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Evidence from the Extreme-Ultraviolet Imaging Spectrometer for Axial Filament Rotation before a Large Flare

Harra, Louise K.; Brooks, David H.; Hansteen, Viggo H. +2 more

In this article, we present observations made with the Extreme-ultraviolet Imaging Spectrometer on-board the Hinode solar satellite, of an active region filament in the HeII emission line at 256.32Å. The host active region AR 10930 produces an X-class flare during these observations. We measure Doppler shifts with apparent velocities of up to 20km…

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

Ichimoto, Kiyoshi; Katsukawa, Yukio; Kitai, Reizaburo +1 more

A high-resolution, seeing-free spectroscopic observation of a decaying sunspot was made with the Solar Optical Telescope aboard the Hinode satellite. The target was NOAA 10944, located in the west side of the solar surface from 2007 March 2 to March 4. The umbra included many umbral dots (UDs) with a size of ∼300 km in continuum light. We report o…