Upstream hydromagnetic waves and their association with backstreaming ion populations: ISEE 1 and 2 observations

Hoppe, M. M.; Russell, C. T.; Frank, L. A.; Eastman, T. E.; Greenstadt, E. W.

doi:10.1029/ja086ia06p04471

Cited by 466 publications

(390 citation statements)

References 22 publications

Supporting

Mentioning

357

Contrasting

Order By: Relevance

“…The waves in this interval are righthand polarized in the spacecraft frame (sr > 0). Knowing that the waves are propagating upstream in the plasma rest frame (since cp < 0) and that the hot beam low frequency modes have phase speeds much smaller than the solar wind speed, the sense of polarization in the spacecraft frame will be reversed to that in the plasma rest frame (Hoppe et al, 1981;Hoppe and Russell, 1983). We conclude that the waves in this region are left-hand polarized in the plasma rest frame, and can be identified as an Alfvén/left-hand resonant instability.…”

Section: Alfvén Mode Left-hand Resonant Instabilitymentioning

confidence: 99%

“…The study and identification of these distributions and magnetic signatures gives information about their interrelation and evolution (Fuselier, 1995;Killen et al, 1995) and is central to understand processes such as the thermalization of the solar wind (Greenstadt, 1985;Thomsen et al, 1990;Schwartz and Burgess, 1991;Dubouloz and Scholer, 1995), shock reformation (Burgess, 1989) and Fermi acceleration (Ellison, 1985;Giacalone et al, 1993) Numerous works have studied the plasma waves observed in the foreshock (Greenstadt et al, 1968;Fairfield 1969;Hoppe et al, 1981;Hoppe and Russell, 1983;Russell et al, 1987;Le, 1991; see special issue of J. Geophys. Res, vol 86, (A6) 1981).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Identification of low-frequency kinetic wave modes in the Earth's ion foreshock

Blanco‐Cano¹,

Schwartz

1997

Ann. Geophys.

View full text Add to dashboard Cite

Abstract. In this work we use ion and magnetic field data from the AMPTE-UKS mission to study the characteristics of low frequency ( r p ) waves observed upstream of the Earth's bow shock. We test the application of various plasma-field correlations and magnetic ratios derived from linear Vlasov theory to identify the modes in this region. We evaluate (for a parameter space consistent with the ion foreshock) the Alfvén ratio, the parallel compressibility, the crosshelicity, the noncoplanar ratio, the magnetic compression and the polarization for the two kinetic instabilities that can be generated in the foreshock by the interaction of hot diffuse ions with the solar wind: the left-hand resonant and the right-hand resonant ion beam instabilities. Comparison of these quantities with the observed plasma-field correlations and various magnetic properties of the waves observed during 10 intervals on 30 October 1984, where the waves are associated with diffuse ions, allows us to identify regions with Alfvénic waves and regions where the predominant mode is the right-hand resonant instability. In all the cases the waves are transverse, propagating at angles 33 and are elliptically polarized. Our results suggest that while the observed Alfvén waves are generated locally by hot diffuse ions, the right-handed waves may result from the superposition of waves generated by two different types of beam distribution (i.e. cold beam and diffuse ions). Even when there was good agreement between the values of observed transport ratios and the values given by the theory, some discrepancies were found. This shows that the observed waves are different from the theoretical modes and that mode identification based only on polarization quantities does not give a complete picture of the waves' characteristics and can lead to mode identification of waves whose polarization may agree with theoretical predictions even when other properties can diverge from those of the theoretical modes.

show abstract

Section: Alfvén Mode Left-hand Resonant Instabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Identification of low-frequency kinetic wave modes in the Earth's ion foreshock

Blanco‐Cano¹,

Schwartz

1997

Ann. Geophys.

View full text Add to dashboard Cite

show abstract

“…A review of the variance analysis technique, including error estimates, has been given recently by Sonnerup and Scheible [1998]. A variety of different error estimates have appeared in the literature [Sonnerup, 1971;Lepping and Behannon, 1980;Hoppe et al, 1981;Kawano and Higuchi, 1995], but a complete analytical treatment is lacking. The present paper addresses the issue of statistical uncertaintie• when MVA is applied to actual experimental data, starting from first principles and employing the analytical approach.…”

Section: Introductionmentioning

confidence: 99%

Error estimates for minimum variance analysis

Khrabrov¹,

Sonnerup²

1998

J. Geophys. Res.

103

View full text Add to dashboard Cite

Abstract. Analytical estimates of errors, associated with random statistical noise in magnetic field and other data to which the minimum/maximum variance analysis technique is commonly applied, are derived from first principles. A systematic expansion procedure is used in which the expansion parameter is proportional to the noise amplitude and inversely proportional to the square root of the number of vector data samples, K. The two special cases where the signal-tonoise ratio is large and small are considered for arbitrary noise distributions. The ideal case of small errors and isotropic Gaussian noise allows determination of uncertainty cones of elliptic cross section for all three eigenvectors, Xl, x2, x3, and uncertainty intervals for all three eigenvalues, X1, X2, X3, of the variance matrix, all in terms of the eigenvalues themselves and the number of data points. Denoting the angular standard deviation (in radians) of vector xi toward or

show abstract

“…WWs have been observed in nearly every space plasma environment including, but not limited to, the terrestrial magnetosphere [e.g., Russell et al, 1969], in the solar wind [e.g., Coroniti et al, 1982], upstream of IP shocks [e.g., Russell et al, 1983;Wilson III et al, 2009], downstream of IP shocks [Moullard et al, 1998[Moullard et al, , 2001], upstream of planetary bow shocks [e.g., Hoppe et al, 1981], and in the ramp of supercritical IP shocks [Wilson III et al, 2012].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic waves and electron anisotropies downstream of supercritical interplanetary shocks

et al. 2013

View full text Add to dashboard Cite

[1] We present waveform observations of electromagnetic lower hybrid and whistler waves with f ci ≪ f < f ce downstream of four supercritical interplanetary shocks using the Wind search coil magnetometer. The whistler waves were observed to have a weak positive correlation between dB and normalized heat flux magnitude and an inverse correlation with T eh /T ec . All were observed simultaneous with electron distributions satisfying the whistler heat flux instability threshold and most with T ⊥ h /T k h > 1.01. Thus, the whistler mode waves appear to be driven by a heat flux instability and cause perpendicular heating of the halo electrons. The lower hybrid waves show a much weaker correlation between dB and normalized heat flux magnitude and are often observed near magnetic field gradients. A third type of event shows fluctuations consistent with a mixture of both lower hybrid and whistler mode waves. These results suggest that whistler waves may indeed be regulating the electron heat flux and the halo temperature anisotropy, which is important for theories and simulations of electron distribution evolution from the Sun to the Earth.

show abstract

Upstream hydromagnetic waves and their association with backstreaming ion populations: ISEE 1 and 2 observations

Cited by 466 publications

References 22 publications

Identification of low-frequency kinetic wave modes in the Earth's ion foreshock

Identification of low-frequency kinetic wave modes in the Earth's ion foreshock

Error estimates for minimum variance analysis

Electromagnetic waves and electron anisotropies downstream of supercritical interplanetary shocks

Contact Info

Product

Resources

About