|Título||Plasma emission by counter-streaming electron beams
Ziebell, Luiz Fernando
Petruzzellis, Larissa Teixeira
Yoon, Peter H.
|Abstract||The radiation emission mechanism responsible for both type-II and type-III solar radio bursts is commonly accepted as plasma emission. Recently Ganse et al. suggested that type-II radio bursts may be enhanced when the electron foreshock geometry of a coronal mass ejection contains a double hump structure. They reasoned that the counter-streaming electron beams that exist between the double shocks may enhance the nonlinear coalescence interaction, thereby giving rise to more efficient generation of radiation. Ganse et al. employed a particle-in-cell simulation to study such a scenario. The present paper revisits the same problem with EM weak turbulence theory, and show that the fundamental (F) emission is not greatly affected by the presence of counter-streaming beams, but the harmonic (H) emission becomes somewhat more effective when the two beams are present. The present finding is thus complementary to the work by Ganse et al.
|Contido em||The astrophysical journal. Bristol. Vol. 818, no. 1 (Feb. 2016), 61, 11 p.
Turbulência em plasmas
[en] Radiation mechanisms: non-thermal
[en] Solar wind
[en] Sun: radio radiation
|Tipo||Artigo de periódico
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