Simulation study of EM radiation from Langmuir/z waves in warm magnetized plasmas

Details Simulation study of EM radiation from Langmuir/z waves in warm magnetized plasmas Simulation study of EM radiation from Langmuir/z waves in warm magnetized plasmas

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsh51b..05k&link_type=abstract

American Geophysical Union, Spring Meeting 2007, abstract #SH51B-05

Astronomy and Astrophysics

Astrophysics

2100 Interplanetary Physics, 2139 Interplanetary Shocks, 2159 Plasma Waves And Turbulence, 7500 Solar Physics, Astrophysics, And Astronomy, 7534 Radio Emissions

Scientific paper

Linear mode conversion (LMC) of Langmuir waves to radiation near the plasma frequency at density gradients is relevant to solar and interplanetary radio bursts, planetary foreshocks, and perhaps pulsar radio emissions. We study LMC in warm magnetized plasmas using numerical electron fluid simulations as functions of the angles between the density gradient, ambient magnetic field (B0), and wavevector. The dependences of the mode conversion efficiency on B0, spatial scales of density gradients, incidence angle θ of the Langmuir wave, relative to the density gradient, and the angle α between density gradient and B0 are presented. The mode conversion window narrows as B0 increases and the conversion efficiency increases as α increases. We show strong evidence that LMC produces extraordinary (x) mode as well as ordinary (o) mode radiation from Langmuir waves. Equal amounts of o- and x-mode radiation are produced in the unmagnetized limit at least when ¥á is small. Possible applications of LMC to the solar radio bursts in the solar wind and corona, and to planetary continuum radiation are also explored and it is suggested that LMC can explain linear and/or elliptical polarizations of type II and III solar radio bursts.

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