Temperature and Density Structure of Hot and Cool Loops Derived from the Analysis of TRACE Data

Details Temperature and Density Structure of Hot and Cool Loops Derived from the Analysis of TRACE Data Temperature and Density Structure of Hot and Cool Loops Derived from the Analysis of TRACE Data

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...580.1159t&link_type=abstract

The Astrophysical Journal, Volume 580, Issue 2, pp. 1159-1171.

Astronomy and Astrophysics

Astronomy

43

Sun: Corona, Sun: Uv Radiation

Scientific paper

We study the transversal structure (in particular the filamentation) and the longitudinal plasma stratification in two sets of solar coronal loops observed with TRACE in the 171 and 195 Å passbands. The density stratification and the thermal structuring of the plasma along the fibrils that form the loops are derived using two techniques simultaneously: (1) a filter ratio diagnostic (195/171 Å) and (2) modeling intensity profiles along the fibrils with hydrostatic models; in both techniques we remove the background flux. We find consistent values of temperature and density with both methods in the coronal structures selected. We find evidence of a very warm fibril (T~5×106 K) and of rather cold ones (T~2×105 K). The hot fibril appears to have a thermal structure with a maximum at the apex compatible with temperature and density stratification, dictated by energy balance, typical of a nonisothermal hydrostatic loop. The cold fibrils appear to be isothermal and are probably in dynamical conditions.

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