Journal ArticleDOI
Satellite measurements and theories of low altitude auroral particle acceleration
TLDR
In this article, the S3-3 satellite results on DC electric fields, field-aligned currents, and waves are described, interpreted theoretically, and applied to the understanding of auroral particle acceleration at altitudes below 8000 km.Abstract:
Several previous and new S3-3 satellite results on DC electric fields, field-aligned currents, and waves are described, interpreted theoretically, and applied to the understanding of auroral particle acceleration at altitudes below 8000 km. These results include the existence of two spatial scale sizes (less than 0.1 degree and a few degrees invariant latitude) in both the perpendicular and parallel electric fields; the predominance of S-shaped rather than V-shaped equipotential contours on both spatial saales; the correlated presence of field-aligned currents, low frequency wave turbulence, coherent ion cyclotron wave emissions and accelerated upmoving ions and downgoing electrons; intense waves inside electrostatic shocks and important wave-particle interactions therein; correlations of field-aligned currents with magnetospheric boundaries that are determined by convection electric field measurements; electron acceleration producing discrete auroral arcs in the smaller scale fields and producing inverted-V events in the larger scale fields; ion and electron acceleration due to both wave-particle interactions and the parallel electric fields. Further analyses of acceleration mechanisms and energetics are presented.read more
Citations
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Journal ArticleDOI
Auroral radio emissions at the outer planets: Observations and theories
TL;DR: In this article, the authors review both observational and theoretical aspects of the generation of auroral radio emissions at the outer planets, trying to organize the former in a coherent frame set by the latter.
Journal ArticleDOI
Diffuse, monoenergetic, and broadband aurora: The global precipitation budget
TL;DR: In this article, the authors developed an auroral precipitation model which separately categorizes the discrete aurora and both the electron and ion diffuse aurora, based on functional fits to the solar wind coupling function which best predicts auroral power.
Journal ArticleDOI
Dynamics of magnetosphere-ionosphere coupling including turbulent transport
Robert L. Lysak,Christian T. Dum +1 more
TL;DR: In this paper, the dynamics of magnetosphere-ionosphere coupling were investigated by means of a two-dimensional two-fluid MHD model including anomalous resistivity, and the system evolved toward an electrostatic structure, with the perpendicular electric field having a shorter scale than the field-aligned current.
Journal ArticleDOI
Evidence for kinetic Alfvén waves and parallel electron energization at 4-6 RE altitudes in the plasma sheet boundary layer
John R. Wygant,A. Keiling,Cynthia A Cattell,Robert L. Lysak,M. Temerin,F. S. Mozer,Craig Kletzing,J. D. Scudder,V. Streltsov,William Lotko,Christopher T. Russell +10 more
TL;DR: In this paper, it was shown that the smaller-scale kinetic Alfven waves have durations in the spacecraft frame of 250 ms to 1 s (but may have shorter time durations since the Nyquist frequency of the magnetic field experiment is � 4 Hz.).
Journal ArticleDOI
Polar spacecraft based comparisons of intense electric fields and Poynting flux near and within the plasma sheet-tail lobe boundary to UVI images: An energy source for the aurora
John R. Wygant,A. Keiling,Cynthia A Cattell,M. Johnson,Robert L. Lysak,M. Temerin,F. S. Mozer,Craig Kletzing,J. D. Scudder,W. K. Peterson,Christopher T. Russell,George K. Parks,Mitchell J. Brittnacher,James F. Spann +13 more
TL;DR: In this article, the Poynting flux associated with the perturbation fields measured at these altitudes is about 1-2 ergs per square centimeters per second and is directed along the average magnetic field direction toward the ionosphere.
References
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Book
Introduction to Plasma Physics
TL;DR: In this article, the authors define the concept of debye shielding and define a set of criteria for plasmas in terms of temperature, debye Shielding, and debye shielding.
Journal ArticleDOI
Introduction to Plasma Physics
TL;DR: In this article, the authors define the concept of debye shielding and define a set of criteria for plasmas in terms of temperature, debye Shielding, and debye shielding.
Journal ArticleDOI
Topside current instabilities
J. M. Kindel,Charles F. Kennel +1 more
TL;DR: Topside ionospheric instabilities of electrostatic ion acoustic and ion cyclotron waves to field aligned currents in single and multiion plasmas are discussed in this paper.
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Parallel electric fields
TL;DR: In this paper, a steady state one-dimensional model is used to estimate the electron current along a field line from the auroral zone to the plasmasheet when a potential difference exists between its ends.