Langmuir wave structures registered by FREJA: analysis and modeling

Details Langmuir wave structures registered by FREJA: analysis and modeling Langmuir wave structures registered by FREJA: analysis and modeling

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001adspr..28.1649k&link_type=abstract

Advances in Space Research, Volume 28, Issue 11, p. 1649-1654.

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Scientific paper

A large set of observations of Langmuir emissions generated by super-thermal electron beams in the topside polar ionosphere has been obtained during the recent FREJA mission. Langmuir emissions appeared as a chain of strongly modulated wave packets; in many cases the packet envelopes were modulated periodically. In present report we suggest the theory which explains these observations. We suggest that packet-like waveforms are the beatings of several Langmuir modes. One of modes (the primary mode) appears as a result of beam-plasma instability, other modes - as a result of parametric decay of primary mode to the secondary Langmuir wave and lower-hybrid wave (or as a result of decay cascade). We present the quantitative theory of three-wave interaction L->L+LH which explain many details of FREJA observations.

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