Search Publications
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…
Probing the Disk-Jet Connection of the Radio Galaxy 3C 120 Observed with Suzaku
Isobe, Naoki; Takahashi, Tadayuki; Tashiro, Makoto S. +13 more
We report on deep (40ks × 4) observations of the bright broad line radio galaxy 3C 120 using Suzaku. The observations were spaced one week apart, and sampled a range of continuum fluxes. An excellent broadband spectrum was obtained over two decades of frequency (0.6 to 50keV) within each 40ks exposure. We clearly resolved the iron K emission-line …
Hinode Observations of a Vector Magnetic Field Change Associated with a Flare on 2006 December 13
Tsuneta, Saku; Shimizu, Toshifumi; Kubo, Masahito +10 more
Continuous observations of the flare productive active region 10930 were successfully carried out with the Solar Optical Telescope aboard the Hinode spacecraft during 2006 December 6 to 19. We focused on the evolution of photospheric magnetic fields in this active region, and the magnetic field properties at the site of the X3.4 class flare, using…
Discovery of a Temperature-Dependent Upflow in the Plage Region During a Gradual Phase of the X-Class Flare
Harra, Louise K.; Hara, Hirohisa; Kamio, Suguru +5 more
We present Hinode/EIS raster scan observations of the plage region taken during the gradual phase of the GOES X3.2 flare that occurred on 2006 December 13. The plage region is located 200" east of the flare arcade. The plage region has a small transient coronal hole. The transient coronal hole is strongly affected by an X-class flare, and upflows …
Hinode EUV Study of Jets in the Sun's South Polar Corona
Harra, Louise K.; Doschek, George A.; Lundquist, Loraine L. +8 more
A number of coronal bright points and associated plasma jet features were seen in an observation of the South polar coronal hole during 2007 January. The 40" wide slot was used at the focus of the Hinode EUV Imaging Spectrometer to provide spectral images for two of these events. Light curves are plotted for a number of emission lines that include…