Journal ArticleDOI
Altitude dependent model of the auroral beam and beam-generated electrostatic noise
J. E. Maggs,William Lotko +1 more
Reads0
Chats0
TLDR
In this paper, a height dependent model of the auroral beam and ionosphere was used to investigate the electrostatic noise generated by the beam and the beam pitch angle was assumed to evolve with the first adiabatic invariant conserved.Abstract:
A height dependent model of the auroral beam and ionosphere is used to investigate the electrostatic noise generated by the auroral beam. The beam pitch angle is assumed to evolve with the first adiabatic invariant conserved. The beam generates whistler noise over most of the field line and upper hybrid noise only at low altitudes. Only a very narrow range of beam source densities generates noise without producing such large power fluxes that nonlinear effects are important. The strongest power fluxes in the auroral arc are likely to occur in the altitude range of a few thousand kilometers.read more
Citations
More filters
Journal ArticleDOI
Electrostatic hiss and the beam driven electron acoustic instability in the dayside polar cusp
R. L. Tokar,S. Peter Gary +1 more
TL;DR: In this paper, the upward moving electron beams observed by DE-1 in the dayside polar cusp at 2 to 5 R sub E drive an electrostatic electron acoustic mode, rather than the whistler mode near resonance, as previously concluded.
Journal ArticleDOI
Auroral hiss, Z-mode radiation and auroral kilometric radiation in the polar magnetosphere: DE-1 observations
TL;DR: The first measurements of high-latitude auroral phenomena were provided by the polar-orbiting DE 1 spacecraft as mentioned in this paper, where three types of plasma-wave emissions were observed: auroral hiss, Z-mode radiation, and auroral kilometric radiation.
Journal ArticleDOI
Lower hybrid acceleration and ion evolution in the suprauroral region
Tom Chang,Bruno Coppi +1 more
TL;DR: In this article, it was shown that the accelerated portion of the ions of ionospheric origin in the suprauroral region of the magnetosphere can evolve into conic distributions and propagate upwards along the field lines.
Journal ArticleDOI
Transverse ion acceleration by localized lower hybrid waves in the topside auroral ionosphere
Jorge L. Vago,Paul M. Kintner,S. Chesney,Roger L. Arnoldy,K. A. Lynch,T. E. Moore,Craig Pollock +6 more
TL;DR: In this paper, the authors demonstrate that intense (100-300 mV/m) lower hybrid waves are responsible for transversely accelerating H(+) and O(+) ions to characteristic energies of up to 6 eV.
Journal ArticleDOI
Auroral radio emissions, 1. Hisses, roars, and bursts
James LaBelle,Rudolf A. Treumann +1 more
TL;DR: The Earth's auroral electrons produce copious nonthermal radio emissions of various types, including auroral kilometric radiation (AKR), whistler mode auroral hiss, mode conversion radiation such as auroral roar and MF-burst, and possibly HF/VHF emissions as mentioned in this paper.
References
More filters
Journal ArticleDOI
Satellite measurements and theories of low altitude auroral particle acceleration
TL;DR: 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.
Journal ArticleDOI
Precipitating electron fluxes formed by a magnetic field aligned potential difference
TL;DR: In this paper, a model is developed in which a magnetic field aligned potential difference is assumed to accelerate electrons downward into the atmosphere, and the upgoing backscattered electrons produced by this electron beam may process insufficient kinetic energy to overcome the hypothetical potential difference.
Journal ArticleDOI
Signatures of electric fields from high and low altitude farticles distributions
Paul F. Mizera,Joseph F. Fennell +1 more
TL;DR: In this paper, high altitude measurements of high altitude ions and electrons at auroral energies are used to provide evidence of parallel electric field acceleration over the dusk to midnight auroral regions for both the north and south hemispheres.
Journal ArticleDOI
coherent generation of VLF hiss
TL;DR: In this article, convective beam amplification of incoherent Cerenkov whistler radiation by the beam of precipitating auroral electrons was investigated by using the lowest order WKB wave kinetic equation and linear growth rates.
Journal ArticleDOI
Simultaneous observations of particle precipitations and auroral emissions by the Isis 2 satellite in the 19–24 MLT sector
A. T. Y. Lui,D. Venkatesan,C. D. Anger,Syun-Ichi Akasofu,W.J. Heikkila,J. D. Winningham,J.R. Burrows +6 more
TL;DR: In this article, the optical intensity of the diffuse aurora is found to be produced mainly by a relatively uniform precipitation of low-energy electrons between about 100 eV and 10 keV with monotonic energy spectra.