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Type: Artigo de periódico
Title: Can microbunch instability on solar flare accelerated electron beams account for bright broadband coherent synchrotron microwaves?
Author: Kaufmann, P
Raulin, JP
Abstract: The physical processes producing bright broadband coherent synchrotron radiation (CSR) bursts in laboratory accelerators are proposed to happen also in solar flares, bringing a plausible explanation to serious interpretation constraints raised by the discovery of a solar flare sub-mm-wave spectral emission component peaking in the terahertz (THz) range simultaneous to the well-known microwaves component. The THz component is due to incoherent synchrotron radiation (ISR) produced by a beam of ultrarelativistic electrons. Beam density perturbations, on a scale of the order of or smaller than the emitting wavelength, sets a microbunch instability producing the intense CSR at lower frequencies. Hard x-ray/gamma-ray emissions may include a significant synchrotron emission component from the same ISR spectrum, bringing a new possibility to explain the so called 'solar flare electron number paradox.' (c) 2006 American Institute of Physics.
Country: EUA
Editor: Amer Inst Physics
Citation: Physics Of Plasmas. Amer Inst Physics, v. 13, n. 7, 2006.
Rights: aberto
Identifier DOI: 10.1063/1.2244526
Date Issue: 2006
Appears in Collections:Unicamp - Artigos e Outros Documentos

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