Physics – Plasma Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh53a1310m&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SH53A-1310
Physics
Plasma Physics
[2159] Interplanetary Physics / Plasma Waves And Turbulence, [2194] Interplanetary Physics / Instruments And Techniques, [7863] Space Plasma Physics / Turbulence, [7894] Space Plasma Physics / Instruments And Techniques
Scientific paper
Millisecond fluctuations in Langmuir wave frequency observed using STEREO/WAVES are used to track small-scale density turbulence in the solar wind, revealing density fluctuations between 7.7 Hz and 185 Hz for the first time. The density power spectra derived from these observations match closely with previously observations, supporting the soundness of the frequency tracking technique. The density power spectra are well fit by a power law, the index of which varies from -2 to -1.6 with the angle between the local magnetic field and the solar wind direction. This organization was previously seen in magnetic field turbulence observations. Such coupling between magnetic and density fluctuations at small scales is indicative of compressional turbulence associated with magnetosonic and/or kinetic Alfvén waves. Integrated density fluctuation spectral power density is organized by solar wind speed, hinting that solar wind density turbulence anisotropy evolves with distance from the sun. Further, density fluctuation distributions are strongly Lorentizan, suggesting intermittent density turbulence at small scales.
Bale Stuart
Ergun Robert E.
Kellogg Paul J.
Malaspina D.
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