Escape of fundamental electron-cyclotron maser emission from the sun and stars

Details Escape of fundamental electron-cyclotron maser emission from the sun and stars Escape of fundamental electron-cyclotron maser emission from the sun and stars

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...341l..99r&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 341, June 15, 1989, p. L99-L102.

Astronomy and Astrophysics

Astrophysics

33

Masers, Radio Emission, Solar Radiation, Stellar Radiation, Absorption Spectra, Coupled Modes, Electron Cyclotron Heating, Escape (Abandonment), Radiative Transfer

Scientific paper

It is shown that fundamental x-mode emission from flaring regions can undergo partial mode conversion at the second-harmonic absorption layer, with a fraction emerging in the o mode through a window near theta = 90 deg; fundamental o-mode radiation can emerge through this window directly. The optical depth for mode-converted x-mode radiation is up to 200 times less than the depth tau(x) for unconverted radiation; the o-mode depth is up to c-squared/V-squared (roughly 1000) times smaller than tau(x), where V is the thermal velocity of the plasma. This mechanism is linear and threshold-free, requires little scattering or refraction of the emitted radiation, and permits the strongest instability (fundamental x-mode) to dominate in producing the observed emission.

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