Magnetic field-aligned potential drops due to electrostatic ion cyclotron turbulence
Journal Article
·
· Geophys. Res. Lett.; (United States)
Measurements of DC and AC electric fields and plasma densities on the S3-3 satellite have shown that electrostatic ion cyclotron (EIC) turbulence is associated with significant DC electric fields parallel to auroral field lines. The EIC mode has been identified in regions of strong DC electric fields and magnetic field aligned currents by AC electric field and density fluctuations with frequency components between the local hydrogen gyrofrequency and its harmonics, and by wave vector polarization primarily perpendicular to the magnetic field at wavelengths of an ion gyroradius. The anomalous resistivity has been computed for measured AC electric fields of 50 mV/m in the EIC mode, yielding approx.1 mV/m DC parallel electric fields for measured currents of approx.10 ..mu..A/m/sup 2/. This theoretical results implies that several kV potential drops will occur if the anomalous resistivity region extends over several thousand kilometers along auroral field lines. This is adequate to accelerate auroral particles to observed energies and consistent with the scale height over which parallel electric fields and EIC turbulence are statistically observed on S3-3.
- Research Organization:
- Space Sciences Laboratory, University of California. Berkeley, CA 94720
- OSTI ID:
- 5040329
- Journal Information:
- Geophys. Res. Lett.; (United States), Journal Name: Geophys. Res. Lett.; (United States) Vol. 5:2; ISSN GPRLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
640201* -- Atmospheric Physics-- Auroral
Ionospheric
& Magetospheric Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACCELERATION
AURORAL ZONES
BREMSSTRAHLUNG
CYCLOTRON RADIATION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
ION WAVES
PHYSICAL PROPERTIES
PLASMA ACCELERATION
PLASMA DENSITY
PLASMA WAVES
RADIATIONS
TURBULENCE
VOLTAGE DROP
Ionospheric
& Magetospheric Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACCELERATION
AURORAL ZONES
BREMSSTRAHLUNG
CYCLOTRON RADIATION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
ION WAVES
PHYSICAL PROPERTIES
PLASMA ACCELERATION
PLASMA DENSITY
PLASMA WAVES
RADIATIONS
TURBULENCE
VOLTAGE DROP