Physics
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992soph..139...81h&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 139, no. 1, May 1992, p. 81-104. Research supported by Observatoire de Paris.
Physics
27
Coronal Loops, Plasma Dynamics, Solar Flares, Electron Density (Concentration), Gas Pressure, H Alpha Line, Stellar Models
Scientific paper
MSDP spectrograph observations of a flare are employed to identify a single cool loop to analyze the observed H alpha line profiles and semiempirically derive four key physical and dynamical parameters. The first-order differential cloud model is used to determine the H alpha source function, cloud velocity, Doppler width, and the differential optical thickness. Gas pressure, electron density, plasma density, and ionization degree are then evaluated by means of a non-LTE radiative transfer technique modified by using a five-level hydrogen-atom model with partially redistributed Lyman lines. The results of the models are used to discuss the momentum-balance conditions in cool flare loops quantitatively. The cool loops that appear in absorption are not affected significantly by pressure forces, and important departures from free-fall motion are noted under the action of gravity. The plasma deceleration is thought to result from either the temporal evolution, helical structure, or two-component nature of the magnetic structure.
Heinzel Petr
Mein Pierre
Schmieder Brigitte
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