Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ap%26ss..97..145s&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 97, no. 1, Nov. 1983, p. 145-150.
Astronomy and Astrophysics
Astronomy
Cosmic X Rays, Radiant Flux Density, Radio Sources (Astronomy), X Ray Sources, Bremsstrahlung, Energy Spectra, Solar Flares, X Ray Spectra
Scientific paper
The mechanism of X-ray and radio emission from cosmic objects is investigated analytically. Expressions are derived for the earth-observed density fluxes of X-rays (due to collisional bremsstrahlung) and radio waves (due to the gyrosynchrotron mechanism) emitted by the same energetic electrons in a plasma under a magnetic field. An equation relating the two fluxes is obtained by solving the X-ray expression for the electron-energy spectrum at the point of emission and substituting it in the radio-wave expression. This equation is shown to be independent of the distance from earth and to permit calculation of either flux if the other is known. Numerical calculations based on a conventional power-law X-ray spectrum with an index of 3.5 are included. It is pointed out that the radio-emission mechanism is valid only for optically thin frequency regions and that such phenomena as absorption effects, Razin suppression and electron-electron bremsstrahlung must be considered in many astrophysical applications.
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