Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...470.1117s&link_type=abstract
Astronomy and Astrophysics, Volume 470, Issue 3, August II 2007, pp.1117-1122
Astronomy and Astrophysics
Astrophysics
5
Plasmas, Shock Waves, Sun: Flares, Sun: Radio Radiation, Acceleration Of Particles
Scientific paper
Aims:We investigate the dynamics of proton beams propagating along a uniform magnetic field, as well as across the magnetic field in nonuniform solar plasmas, paying attention to the emission process of electromagnetic waves. The aim is to understand a new solar-burst component emitting only in the terahertz range during the solar flare observed by Kaufmann et al. (2004, ApJ, 603, L121). Methods: We used a 2D3V, fully relativistic, electromagnetic particle-in-cell (PIC) simulation. Results: From the simulation where the proton beams propagate along a uniform magnetic field into the high-density region, we found that strong electromagnetic waves are generated behind the proton beams. When the proton beams propagate perpendicular to the magnetic field, we found that the extra-ordinary mode can be excited from two electron Bernstein waves through three-wave interactions. These simulation results could be applied to the electromagnetic wave emission from the solar photosphere during the solar flares.
Nagasugi Y.
Sakai Jun-Ichi
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