Can microbunch instability on solar flare accelerated electron beams account for bright broadband coherent synchrotron microwaves?

Journal Article · Sat Jul 15 04:00:00 EDT 2006 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.2244526· OSTI ID:20860106

Kaufmann, Pierre; Raulin, Jean-Pierre ^[1]

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1. Centro de Radio-Astronomia e Astrofisica-CRAAM-Escola de Engenharia, Universidade Presbiteriana Mackenzie, Sao Paulo, SP (Brazil)

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'.

• OSTI ID: 20860106
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 7 Vol. 13; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BEAM-PLASMA SYSTEMS
DISTURBANCES
ELECTRON BEAMS
ELECTRONS
GAMMA RADIATION
HARD X RADIATION
MICROWAVE RADIATION
PHOTON EMISSION
PLASMA
PLASMA INSTABILITY
RELATIVISTIC RANGE
SOLAR FLARES
SOLAR RADIATION
SYNCHROTRON RADIATION
WAVELENGTHS
X-RAY SOURCES