Cavitating Langmuir Turbulence in the Terrestrial Aurora

Details Cavitating Langmuir Turbulence in the Terrestrial Aurora Cavitating Langmuir Turbulence in the Terrestrial Aurora

2011-01-18

arxiv.org/abs/1101.3517v3

Phys. Rev. Lett., 10 (2012), 108, 105003

Physics

Space Physics

4 pages, 4 figures, published in PRL on 9 March 2012 http://link.aps.org/doi/10.1103/PhysRevLett.108.105003

Scientific paper

10.1103/PhysRevLett.108.105003

Langmuir cavitons have been artificially produced in the earth's ionosphere, but evidence of naturally-occurring cavitation has been elusive. By measuring and modeling the spectra of electrostatic plasma modes, we show that natural cavitating, or strong, Langmuir turbulence does occur in the ionosphere, via a process in which a beam of auroral electrons drives Langmuir waves, which in turn produce cascading Langmuir and ion-acoustic excitations and cavitating Langmuir turbulence. The data presented here are the first direct evidence of cavitating Langmuir turbulence occurring naturally in any space or astrophysical plasma.

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