Electron density and temperature structure of two limb active regions observed by SOHO-CDS |
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| Authors: | Mason HE Landi E Pike CD Young PR |
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| Institution: | (1) Department of Applied Mathematics and Theoretical Physics, Silver Street, UK;(2) Dipartimento di Astronomia e Scienza dello Spazio, Largo E. Fermi 5, 50125 Florence, Italy;(3) Space Science Dept., Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire, OX11 0QX, , U.K |
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| Abstract: | 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 (3×106 K) with larger cooler (106 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 2.3×109 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 2.5×106 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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