Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...310..661f&link_type=abstract
Astronomy and Astrophysics, v.310, p.661-671
Astronomy and Astrophysics
Astrophysics
17
Sun: X-Rays, Corona, Flares
Scientific paper
In this paper we use numerical simulations to accurately model the evolution of non-thermal electron distributions in coronal loops, from which we calculate electron bremsstrahlung height versus energy distributions. The results are compared with results of the Yohkoh satellite and it is found that a model taking into account the full complexity of electron transport can explain what is observed, for quite reasonable loop parameters. We test three loop models, the first with no field convergence, the second with field convergence occurring rapidly and only in the chromosphere and the third where field convergence occurs slowly in the corona. We demonstrate the effects of varying parameters of the loop (such as density, length and field strength), and of the beam (spectral index, pitch angle distribution) and outline parameter regimes in which best agreement with the data can be found. Broadly, densities between 2x10^10^ and 3x10^11^cm^-3^ and coronal half-lengths L=~1.3-2.7x10^9^cm give qualitatively acceptable results. Finally we discuss possible tests to distinguish between the various models which can explain the height distribution.
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