Journal article
Correlated low-frequency electric and magnetic noise along the auroral field lines
Journal of Geophysical Research, Vol.89(A10), pp.8971-8985
10/01/1984
DOI: 10.1029/JA089iA10p08971
Abstract
Dynamics Explorer 1 measurements of intense low-frequency electric and magnetic noise observed at low altitudes over the auroral zone are described. The intensity of both the electric and magnetic fields decreases rapidly with increasing frequency. Most of the energy is at frequencies below the O(+) cyclotron frequency, and some evidence is found for a cutoff or change in spectral slope near that frequency. The magnetic to electric field ratio decreases rapidly with increasing radial distance and also decreases with increasing frequency. The polarization of the electric field in a plane perpendicular to the earth's magnetic field is essentially random. The transverse electric and magnetic fields are closely correlated, with the average Poynting flux directed toward the earth. The total electromagnetic power flow associated with the noise is substantial. Two general models are discussed to interpret these observations, one based on static electric and magnetic fields imbedded in the ionosphere and the other based on Alfven waves propagating along the auroral field lines.
Details
- Title: Subtitle
- Correlated low-frequency electric and magnetic noise along the auroral field lines
- Creators
- D. A. Gurnett - Iowa UnivR. L. Huff - Iowa, UniversityJ. D. Menietti - Iowa UnivJ. L. Burch - Iowa UnivJ. D. Winningham - Southwest Research InstituteS. D. Shawhan - National Aeronautics and Space Administration
- Resource Type
- Journal article
- Publication Details
- Journal of Geophysical Research, Vol.89(A10), pp.8971-8985
- DOI
- 10.1029/JA089iA10p08971
- ISSN
- 0148-0227
- eISSN
- 2156-2202
- Language
- English
- Date published
- 10/01/1984
- Description audience
- PUBLIC
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984627280902771
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