Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...478..799c&link_type=abstract
Astrophysical Journal v.478, p.799
Astronomy and Astrophysics
Astronomy
96
Sun: Corona, Sun: Flares, Sun: X-Rays, Gamma Rays
Scientific paper
The nanoflare model of Cargill (1994a) is used to model active region loops observed by the Yohkoh Soft X-ray Telescope (SXT). Using observed information concerning the dimensions and energy-loss rate of each loop, a range of loop models with different temperatures, emission measures, and filling factors is generated. For hot loops (T > 4 x 106 K), it is shown that filling factors less than 0.1 can fit the data, although the uncertainties can be quite large. For cool loops (T ~ 2 x 106 K), the model cannot reproduce the observed temperature and emission measure for any value of the filling factor. Earlier work of Porter & Klimchuk suggested that some of these loops cannot be explained by a steady state heating model either. It is proposed that there may exist two distinct classes of loops and that coronal material is injected into the cooler loops by a mechanism that is not directly related to heating (e.g., not chromospheric evaporation).
Cargill Peter J.
Klimchuk James A.
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