Ion-acoustic double layers and solitons in multispecies auroral beam-plasmas

Details Ion-acoustic double layers and solitons in multispecies auroral beam-plasmas Ion-acoustic double layers and solitons in multispecies auroral beam-plasmas

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992p%26ss...40.1055r&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 40, no. 8, Aug. 1992, p. 1055-1062. Research supported by FNRS.

Computer Science

13

Auroras, Ion Acoustic Waves, Ion Beams, Solitary Waves, Hot Electrons, Hydrogen Ions, Ionospheric Electron Density, Ionospheric Ion Density, Oxygen Ions

Scientific paper

A general analysis for small amplitude ion-acoustic double layers and solitons is developed, taking into account any number of ion beams and their charges, together with cold and hot electrons. For auroral plasma parameters, the analysis predicts the excitation of fast and slow hydrogen (as well as oxygen) beam-acoustic modes, which can be either rarefactive double layers or rarefactive or compressive solitons. Variations in the temperature and beam speed of the hydrogen (oxygen) beam can lead to the conversion of modes from originally rarefactive double layers to rarefactive solitons and finally to compressive solitons. Fast and slow hydrogen beam-acoustic modes are the first to be excited. The excitation of fast and slow oxygen modes is usually possible for larger values of beam speeds of beam temperatures. The typical width and speed of the nonlinear modes are in good agreement with the observations of double layers and solitons by the S3-3 and Viking satellites.

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