Examination of the resonance theory on Pcs by means of an analysis of magnetic fluctuations in the magnetosheath and the magnetosphere
Abstract
Magnetic fluctuations observed in the magnetosheath and the outer magnetosphere with Ogo-5 during 6 months from November 1968, are analyzed to examine the resonance theory that monochromatic waves excited outside the magnetosphere are transmitted in the compressional mode into the magnetosphere, being transmitted further along the closed field lines in the torsional mode and are finally observed as long-period pcs on the Earth's surface. Ten observed results on the wave characteristics of the fluctuations including variance, spectrum, relation to the plasma stream, integrated power, longitudinal dependence are obtained and summarized. The fluctuations in the magnetosheath are found to be dominantly Alfvénic. Several pieces of evidence to support the resonance theory are found.
- Publication:
-
Planetary and Space Science
- Pub Date:
- June 1979
- DOI:
- 10.1016/0032-0633(79)90008-4
- Bibcode:
- 1979P&SS...27..809S
- Keywords:
-
- Geomagnetic Pulsations;
- Magnetopause;
- Magnetosheath;
- Magnetospheric Instability;
- Monochromatic Radiation;
- Fluctuation Theory;
- Lines Of Force;
- Ogo-5;
- Resonant Frequencies;
- Satellite Observation;
- Wave Propagation;
- Geophysics