Cavitating Langmuir Turbulence in the Terrestrial Aurora

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

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa41a1847i&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA41A-1847

Astronomy and Astrophysics

Astrophysics

[2407] Ionosphere / Auroral Ionosphere, [2471] Ionosphere / Plasma Waves And Instabilities, [2483] Ionosphere / Wave/Particle Interactions, [2494] Ionosphere / Instruments And Techniques

Scientific paper

Langmuir cavitons have been artificially produced in the earth's ionosphere, but evidence of naturally occurring cavitation has been elusive. Naturally enhanced ion-acoustic waves have been detected in the ionosphere, but without confirmation of a mechanism for their creation. By measuring and modeling the spectra of electrostatic plasma modes, we show that natural cavitating, or strong, Langmuir turbulence occurs in the ionosphere and can create ion-acoustic enhancements 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. This is the first conclusive evidence of cavitating Langmuir turbulence occurring naturally in any astrophysical plasma.

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