Electron Densities in Active Region Loops Observed with Hinode/EIS

Details Electron Densities in Active Region Loops Observed with Hinode/EIS Electron Densities in Active Region Loops Observed with Hinode/EIS

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsp41c..02w&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SP41C-02

Physics

7509 Corona, 7519 Flares

Scientific paper

Active region observations with the Transition Region and Coronal Explorer (TRACE) showed that loops near 1 MK appear to have high densities relative to the predictions of scaling laws based on steady heating. These loops also persist much longer than a radiative cooling time. This lead to the formation of models based on the impulsive heating of small scale filaments. With the launch of the EUV Imaging Spectrometer (EIS) on Hinode we now have a much more detailed view of coronal loops at these temperatures. We find that the temperatures, densities, and filling factors inferred from the new spectroscopic data are largely consistent with our interpretation of the earlier TRACE observations. The impulsive heating models also predict low densities relative to the steady heating models at high temperatures, and we will discuss the EIS evidence for hot, underdense loops in solar active regions.

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