Interpretation of the electric fields measured in an ionospheric critical ionization velocity experiment

Brenning, Nils; Fälthammar, Carl‐Gunne; Haerendel, G.; Kelley, M. C.; Marklund, Göran; Pfaff, R. F.; Providakes, J.; Stenbaek‐Nielsen, H. C.; Swenson, C.; Torbert, R. B.; Wescott, E. M.

doi:10.1029/90ja00692

Cited by 26 publications

(6 citation statements)

References 23 publications

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“…Seed ionization traveling with the neutral gas is needed to start the process. Even though laboratory experiments have repeatedly demonstrated effects that may be attributed to CIV [e.g., Piel, 1990], space experiments have yielded conflicting results [e.g., Totbert, 1990].…”

Section: Introductionmentioning

confidence: 99%

Amplification of critical velocity ionization by associative ionization

Lai¹,

Murad²,

McNeil³

1992

J. Geophys. Res.

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Space experiments to verify the critical ionization velocity (CIV) theory have for the most part involved the release of barium in the ionosphere. It is suggested in this paper that associative ionization (AI) reactions involving barium (i.e., Ba + O --> BaO + + e) may occur in these experiments, and since the products would be indistinguishable from those generated by electron impact ionization (CIV), it is likely that AI-generated ions may be mistaken for those generated by CIV. The electrons formed in AI and by electron impact may be energized by the ion beams, generated by both CIV and AI. The energized electrons may ionize, enhancing the CIV process. In this way, the AI-CIV double process could amplify CIV. The amplification is especially important for sustaining CIV when the CIV energy budget is tight or when the ionization rate due to CIV alone is too low to satisfy Townsend's criterion. The result may have significant implications for the results observed in recent CIV space experiments using barium jets. The AI-CIV double process may offer a plausible explanation for the observed long distance of Ba + ionization. Any other ion beam formation mechanism, such as charge exchange, stripping and reflected ambient ions, can also amplify CIV in a manner similar to AI, although comparison of the relative magnitudes of several of these processes indicates that AI may be the most significant. We suggest an AI-assisted experiment in which a samarium beam could undergo AI, promoting CIV in an accompanying xenon beam.1.

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Section: Introductionmentioning

confidence: 99%

Amplification of critical velocity ionization by associative ionization

Lai¹,

Murad²,

McNeil³

1992

J. Geophys. Res.

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“…Furthermore, numerous stimulated scattering phenomena which directly connect with development of modulational instabilities have been observed in laboratory as well as ionospheric modification experiments 8,[19][20][21][22][23][24][25][26][27] The modulational instability can also be important in experiments on critical ionization velocity phenomena. [28][29][30] When the low frequency electrostatic perturbation propagates in a transverse direction to the incident beam, the instability results in the breaking up of the incident beam into filamentary structures. This phenomenon, known as the filamentational instability, has been extensively studied in gaseous plasmas with or without magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

Modulational and filamentational instabilities of a monochromatic Langmuir pump wave in quantum plasmas

et al. 2015

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The modulational and filamentational instabilities of a monochromatic Langmuir pump wave are investigated for the case of collisionless quantum plasmas, using renormalized quantum linear and nonlinear plasma polarization responses. We obtain the quantum-corrected dispersion equation for the modulational and filamentational instabilities growth rates. It is demonstrated that the quantum effect suppresses the growth rates of the modulational and filamentational instabilities. V C 2015 AIP Publishing LLC. [http://dx.

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“…[1,2]) and in cosmic space (e.g. [3][4][5]), numerous effects still remain unexplained. This relates, in particular, to the case of long-range propagation at a small ion gyroradius of high-β streams.…”

Section: Introductionmentioning

confidence: 99%

Laser-produced plasmas interaction with high pulsed magnetic field

Wołowski¹,

Kasperczuk²,

Parys³

et al. 1999

Plasma Phys. Control. Fusion

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This work presents results of two experiments accomplished at the Institute of Plasma Physics and Laser Microfusion (IPPLM) in Warsaw: (1) investigations of the influence of magnetic field on a laser-produced plasma in the presence or absence of the background plasma, (2) investigations of dynamics of laser-produced plasma in a strong magnetic field. The aim of experiment 1 (performed in collaboration with the Institute of Laser Physics (ILP) RAS, Novosibirsk, Russia) was laboratory simulation of depolarization and deflection of plasma streams drifting across magnetic field in geoplasma background. An Nd:glass laser (5 ns, 2 J) was used to produce the plasma inside Helmholtz coils (B 2 T). The diagnostics for studying the interaction processes were: ion collectors, Langmuir and magnetic probes and an image converter camera. We present a comparison of the effects investigated in that experiment with some phenomena occurring in the geoplasma. In experiment 2 the plasma was produced by means of a Nd:glass laser (1 ns, 10 J) focused on a solid target located in a single-turn coil (B < 20 T). Plasma expansion was investigated with an automated interferometer along the magnetic field lines and perpendicular to these lines. From the interferograms, it has been revealed that the plasma stream has a clear asymmetry for t > 10 ns caused by an unmagnetized ion Rayleigh-Taylor instability.

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Interpretation of the electric fields measured in an ionospheric critical ionization velocity experiment

Cited by 26 publications

References 23 publications

Amplification of critical velocity ionization by associative ionization

Amplification of critical velocity ionization by associative ionization

Modulational and filamentational instabilities of a monochromatic Langmuir pump wave in quantum plasmas

Laser-produced plasmas interaction with high pulsed magnetic field

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