Indices of geomagnetic pulsations

Troitskaya, V.A.; Gulelmi, A. V.; Большакова, О В; Matveyeva, E. T.; Schepetnov, R.V.

doi:10.1016/0032-0633(72)90170-5

Cited by 11 publications

(5 citation statements)

References 10 publications

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“…More to the point, they showed that the relation between the frequency F in millihertz of ground Pc 3, 4 pulsations and the IMF magnitude in nanoteslas was F = 6.15B. A similar relationship was reported by Troitskaya et al [1972]. Figure 1 Figure 2 shows one version of the correlations developed by Gul'elmi.…”

Section: Period Of Pc 3 4 Pulsationssupporting

confidence: 71%

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Solar wind controlled pulsations: A review

Odera¹

1986

Reviews of Geophysics

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Studies of the solar wind controlled Pc 3, 4 pulsations by early and recent researchers are highlighted. The review focuses on the recent observations, which cover the time during the International Magnetospheric Study (IMS). Results from early and recent observations agree on one point, that is, that the Pc 3, 4 pulsations are influenced by three main solar wind parameters, namely, the solar wind velocity V sw , the IMF orientation θ xB , and magnitude B. The results can be interpreted, preferably, in terms of an external origin for Pc 3, 4 pulsations. This implies, essentially, the signal model, which means that the pulsations originate in the upstream waves (in the interplanetary medium) and are transported by convection to the magnetopause, where they couple to oscillations of the magnetospheric field lines.

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Section: Period Of Pc 3 4 Pulsationssupporting

confidence: 71%

“…1. Average interplanetary magnetic field magnitude versus periød of magneic pulsations seen at a mid-latitude observatory [Troitskaya et al, 1972]. evidence that some Pc 3, 4 may originate from waves in the interplanetary medium.…”

Section: Period Of Pc 3 4 Pulsationsmentioning

confidence: 93%

Solar wind controlled pulsations: A review

Odera¹

1986

Reviews of Geophysics

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“…IMF control of the Pc 3 wave power can be interpreted in terms of the magnetic geometry that allows upstream waves (Russell and Hoppe, 1983;Lin et al, 1991) generated near the nose of the bow shock to propagate to the dayside magnetopause. An empirical relationship, f (mHz) = 6B (nT) (e.g., Troitskaya et al, 1972), relates the upstream wave frequency to the IMF magnitude which was between -5 and 3 nT between 18:00 UT and 24:00 UT. This implies that upstream wave frequencies fell in the ranges 18-30 mHz during the interval studied.…”

Section: Energy Source and Damping Of Cavity Wavesmentioning

confidence: 99%

A Possible Signature of Magnetic Cavity Mode Oscillations in ISEE Spacecraft Observations.

Kivelson

Cao

McPherron

et al. 1997

J. geomagn. geoelec

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The structure of magnetohydrodynamic waves in the terrestrial magnetosphere is controlled by the dispersion relations of the wave modes, the inhomogeneities of the system and the boundary conditions. If the waves are confined within the magnetospheric cavity with proper boundary conditions, two types of spectra are predicted by MHD theory. One is a discrete compressional spectrum and the other is a continuous shear Alfven spectrum. The discrete spectrum refers to compressional eigenmodes with spatially constant eigenfrequencies. The continuous shear Alfven spectrum corresponds to field line resonances with spatially varying resonant frequencies. There have been many reports of observations consistent with the theoretical predictions for shear Alfven waves. However, only a few spacecraft observations of the global cavity eigenmodes or the coupling between the two modes have been reported. Here we report an observation using ISEE 1 and 2 spacecraft magnetometer data. On a quiet day with low solar wind dynamic pressure and low geomagnetic activity, the ISEE 1 and 2 spacecraft identified a compressional wave with constant frequency throughout most of its inbound orbit in the outer magnetosphere. Multiple harmonics of shear Alfven waves with spatially varying frequencies were observed in the azimuthal component. Evidence of the coupling between these two waves in found. Comparing our observations with the results of a computer simulation in a dipole field, we find qualitative (not quantitative) agreement. We also consider why so few examples of radially-extended monochromatic compressional oscillations have been found. We conclude that the exceptional circumstances required for development and identification of these wave structures occur very rarely.

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“…The travel of the region of generation across the magnetic shells in the course of the Pcl series is investigated by Fraser [24], Often [25], Antonova et al [26], Dovbnya et al [27] (see also [28,29]). We present here the results of additional investigations, undertaken to reveal the nature of the non-stationary character of the carrier frequency of Pcl.…”

Section: Cos ~mentioning

confidence: 99%

Diagnostics of the magnetosphere and interplanetary medium by means of pulsations

Gulelmi¹

1974

Space Sci Rev

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The possibility of diagnostics of the interplanetary magnetic field using the data of ground observations of Pc3, 4 pulsations is investigated. Both empirical and theoretical foundations of this method are discussed. In the shorter-period range (Pcl, Pil, Ipdp) the methods of qualitative diagnostics of non-stationary processes in the quiet and disturbed magnetosphere are considered. In conclusion, we shall briefly consider the problems, arising when estimating the amplitude of the hydromagnetic waves in the regions of generation.

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Indices of geomagnetic pulsations

Cited by 11 publications

References 10 publications

Solar wind controlled pulsations: A review

Solar wind controlled pulsations: A review

A Possible Signature of Magnetic Cavity Mode Oscillations in ISEE Spacecraft Observations.

Diagnostics of the magnetosphere and interplanetary medium by means of pulsations

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