Propagation and dispersion of electrostatic waves in the ionospheric E region

Iranpour, K.; Pécseli, H. L.; Trulsen, J.; Bahnsen, A.; Primdahl, F.; Rinnert, K.

doi:10.1007/s00585-997-0878-4

Cited by 11 publications

(25 citation statements)

References 16 publications

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“…4, the increase in T e is expected to be minute, but for the somewhat larger down-leg fields, E 0 ≈60-70 mV/m, nontrivial enhancements of T e are anticipated, but not observed for the present conditions. The wave propagation velocities, for instance, as found by Iranpour et al (1997), Krane et al (2000) and Dyrud et al (2006) are best explained by an electron temperature of approximately 400 K. Also other reports (Pfaff et al, 1992) noted the lack of electron temperature enhancements for conditions similar to ours. A previous study (Dyrud et al, 2006) attempted to explain the low electron temperatures by thermal conduction to the colder regions below the enhanced wave activity, but used too low numerical values for the electron energy loss per collision, by taking this energy loss to be at most an order of magnitude larger than for inelastic collisions.…”

Section: Numerical Simulationssupporting

confidence: 84%

“…U 6 and U 2 being small, these two difference signals referring to probe-sets perpendicular to the rocket axis. For the small time separations relevant for the present analysis we do not find significant differences between signals such as U 6 and U 5 either, but note that the correlation times for these signals are somewhat different (Iranpour et al, 1997;Krane et al, 2000).…”

Section: Analysis Of Rocket Datamentioning

confidence: 51%

“…Intermittency effects have been recognized in several different laboratory plasma devices also by e.g. Fredriksen et al (2003a,b) and Kervalishvili et al (2008). The analysis is not necessarily based on structure functions as discussed in the present work.…”

Section: Introductionmentioning

confidence: 71%

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Structure functions and intermittency in ionospheric plasma turbulence

Dyrud

Krane

Oppenheim³

et al. 2008

Nonlin. Processes Geophys.

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Abstract. Low frequency electrostatic turbulence in the ionospheric E-region is studied by means of numerical and experimental methods. We use the structure functions of the electrostatic potential as a diagnostics of the fluctuations. We demonstrate the inherently intermittent nature of the low level turbulence in the collisional ionospheric plasma by using results for the space-time varying electrostatic potential from two dimensional numerical simulations. An instrumented rocket can not directly detect the one-point potential variation, and most measurements rely on records of potential differences between two probes. With reference to the space observations we demonstrate that the results obtained by potential difference measurements can differ significantly from the one-point results. It was found, in particular, that the intermittency signatures become much weaker, when the proper rocket-probe configuration is implemented. We analyze also signals from an actual ionospheric rocket experiment, and find a reasonably good agreement with the appropriate simulation results, demonstrating again that rocket data, obtained as those analyzed here, are unlikely to give an adequate representation of intermittent features of the low frequency ionospheric plasma turbulence for the given conditions.

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Section: Numerical Simulationssupporting

confidence: 84%

Section: Analysis Of Rocket Datamentioning

confidence: 51%

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Structure functions and intermittency in ionospheric plasma turbulence

Dyrud

Krane

Oppenheim³

et al. 2008

Nonlin. Processes Geophys.

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“…Values for positive spectral indices have been reported by Prakash et al (1971), but these apply only to some unspecified narrow spectral subranges and they are not included in the present summary. Some rocket experiments (Pécseli et al, 1989Iranpour et al, 1997) report E region turbulent spectra in a colour-coded version, where a spectral index is not readily determined with any significant accuracy. Within the uncertainty, the results do not, however, in contradiction with similar data in Table 2.…”

Section: Space Observationsmentioning

confidence: 99%

Spectral properties of electrostatic drift wave turbulence in the laboratory and the ionosphere

Pécseli

2015

Ann. Geophys.

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Abstract. Low-frequency electrostatic drift wave turbulence has been studied in both laboratory plasmas and in space. The present review describes a number of such laboratory experiments together with results obtained by instrumented spacecraft in the Earth's near and distant ionospheres. The summary emphasizes readily measurable quantities, such as the turbulent power spectra for the fluctuations in plasma density, potential and electric fields. The agreement between power spectra measured in the laboratory and in space seems to be acceptable, but there are sufficiently frequent counterexamples to justify a future dedicated analysis, for instance by numerical tools, to explain deviations. When interpreting spectra at low ionospheric altitudes, it is necessary to give attention to the DC ionospheric electric fields and the differences in the physics of electron-ion collisions and collisions of charged particles with neutrals for cases with significant Hall drifts. These effects modify the drift wave spectra. A dedicated laboratory experiment accounted for some of these differences.

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“…We can see from (14) that the phase velocities of these waves are smaller than the ion-acoustic velocity and since the growth rate for these waves is maximal their amplitudes must be maximal. Iranpour et al [3], analyzing rocket measurements of ionospheric waves during the ROSE project [6], found low-velocity waves with large amplitudes. Phase velocities of the waves increase with increasing frequency.…”

Section: Ion-acoustic Instabilitymentioning

confidence: 99%

On the Ion-Acoustic Instability in the Ionospheric E-Region

Sukovatov¹

2001

Phys. Scr.

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The linear theory of the ion-acoustic instability in the E-region ionospheric plasma has been studied. The instability can generate ion-acoustic waves with dispersion equation o c s k and with wavelengths of order of a metre in the region of small aspect angles y < 1 . This instability can be used for interpretation of coherent backscatter type I events. Considering the ion-acoustic instability it is also possible to explain rocket measurements during the ROSE project of waves with phase velocities smaller than the ion-acoustic velocity and dependent on frequency.

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Propagation and dispersion of electrostatic waves in the ionospheric E region

Cited by 11 publications

References 16 publications

Structure functions and intermittency in ionospheric plasma turbulence

Structure functions and intermittency in ionospheric plasma turbulence

Spectral properties of electrostatic drift wave turbulence in the laboratory and the ionosphere

On the Ion-Acoustic Instability in the Ionospheric E-Region

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