Thermal Cyclotron Absorption Coefficients. II. Opacities in the Stokes Formalism

Details Thermal Cyclotron Absorption Coefficients. II. Opacities in the Stokes Formalism Thermal Cyclotron Absorption Coefficients. II. Opacities in the Stokes Formalism

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apjs...98..295v&link_type=abstract

Astrophysical Journal Supplement v.98, p.295

Astronomy and Astrophysics

Astronomy

4

Atomic Processes, Plasmas, Radiation Mechanisms: Nonthermal, Stars: Neutron, Stars: White Dwarfs

Scientific paper

We extend the discussion of the calculation of the cyclotron opacities α± of the ordinary and extraordinary mode (Chanmugam et al.) to the opacities κ, q, υ in the Stokes formalism. We derive formulae with which a can be calculated from κ, q, υ. We are hence able to compare our calculations of the opacities, which are based on the single-particle method, with results obtained with the dielectric tensor method of Tam or. Excellent agreement is achieved. We present extensive tables of the opacities in the Stokes formalism for frequencies up to 25ωc, where ωc is the cyclotron frequency, and temperatures kT = 5, 10,20, 30,40, and 50 keV.
Furthermore, we derive approximate formulae with which κ, q, υ can be calculated from α± and hence use the Robinson & Melrose analytic formulae for α± in order to calculate the opacities in the Stokes formalism. We compare these opacities to accurate numerical opacities and find that the analytic formulae can reproduce the qualitative behavior of the opacities in the regions where the harmonic structure is unimportant.

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