Electrostatic plasma waves and HF auroral hiss generated at low altitude

Journal Article · Wed Feb 01 04:00:00 EST 1989 · Journal of Geophysical Research; (USA)

DOI:https://doi.org/10.1029/JA094iA02p01359· OSTI ID:5839532

Beghin, C; Rauch, J L ^[1]; Bosqued, J M ^[2]

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1. Centre National de la Recherche Scientifique, Orleans (France)
2. Universite Paul Sabatier, Toulouse (France)

Large-amplitude (10 to 100 {mu}V m{sup {minus}1} Hz{sup {minus}1/2}) natural radio emissions in a wide frequency range (100 kHz up to 2 MHz) are frequently observed on board the AUREOL/ARCAD 3 satellite at high latitude and at altitudes between 400 and 2,000 km. The simultaneous measurement of the local cold plasma density allows the identification of cutoff and resonance frequencies. Three different kinds of wave are observed: (1) electrostatic emissions near the local value of the plasma frequency (f{sub p}), (2) electromagnetic whistler mode emissions, sometimes associated with type (1) emissions, and (3) electromagnetic Z mode emissions, also associated with type 1 emissions, but occurring more rarely than the whistler mode emissions and then only when f{sub p} is greater than the electron cyclotron frequency (f{sub ce}). These emissions are always associated with high levels of ELF electrostatic turbulence and a high flux of low-energy precipitating electrons, extending in energy down to the lower limit of the detectors ({approximately} 100 eV). The statistical distribution of the emissions in geomagnetic coordinates shows an occurrence greater than 80% in the polar cusp region and between 25% and 60% in the nightside auroral zone. A generation mechanism for such emissions is proposed, based on the calculation of the growth rate of the kinetic Cherenkov instability, associated with a beamlike suprathermal tail in the parallel distribution of the bulk electron population.

• OSTI ID: 5839532
• Journal Information: Journal of Geophysical Research; (USA), Journal Name: Journal of Geophysical Research; (USA) Vol. 94:A2; ISSN 0148-0227; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

640201* -- Atmospheric Physics-- Auroral
Ionospheric
& Magetospheric Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AURORAL HISS
AURORAL ZONES
CHARGED-PARTICLE PRECIPITATION
CHERENKOV RADIATION
COLD PLASMA
EARTH ATMOSPHERE
EARTH MAGNETOSPHERE
ELECTRODYNAMICS
ELECTROMAGNETIC RADIATION
ELECTRON DENSITY
ELECTRON PRECIPITATION
ENERGY LOSSES
IONOSPHERE
LOSSES
PLANETARY IONOSPHERES
PLASMA
PLASMA DENSITY
PLASMA WAVES
POLAR CUSP
RADIATIONS
RADIOWAVE RADIATION
SATELLITES