Naturally enhanced ion acoustic fluctuations seen at different wavelengths

Details Naturally enhanced ion acoustic fluctuations seen at different wavelengths Naturally enhanced ion acoustic fluctuations seen at different wavelengths

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...10621503f&link_type=abstract

Journal of Geophysical Research, Volume 106, Issue A10, p. 21503-21516

Physics

8

Ionosphere: Auroral Ionosphere, Ionosphere: Particle Precipitation, Ionosphere: Plasma Waves And Instabilities, Magnetospheric Physics: Plasma Waves And Instabilities

Scientific paper

We present European Incoherent Scatter (EISCAT) Svalbard Radar observations of enhanced incoherent scatter ion-acoustic spectra with transmitted frequencies slightly shifted relative to the radar central frequency. This study confirms the initial findings that (1) the naturally enhanced ion acoustic lines sometimes show asymmetric power profiles and (2) the amplitude enhancement of upgoing and downgoing ion-acoustic waves occurs at somewhat different altitudes and different power levels. These observational facts are modeled using the parametric decay of beam driven Langmuir wave in an inhomogeneous medium. It is shown that the density gradient with altitude as well as the collisions contribute to an altitude variation of ion-acoustic spectra and may account for the observed signatures. It is also responsible for the transition from upshifted to downshifted enhanced ion lines. Our model shows that the power radiated by enhanced spectra varies with the wavelength and that the power difference between two wavelengths varies with altitude.

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