Generation of electrostatic waves by discontinuous electron distributions

Details Generation of electrostatic waves by discontinuous electron distributions Generation of electrostatic waves by discontinuous electron distributions

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jgr...10412415y&link_type=abstract

Journal of Geophysical Research, Volume 104, Issue A6, p. 12415-12430

Physics

Plasma Physics

5

Magnetospheric Physics: Plasma Waves And Instabilities, Space Plasma Physics: Wave/Particle Interactions, Space Plasma Physics: Waves And Instabilities, Magnetospheric Physics: Magnetotail

Scientific paper

This paper presents studies of narrowband electrostatic waves (NEN) in the distant lobe region and electrostatic waves in the bow shock and slow mode shocks. Geotail measurements from the tail lobe region show a two-humped feature in the low-energy region of the parallel electron distributions correlated with lobe NEN emissions. Unstable waves were found in our linear dispersion and simulation studies initialized with the measured electron distributions. The wave energy density, wave frequency, and waveform were comparable with those from spacecraft observations. The electron contribution to bow shock and slow mode shock wave spectra was examined with the use of a parallel electron distribution model function that featured flat tops and single peaks drifting with speeds of the order of the effective electron thermal speed. The model assumed a possible discontinuity in the parallel distribution. Results from the model included waves with frequencies above the ion plasma frequency (ωpi) but well below the electron plasma frequency (ωpe) as well as broadband, higher-frequency waves extending to ωpe. In addition, wave frequencies increased and growth rates and wave energy density decreased as the peak offset speed increased and the peak height decreased during a shock penetration. Dispersions from both linear theory and simulation were obtained in our studies. The unstable waves had a broad k range with kλD exceeding unity. For waves with frequencies well below ωpe, the frequency decreased further during the evolution of the electron distribution.

Affiliated with

Also associated with

No associations

Rating

Generation of electrostatic waves by discontinuous electron distributions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Generation of electrostatic waves by discontinuous electron distributions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Generation of electrostatic waves by discontinuous electron distributions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1502745