Hinode EUV Imaging Spectrometer Observations of Solar Active Region Dynamics

Abstract

The EUV Imaging Spectrometer (EIS) on the Hinode satellite is capable of measuring emission line center positions for Gaussian line profiles to a fraction of a spectral pixel, resulting in relative solar Doppler-shift measurements with an accuracy of less than a km/s for strong lines. We show an example of the application of that capability to an active region sit-and-stare observation in which the EIS slit is placed at one location on the Sun and many exposures are taken while the spacecraft tracking keeps the same solar location within the slit. For the active region examined (NOAA 10930), we find that significant intensity and Doppler-shift fluctuations as a function of time are present at a number of locations. These fluctuations appear to be similar to those observed in high-temperature emission lines with other space-borne spectroscopic instruments. With its increased sensitivity over earlier spectrometers and its ability to image many emission lines simultaneously, EIS should provide significant new constraints on Doppler-shift oscillations in the corona.

7 Pages, 7 figures

Cited by in corpus (14)

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• Flows at the Edge of an Active Region: Observation and Interpretation
• Observations of Transient Active Region Heating with Hinode
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• On the spectroscopic detection of periodic plasma flows in loops undergoing thermal non-equilibrium
• Direct Observations of Plasma Upflows and Condensation in a Catastrophically Cooling Solar Transition Region Loop
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• EIS/Hinode observations of Doppler flow seen through the 40 arcsec wide slit
• Optical optimization of a multi-slit extreme ultraviolet spectrograph for global solar corona diagnostics