Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-07-10
Astrophys.J.629:L65-L68,2005
Astronomy and Astrophysics
Astrophysics
13 pages, 4 figures, ApJL accepted
Scientific paper
10.1086/444375
Microturbulence, i.e. enhanced fluctuations of plasma density, electric and magnetic fields, is of great interest in astrophysical plasmas, but occurs on spatial scales far too small to resolve by remote sensing, e.g., at ~ 1-100 cm in the solar corona. This paper reports spatially resolved observations that offer strong support for the presence in solar flares of a suspected radio emission mechanism, resonant transition radiation, which is tightly coupled to the level of microturbulence and provides direct diagnostics of the existence and level of fluctuations on decimeter spatial scales. Although the level of the microturbulence derived from the radio data is not particularly high, <\Delta n^2 >/n^2 ~ 10^{-5}$, it is large enough to affect the charged particle diffusion and give rise to effective stochastic acceleration. This finding has exceptionally broad astrophysical implications since modern sophisticated numerical models predict generation of much stronger turbulence in relativistic objects, e.g., in gamma-ray burst sources.
Fleishman Gregory D.
Gary Dale E.
Nita Gelu M.
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