Physics – Geophysics
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989rvgeo..27..495l&link_type=abstract
Reviews of Geophysics (ISSN 8755-1209), vol. 27, Nov. 1989, p. 495-518. Research supported by the U.S. Navy.
Physics
Geophysics
39
Auroral Electrojets, Plasma Frequencies, Plasma Waves, Space Plasmas, Wavelengths, Bow Waves, Cross Correlation, Plasma Turbulence, Solitary Waves
Scientific paper
A plasma wave can be described by its frequency and wave vector, while a nonlinear plasma structure such as a solitary wave can be described by its temporal signature and scale size. Time series or frequency measurements are relatively easy to perform from spacecraft, but wavelength or scale size measurements are difficult. Nevertheless, direct measurements of wavelength have contributed to understanding plasma waves and fluctuations; for example, such measurements have established the widespread existence of spatial irregularities in the magnetosphere, determined the characteristics of waves upstream of the earth's bow shock, and allowed the size and motion of double-layer-like structures along auroral field lines to be inferred. This paper reviews progress in making measurements of wavelength and scale sizes. The different techniques for inferring wavelength are described, and then a series of case studies is considered to demonstrate applications.
Kintner Paul M.
LaBelle James
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