Turbulence of the inner solar wind at solar maximum: Coronal radio sounding with Galileo in 1999/2000

Ефимов, А. И.; Чашей, И. В.; Bird, M. K.; Plettemeier, Dirk; Edenhofer, P.; Wohlmuth, R.; Samoznaev, L. N.; Луканина, Л. А.

doi:10.1016/j.asr.2005.02.030

Cited by 13 publications

(9 citation statements)

References 17 publications

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“…Using the ion instrument and studying the frequency range 6 · 10 À6 À 6 · 10 À3 Hz, it is shown that turbulence intensity and development are different in slow and fast solar winds. Similar conclusions have been reached looking at even higher frequency density fluctuations (f < 0.6 Hz) as estimated using remote coronal sounding experiments (Efimov et al, 2005). In addition, those observations show spectral breakpoints where density fluctuation spectra flatten out at both low and high frequencies (in the frequency range 0.01-1 Hz).…”

Section: Density Fluctuationssupporting

confidence: 59%

“…Figure adopted from Fig. 2 in Efimov et al (2005). significant progress in explaining energy conversion, transport and other processes in the solar atmosphere. It is involved on all scales, starting from CMEs where it is believed to be crucial for allowing CMEs to escape the Sun and ending with the smallest scales where microreconnection can be one of the ways energy is dissipated in solar wind turbulence.…”

Section: Reconnectionmentioning

confidence: 99%

“…1. Density fluctuation spectra as estimated from radio sounding of solar corona during the Galileo spacecraft solar conjunction Efimov et al, 2005. The spectra show two spectral breakpoints where spectra flattens at low and high frequencies.…”

Section: Reconnectionmentioning

confidence: 99%

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Low-frequency electric field and density fluctuation measurements on Solar Orbiter

Vaivads¹,

Eriksson²,

André³

et al. 2007

Advances in Space Research

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Section: Density Fluctuationssupporting

confidence: 59%

Section: Reconnectionmentioning

confidence: 99%

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Low-frequency electric field and density fluctuation measurements on Solar Orbiter

Vaivads¹,

Eriksson²,

André³

et al. 2007

Advances in Space Research

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“…We do not believe that the observations presented in this paper are consistent with wave reflections at density gradients as hypothesized by Kellogg et al [1999a, 1999b]. General reflection at a density gradient should produce a reflected wave at an arbitrary angle to the incoming wave, assuming that the solar wind plasma density is not homogeneous and that density gradients are not confined to the B direction [ Unti et al , 1973; Efimov et al , 2005]. Considering the ubiquity of density gradients in the solar wind plasma, one would expect reflection to ensure that nearly all Langmuir events possess significant transverse structure.…”

Section: Discussionmentioning

confidence: 76%

Observations of three‐dimensional Langmuir wave structure

Malaspina

Ergun

2008

J. Geophys. Res.

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[1] Measurements of the three-dimensional structure of solar wind Langmuir waves made by the STEREO spacecraft are presented. Langmuir wave structure is studied using hodograms classified as one-, two-, or three-dimensional. Multi-dimensional Langmuir waves are both less-often observed than one-dimensional events and clustered in time. These observations show that a minority of Langmuir waves have electric fields transverse to the local magnetic field direction. We present a new explanation for this transverse structure based on an interpretation of Langmuir waves as eigenmodes of solar wind density cavities. These new observations are compared with previous theories for transverse wave structure and the eigenmode interpretation is found to be consistent with STEREO observations.

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“…Some recent results obtained using the highly-stable signals of the Galileo and Ulysses spacecraft were presented by Chashei et al (2005) and Efimov et al (2005). Some recent results obtained using the highly-stable signals of the Galileo and Ulysses spacecraft were presented by Chashei et al (2005) and Efimov et al (2005).…”

Section: Introductionmentioning

confidence: 99%

Coronal Radio Sounding Experiments with Mars Express: Scintillation Spectra during Low Solar Activity

Ефимов¹,

Луканина²,

Samoznaev³

et al. 2010

AIP Conference Proceedings

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LASCO FeXIV and FeX observations of the solar coronal rotation during the recent solar activity minimum AIP Conf. Proc. 471, 297 (1999); 10.1063/1.58763 Three cycle quasiperiodicity in solar wind from polar coronal holes and the size of solar activity cycle 23 AIP Conf.Abstract. Coronal radio sounding observations were carried out with the radio science experiment MaRS on the ESA spacecraft Mars Express during the period from 25 August to 22 October 2004. Differential frequency and log-amplitude fluctuations of the dual-frequency signals were recorded during a period of low solar activity. The data are applicable to low heliographic latitudes, i.e. to slow solar wind. The mean frequency fluctuation and power law index of the frequency fluctuation temporal spectra are determined as a function of heliocentric distance. The radial dependence of the frequency fluctuation spectral index α reflects the previously documented flattening of the scintillation power spectra in the solar wind acceleration region. Temporal spectra of S-band and X-band normalized log-amplitude fluctuations were investigated over the range of fluctuation frequencies 0.01 Hz < ν < 0.5 Hz, where the spectral density is approximately constant. The radial variation of the spectral density is analyzed and compared with Ulysses 1991 data, a period of high solar activity. Ranging measurements are presented and compared with frequency and log-amplitude scintillation data. Evidence for a weak increase in the fractional electron density turbulence level is obtained in the range 10-40 solar radii.

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Turbulence of the inner solar wind at solar maximum: Coronal radio sounding with Galileo in 1999/2000

Cited by 13 publications

References 17 publications

Low-frequency electric field and density fluctuation measurements on Solar Orbiter

Low-frequency electric field and density fluctuation measurements on Solar Orbiter

Observations of three‐dimensional Langmuir wave structure

Coronal Radio Sounding Experiments with Mars Express: Scintillation Spectra during Low Solar Activity

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