ISSN:
1573-093X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Taking into account the effect of roughness (or local departures from sphericity) of the emitting layers in the chromosphere-corona transition zone (CCT) allows one to determine the optical depths of layers responsible for resolved structures in Cii, Ciii, Oiv, and Ovi lines. The result, at the ‘top’ of the irregularities, is of the order of respectively τ1 ≥ 3.5,2.0, 1.6,0.5, and for the ‘bottom’ of these irregularities, τ2 = 0.7, 0.4, 0.3, 0.25. The characteristic angle of these irregularities is, respectively, of the order of 35 °, 33 °, 35 °, and 41 °. For unresolved structures of Civ and Ovi (already analyzed in the spherical symmetry hypothesis in Paper III), one finds τ1 ≈ 0.6; 0.9 and τ2 ≈ 0.12; 0.2 in the case of quiet areas; in the case of active areas, the range is broader for Civ and Ovi, from 1.0 to 1.7 for τ1 and from 0.2 to 0.9 for τ2. The values obtained from Ovi are in reasonable agreement with each other for resolved and unresolved structures. And the obtained values of τ1 and τ2 correspond not too badly with the determinations made in Paper III, by methods not exceedingly influenced by the spherical symmetry hypothesis.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00151912
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