Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...353..666t&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 353, April 20, 1990, p. 666-677.
Astronomy and Astrophysics
Astrophysics
31
Electric Fields, Relativistic Electron Beams, Solar Electrons, Solar Flares, Solar Radio Emission, Direct Current, Electrostatic Waves, Plasma Waves
Scientific paper
Direct radiation by runaway electrons under a constant (dc) electric field is investigated. In a one-and-two-halves-dimensional relativistic EM code, an electron beam propagates along the external magnetic field parallel to the dc field and quickly decays into a runaway tail sustained by the dc field. Electrostatic and transverse waves are observed at various (fixed for each particular run) angles of wave propagation. Both plasma waves and EM radiation are strongly enhanced by the runaway tail. In the linear and early nonlinear beam stages, the EM wave energy is slightly enhanced as the associated electrostatic component of the waves (together with the dc field) traps and detraps electrons. In the late nonlinear (runaway) stage and with sufficiently large observing angle, bursts of EM wave energy occur, accompanied by fast perpendicular spreading of the distribution function, and they coincide with clamping of runaway electron momenta. A possible application is to msec radio spikes associated with solar flares. In this situation, the possibility of the present mechanism yielding radiation temperatures in excess of 10 to the 15th K is not out of the question.
Benz Arnold O.
Leboeuf Jean-Noel
Tajima Toshiki
Thaker M.
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