Electron density and temperature structure of two limb active regions observed by SOHO-CDS

Details Electron density and temperature structure of two limb active regions observed by SOHO-CDS Electron density and temperature structure of two limb active regions observed by SOHO-CDS

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999soph..189..129m&link_type=abstract

Solar Physics, v. 189, Issue 1, p. 129-146 (1999).

Physics

22

Scientific paper

The analysis of two active regions on the limb using observations from SOHO-CDS allows us to determine the electron density and temperature distribution of the coronal emission. We find that the active regions have hot cores (3x10^6 K) with larger cooler (10^6 K) loop structures extending above the limb. The electron number density, determined using the Si X diagnostic line ratio, is found to be highest in the active region core (greater than 2.3x10^9 cm^-3). Electron number density values are determined for a range of spectral lines from different ions and are found to increase with temperature between 0.8 and 2.5x10^6 K. These results are consistent with recent models of enhanced heating along the compact core of active regions, where the magnetic field shear is strongest.

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