evidence and effects of a wave-driven nonlinear current in the equatorial electrojet
Clicks: 9
ID: 168027
1997
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Abstract
Ionospheric two-stream waves and
gradient-drift waves nonlinearly drive a large-scale (D.C.) current in the E-region
ionosphere. This current flows parallel to, and with a comparable magnitude to,
the fundamental Pedersen current. Evidence for the existence and magnitude of
wave-driven currents derives from a theoretical understanding of E-region
waves, supported by a series of nonlinear 2D simulations of two-stream waves and
by data collected by rocket instruments in the equatorial electrojet.
Wave-driven currents will modify the large-scale dynamics of the equatorial
electrojet during highly active periods. A simple model shows how a wave-driven
current appreciably reduces the horizontally flowing electron current of the
electrojet. This reduction may account for the observation that type-I radar
echoes almost always have a Doppler velocity close to the acoustic speed, and
also for the rocket observation that electrojet regions containing
gradient-drift waves do not appear also to contain horizontally propagating
two-stream waves. Additionally, a simple model of a gradient-drift instability
shows that wave-driven currents can cause nonsinusoidal electric fields similar
to those measured in situ.
| Reference Key |
oppenheim1997annalesevidence
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|---|---|
| Authors | ;M. Oppenheim |
| Journal | journal of food measurement and characterization |
| Year | 1997 |
| DOI |
10.1007/s00585-997-0899-z
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| URL | |
| Keywords |
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