Interpretation of EUV spectra from loop structures in an active region at the limb

Details Interpretation of EUV spectra from loop structures in an active region at the limb Interpretation of EUV spectra from loop structures in an active region at the limb

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...150...69d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 150, no. 1, Sept. 1985, p. 69-75. SERC-supported research.

Astronomy and Astrophysics

Astronomy

34

Coronal Loops, Extreme Ultraviolet Radiation, Solar Limb, Solar Spectra, Stellar Flares, Ultraviolet Astronomy, Data Reduction, Electron Density (Concentration), Emission Spectra, Heliometers, Solar Activity, Spectral Energy Distribution, Spectrum Analysis, Stellar Models

Scientific paper

EUV spectral scans and rasters of an active region observed at the limb are analyzed. These were obtained with the Harvard EUV spectroheliometer on the Apollo Telescope Mount. The spectra were taken following a small flare and an H-alpha surge. Diagnostic line ratios are used to determine electron densities and temperatures from the spectral scans. An electron pressure of 10 to the 15th/cu cm K is derived at 200,000 K. The temperatures derived from the diagnostic ratios indicate that the plasma is in ionization equilibrium, although mass flows of a few kilometers per s could be present. Rasters of the active region taken later show well defined loop structures. The parameters derived from the low temperature lines (100,000 K) and the rasters are inconsistent with those inferred from scaling laws based on static loop models. However, better agreement between the derived parameters and the models is achieved if use is made of the electron density derived from the emission measure of Mg X, and it is assumed that it remains constant up to 5-million K.

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