the Evershed effect is being studied using data obtained by the Spectropolarimeter and the Broadband Filter Imager of the Solar Optical Telescope aboard Hinode. We find that the Evershed flow starts at the leading edge of inwardly migrating bright penumbral grains, and turns to nearly a horizontal flow preferentially i…
Suzaku Observations of the Local and Distant Hot ISM
Hamaguchi, Kenji; Ishida, Manabu; Kilbourne, Caroline A. +18 more
Suzaku observed the molecular cloud MBM 12 and a blank field less than 3° away to separate the local and distant components of the diffuse soft X-ray background. Towards MBM 12, a local (D ≲ 275 pc) O VII emission line was clearly detected with an intensity of 3.5 photons cm-2 s-1 sr-1 (or line units, LU), and the …
Flare Ribbons Observed with G-band and Fe I 6302Å, Filters of the Solar Optical Telescope on Board Hinode
Tsuneta, Saku; Shimizu, Toshifumi; Kubo, Masahito +11 more
The Solar Optical Telescope (SOT) on board the Hinode satellite observed an X3.4 class flare on 2006 December 13. A typical two-ribbon structure was observed, not only in the chromospheric CaII H line, but also in the G-band and FeI 6302Å line. The high-resolution, seeing-free images achieved by SOT revealed, for the first time, sub-arcsec fine st…
Can High Frequency Acoustic Waves Heat the Quiet Sun Chromosphere?
Carlsson, Mats; Tsuneta, Saku; Shimizu, Toshifumi +9 more
We use Hinode/SOT Ca II H-line and blue continuum broadband observations to study the presence and power of high frequency acoustic waves at high spatial resolution. We find that there is no dominant power at small spatial scales; the integrated power using the full resolution of Hinode (0.05'' pixels, 0.16'' resolution) is larger than the power i…
Observations of Sunspot Oscillations in G Band and CaII H Line with Solar Optical Telescope on Hinode
Tsuneta, Saku; Shimizu, Toshifumi; Kosovichev, Alexander G. +11 more
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 han…
Revealing the High Energy Emission from the Obscured Seyfert Galaxy MCG-5-23-16 with Suzaku
Kunieda, Hideyo; Okajima, Takashi; Yaqoob, Tahir +19 more
We report on a 100ks Suzaku observation of the bright, nearby (z=0.008486) Seyfert 1.9 galaxy MCG-5-23-16. The broad-band (0.4-100keV) X-ray spectrum allows us to determine the nature of the high energy emission with little ambiguity. The X-ray continuum consists of a cutoff power-law of photon index Γ=1.9, absorbed through Compton-thin matter of …
Strategy for the Inversion of Hinode Spectropolarimetric Measurements in the Quiet Sun
Tsuneta, Saku; Shimizu, Toshifumi; Ichimoto, Kiyoshi +10 more
In this paper we propose an inversion strategy for the analysis of spectropolarimetric measurements taken by Hinode in the quiet Sun. The Spectro-Polarimeter of the Solar Optical Telescope aboard Hinode records the Stokes spectra of the FeI line pair at 630.2nm with unprecendented angular resolution, high spectral resolution, and high sensitivity.…
Coronal Dimming Observed with Hinode: Outflows Related to a Coronal Mass Ejection
Harra, Louise K.; Hara, Hirohisa; Young, Peter R. +5 more
Coronal dimming has been a signature used to determine the source of plasma that forms part of a coronal mass ejection (CME) for many years. Generally dimming is detected through imaging instruments such as SOHO EIT by taking difference images. Hinode tracked active region 10930 from which there were a series of flares. We combined dimming observa…
Suzaku Discovery of Iron Absorption Lines in Outburst Spectra of the X-Ray Transient 4U 1630-472
Done, Chris; Dotani, Tadayasu; Fabian, Andrew C. +12 more
We present the results of six Suzaku observations of the recurrent black hole transient 4U 1630-472 during its decline from outburst from February 8 to March 23 in 2006. All observations show the typical high/soft state spectral shape in the 2-50keV band, roughly described by an optically thick-disk spectrum in the soft energy band plus a weak pow…