Search Publications
A Tale of Two Spicules: The Impact of Spicules on the Magnetic Chromosphere
Carlsson, Mats; Tsuneta, Saku; Shimizu, Toshifumi +11 more
We use high-resolution observations of the Sun in CaIIH (3968Å) from the Solar Optical Telescope on Hinode to show that there are at least two types of spicules that dominate the structure of the magnetic solar chromosphere. Both types are tied to the relentless magnetoconvective driving in the photosphere, but have very different dynamic properti…
EUV Emission Lines and Diagnostics Observed with Hinode/EIS
Del Zanna, Giulio; Landi, Enrico; Harra, Louise K. +9 more
Quiet Sun and active region spectra from the Hinode/EIS instrument are presented, and the strongest lines from different temperature regions discussed. A list of emission lines recommended to be included in EIS observation studies is presented based on analysis of blending and diagnostic potential using the CHIANTI atomic database. In addition we …
A Study of Polar Jet Parameters Based on Hinode XRT Observations
Golub, Leon; Shimojo, Masumi; Narukage, Noriyuki +9 more
Hinode/SOHO campaign 7197 is the most extensive study of polar jet formation and evolution from within both the north and south polar coronal holes so far. For the first time, this study showed that the appearance of X-ray jets in the solar coronal holes occurs at very high frequency - about 60 jets d-1 on average. Using observations co…
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…
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…
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…
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…