Measurements of rapid density fluctuations in the solar wind

D. M. Malaspina, P. J. Kellogg, S. D. Bale, R. E. Ergun

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


The power spectrum of density fluctuations in the solar wind is inferred by tracking small timescale changes in the electron plasma frequency during periods of strong Langmuir wave activity. STEREO electric field waveform data are used to produce time profiles of plasma density from which the density power spectrum is derived. The power spectra obtained by this method extend the observed frequency range by an order of magnitude while remaining consistent with previous results near a few Hertz. Density power spectral indices are found to be organized by the angle between the local magnetic field and the solar wind direction, indicating significant anisotropy in solar wind high-frequency density turbulence.

Original languageEnglish (US)
Pages (from-to)322-327
Number of pages6
JournalAstrophysical Journal
Issue number1
StatePublished - 2010


  • Interplanetary medium
  • Methods: data analysis
  • Turbulence


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