Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-04-05
Astrophys.J. 527 (1999) 992-999
Astronomy and Astrophysics
Astrophysics
30 pages, 3 figures, Submitted to ApJ, Microsoft Word File 6.0/95
Scientific paper
10.1086/308113
In the present work we undertake a study of the quasi-static loop model and the observational consequences of the various solutions found. We obtain the most general solutions consistent with certain initial conditions. Great care is exercised in choosing these conditions to be physically plausible (motivated by observations). We show that the assumptions of previous quasi-static loop models, such as the models of Rosner, Tucker and Vaiana (1978) and Veseckey, Antiochos and Underwood (1979), are not necessarily valid for small loops at transition region temperatures. We find three general classes of solutions for the quasi-static loop model, which we denote, radiation dominated loops, conduction dominated loops and classical loops. These solutions are then compared with observations. Departures from the classical scaling law of RTV are found for the solutions obtained. It is shown that loops of the type that we model here can make a significant contribution to lower transition region emission via thermal conduction from the upper transition region.
Jr.
Barbee Troy W.
Hoover Richard B.
II
Oluseyi Hakeem M.
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