Electromagnetic wave emission during collision between a current sheet and a fast magnetosonic shock associated with coronal mass ejections

Details Electromagnetic wave emission during collision between a current sheet and a fast magnetosonic shock associated with coronal mass ejections Electromagnetic wave emission during collision between a current sheet and a fast magnetosonic shock associated with coronal mass ejections

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...455.1099h&link_type=abstract

Astronomy and Astrophysics, Volume 455, Issue 3, September I 2006, pp.1099-1103

Astronomy and Astrophysics

Astrophysics

1

Plasmas, Shock Waves, Radiation Mechanisms: Non-Thermal, Methods: Numerical, Sun: Coronal Mass Ejections (Cmes)

Scientific paper

Aims.We investigate how the emission of electromagnetic waves can be enhanced when a fast magnetosonic shock wave associated with a coronal mass ejection (CME) collides perpendicularly to a coronal streamer with a stable current sheet. Methods: .A two-dimensional relativistic and fully electromagnetic Particle-In-Cell (PIC) code is used. Results: .It is shown that the ions in front of the shock can be accelerated by the surfatron acceleration mechanism. This shock compresses the current sheet, resulting in a local electron temperature anisotropy. The electron Bernstein waves are generated by the local electron temperature anisotropy and they are converted into electromagnetic waves (X-mode) through the linear mode conversion due to density inhomogeneity. As a result, the electromagnetic waves are observed in both forward and backward regions of the shock. The simulation results may be applied to the enhancement of electromagnetic wave emissions when a shock wave associated with CMEs collides with a coronal streamer.

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