Astronomy and Astrophysics – Astronomy
Scientific paper
May 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spd....34.1701a&link_type=abstract
American Astronomical Society, SPD meeting #34, #17.01; Bulletin of the American Astronomical Society, Vol. 35, p.837
Astronomy and Astrophysics
Astronomy
Scientific paper
Recent observations with TRACE reveal that the time delay between the appearance of a cooling loop in different EUV temperature filters is proportional to the loop length, dt12 ˜ L . We model this cooling delay in terms of radiative loss and confirm this linear relationship theoretically. We derive an expression that can be used to constrain the coronal iron enhancement AFe=AFecor/AFePh relative to the photospheric value as function of the cooling delay dt12, flux F2, loop width w, and filling factor qw < 1. With this relation we find upper limits on the iron abundance enhancement of AFe < 4.8 +/- 1.7 for 10 small-scale nanoflare loops, and AFe < 1.4 +/- 0.4 for 5 large-scale loops, in the temperature range of T ˜ 1.0-1.4 MK. This result supports the previous finding that low-FIP elements, including Fe, are enhanced in the corona. The same relation constitutes also a lower limit for the filling factor, which is qw > 0.2 +/- 0.1 and qw > 0.8 +/- 0.2 for the two groups of coronal loops.
Aschwanden Markus J.
Schrijver Carolus J.
Warren Harry P.
Winebarger Amy R.
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