Statistics – Computation
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.138..333c&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 138, no. 2, Nov. 1987, p. 333-339.
Statistics
Computation
Electron Impact, Lithium, Polarization Characteristics, Resonance Lines, Solar Flares, Solar Magnetic Field, Computational Astrophysics, Magnetic Field Configurations
Scientific paper
The Oppenheimer-Penney theory, as developed by Percival and Seaton (1958), is applied to calculate the polarization of resonance lines from Li-like ions. Two laws for the pitch-angle distribution of electrons around the magnetic field are accounted. The degrees of polarization are averaged over the energy of non-thermal electrons generated during the initial phase of solar flares. It is found that for the full space pitch-angle distribution, as adopted by Chandra and Joshi (1984), the degrees of polarization are nearly independent of the atomic number of ion. Whereas for the forward-cone distribution used by Haug (1981), they depend on the choice of the free parameter E0. The polarization of the resonance lines from Li-like ions is two times larger than that of the Lα radiations from H-like ions. Hence, under favourable conditions, it may be detected during solar flares.
Chandra Suresh
Joshi A. W.
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