Hinode EIS Observations of Solar Active Regions

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Scientific paper

The EUV Imaging Spectrometer (EIS) on the Hinode satellite provides high spatial and spectral resolution data along a 512 arcsec slit in two wavelength ranges, 170--210 Angstroms and 250--290 Angstroms. These wavelengths mostly contain emission lines from upper transition region and coronal plasmas. Emission from these wavelengths is routinely imaged using instruments such as the EIT on SOHO and TRACE, but there are few high-resolution spectra to aid in more deeply understanding the physical conditions and dynamics associated with the intensity variations seen in the images. In this presentation, we show some initial results from EIS active region studies aimed at mapping the density, temperature, nonthermal broadening, and Doppler shifts in active regions. This presentation focusses on spectroheliograms of active regions in diagnostically interesting spectral lines. These show the overall active region morphology and the behavior of Doppler shifts, nonthermal velocities, and densities as a function of position, but at the expense of high time resolution. Other presentations will focus on how the observed physical parameters vary with time.

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