Mode conversion of Langmuir to electromagnetic waves with parallel inhomogeneity in the solar wind

Details Mode conversion of Langmuir to electromagnetic waves with parallel inhomogeneity in the solar wind Mode conversion of Langmuir to electromagnetic waves with parallel inhomogeneity in the solar wind

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh13a0395k&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH13A-0395

Astronomy and Astrophysics

Astrophysics

2100 Interplanetary Physics, 2159 Plasma Waves And Turbulence, 7500 Solar Physics, Astrophysics, And Astronomy, 7534 Radio Emissions, 7847 Radiation Processes

Scientific paper

Linear mode conversion of Langmuir waves to radiation near the plasma frequency at density gradients is potentially relevant to type I, II, and III solar radio bursts and Earth's foreshock. Here we study mode conversion in warm magnetized plasmas using a numerical electron fluid simulation code with the density gradient parallel to the ambient magnetic field ( B_0) for incident Langmuir waves over a range of wavevectors. Our results include: (1) Less than 10% of the incident electrostatic wave energy can be transformed into electromagnetic waves. (2) Both \it o- and \it x-mode waves are produced for a significant range of magnetic field strengths and length scales of the density gradient. (3) In the unmagnetized limit, equal amounts of \it o- and \it x-mode radiation is produced. (4) the mode conversion window narrows as B0 increases. (5) As B0 becomes stronger, the electromagnetic waves change from linear to circular polarization. (6) The conversion efficiency to \it x-mode decreases as B0 increases while the \it o-mode conversion efficiency oscillates due to an interference phenomenon. These results extend previous theoretical works [e.g., Mj\o hus, 1990; Yin and Ashour-Abdalla, 1999] and imply that the role of linear mode conversion in generating type III bursts needs to be re-evaluated.

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