Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jkas...29..207m&link_type=abstract
Journal of the Korean Astronomical Society, vol. 29, no. 2, p. 207-215
Astronomy and Astrophysics
Astronomy
Solar Corona, Euv Spectra, Non-Thermal
Scientific paper
To derive coronal temperature, electron density and nonthermal velocity, we have analyzed high resolution spectra (e.g., Fe XII 338.3, Fe XII 352.1, Fe XIV 334.2, Fe XIV 353.8, Fe XV 284.2, Fe XV 321.8, Fe XV 327.0, Fe XVI 335.4, and Fe XVI 360.8) taken from AR 6615 by SERTS (Solar Extreme Ultraviolet Rocket Telescope and Spectrograph). Important findings emerging from the present study are as follows: (1) Temperature estimated from Fe XVI 335.4 and Fe XIV 334.2 is about 2.4 times 10E6 K and no systematic difference in temperature is found between the active region and its adjacent quiet region; (2) Mean electron density estimated from Fe XV is about 3*10E9/cm3 and about 10E10/cm3 from Fe XII and Fe XIV; (3) Mean density of the active region is found to be higher than that of the quiet region by a factor of 2; (4) Nonthermal velocity estimated from Fe XV and Fe XVI is 20-25 km/s which decreases with increasing ionization temperatures. This supports the notion that the nonthermal velocity declines outwards above the transition region.
Davila Jose Manuel
Deuk Park Young
Moon Yong Jae
Yun Hong Sik
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