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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?|
|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.|
|Editor:||Amer Inst Physics|
|Appears in Collections:||Artigos e Materiais de Revistas Científicas - Unicamp|
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