Diagnostics of High Temperature Active Region Plasma with EIS/Hinode

Details Diagnostics of High Temperature Active Region Plasma with EIS/Hinode Diagnostics of High Temperature Active Region Plasma with EIS/Hinode

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.1212w&link_type=abstract

American Astronomical Society, SPD meeting #40, #12.12; Bulletin of the American Astronomical Society, Vol. 41, p.829

Astronomy and Astrophysics

Astronomy

Scientific paper

Solar active region loops at different temperatures appear to have very different properties. Coronal loops with apex temperatures near 1 MK have high densities and lifetimes long relative to a characteristic cooling time. The properties of these loops are generally consistent with impulsive heating models. Higher temperature coronal emission, in contrast, is generally consistent with steady heating models. This conclusion is largely based on the analysis of broad-band observations from the SXT on Yohkoh, which had modest spatial resolution and temperature discrimination. Because of these diagnostic limitations the time scale for the heating in the core of an active region is still an open question. The high resolution EIS spectrometer on Hinode provides new spectroscopic diagnostics of high temperature plasma in active region cores through the observation of Ca XIV, XV, XVI, and XVII emission lines. An initial survey of active regions cores indicates that the emission measure at high temperatures ( 3 MK) is uncorrelated with the emission measure at lower temperatures ( 1 MK), suggesting that these loops are not fully cooling. These results will be discussed in the context of hydrodynamic models.

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