Remote sensing of plasma density fluctuations and wave source characteristics by means of chorus waves multi point phase correlation analysis

Details Remote sensing of plasma density fluctuations and wave source characteristics by means of chorus waves multi point phase correlation analysis Remote sensing of plasma density fluctuations and wave source characteristics by means of chorus waves multi point phase correlation analysis

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm23a1595a&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM23A-1595

Physics

[2772] Magnetospheric Physics / Plasma Waves And Instabilities, [2774] Magnetospheric Physics / Radiation Belts, [6964] Radio Science / Radio Wave Propagation, [6984] Radio Science / Waves In Plasma

Scientific paper

Discrete ELF/VLF chorus emissions are the most intense electromagnetic plasma waves observed in the radiation belts and in the outer magnetosphere of the Earth. They are supposed to propagate from a localized source region in the vicinity of the magnetic equator towards the magnetic poles approximately along the magnetic field lines. Occurrence of plasma density irregularities along the ray path may lead to loss of the phase coherence of the wave packet. Plasma density irregularities are often present around the plasmapause and in the radiation belts. They occur at scales ranging from a few meters and up to several hundred kilometres and even larger and can have a rather high degree of anisotropy. Such density irregularities result in fluctuations of the refractive index of whistler waves. Inter-satellite cross correlation analysis of whistler wave's phases and amplitudes opens an opportunity to obtain statistical characteristics of the refraction index fluctuations in plasma. Using its dependence upon the plasma density one can reconstruct similar properties of the density fluctuations. We use the similarity between description of the dynamics of weakly connected oscillators under the action of non correlated random forces and wave propagation in randomly fluctuating plasma to determine phase dependences upon duration of signal’s registration time. These dependences are used for inter-satellite cross correlation analysis of Cluster WBD measurements of chorus whistler waves to deduce statistical characteristics of waveform phases and amplitudes. We obtain the statistical characteristics of plasma density fluctuations and evaluate spatial distribution of the irregularities using correlations between the same chorus elements observed in different points of space by four Cluster spacecraft. The results obtained are in a good agreement with the Cluster EFW plasma density variations measurements. The very same correlations are also used for the evaluation of the distance of the source region. This analysis technique proposed can be of a special interest when no additional information is available.

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