Premium
Upper hybrid turbulence as a source of nonthermal continuum radiation
Author(s) -
Christiansen P. J.,
Etcheto J.,
Rönnmark K.,
Stenflo L.
Publication year - 1984
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl011i002p00139
Subject(s) - physics , radiation , turbulence , electromagnetic spectrum , electromagnetic radiation , dispersion relation , nonlinear system , computational physics , point source , geophysics , quantum electrodynamics , optics , meteorology , quantum mechanics
Recent observations of very narrow band features in the terrestrial electromagnetic “continuum” spectrum indicate that at least part of the radiation is generated in comparatively small source regions, and that weak turbulence theory can account only for the average power. We point out that the structure of the dispersion relation of electrostatic waves near the upper hybrid frequency allows localized nonlinear collapse processes, which could be responsible for the observed narrow band radiation.