Intermittency analysis and spatial dependence of magnetic field disturbances in the fast solar wind

Y. H. Yang, Sunny Wing-Yee Tam

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Based on Helios measurements, seven quantities of normalized PDF (Probability Distribution Function) associated with magnetic field and its disturbances are utilized to characterize the intermittency in the fast solar wind using Castaing distributions and the idea of "Flatness". The magnetic field fluctuations are found to be more intermittent at farther distances from the sun. The "Flatness" decreases with increasing time scales, with the corresponding PDF eventually approaching Gaussian distributions. Such a transition occurs at a relatively small time scale for the perpendicular component of perturbed field. The increase in "Flatness" with decreasing time scale is more apparent farther from the sun. By examining how the relative energy density of magnetic disturbances at various time scales changes with the mean field, our study supports the idea that the perturbed fields in the fast solar wind in the frequency range considered are consistent with cross-scale redistribution of wave energy favoring larger scales.

Original languageEnglish
Pages (from-to)97-108
Number of pages12
JournalJournal of Atmospheric and Solar-Terrestrial Physics
Volume72
Issue number1
DOIs
Publication statusPublished - 2010 Jan 1

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intermittency
solar wind
disturbances
magnetic field
timescale
disturbance
flatness
magnetic fields
probability distribution functions
sun
wave energy
magnetic disturbances
normal density functions
distribution
analysis
flux density
frequency ranges
energy

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Atmospheric Science
  • Space and Planetary Science

Cite this

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abstract = "Based on Helios measurements, seven quantities of normalized PDF (Probability Distribution Function) associated with magnetic field and its disturbances are utilized to characterize the intermittency in the fast solar wind using Castaing distributions and the idea of {"}Flatness{"}. The magnetic field fluctuations are found to be more intermittent at farther distances from the sun. The {"}Flatness{"} decreases with increasing time scales, with the corresponding PDF eventually approaching Gaussian distributions. Such a transition occurs at a relatively small time scale for the perpendicular component of perturbed field. The increase in {"}Flatness{"} with decreasing time scale is more apparent farther from the sun. By examining how the relative energy density of magnetic disturbances at various time scales changes with the mean field, our study supports the idea that the perturbed fields in the fast solar wind in the frequency range considered are consistent with cross-scale redistribution of wave energy favoring larger scales.",
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