Hydromagnetic waves in solar plasma from remote sensing measurements of Helios
Abstract
The fine structure of periodicity during solar occultations is inferred from the temporal variations of columnar electron content measurements made by the Helios space probes. A maximum entropy spectral analysis reveals significant frequency peaks within the range 0.2 to 3 mHz. A comparison with Helios Faraday rotation measurements indicates hydromagnetic waves. This provides experimental evidence that such waves, with a typical fundamental period of 1 hour, exist in the solar corona.
- Publication:
-
On Radio Frequencies in Aerospace (ESA-TT-704)
- Pub Date:
- December 1981
- Bibcode:
- 1981orfa.rept...47E
- Keywords:
-
- Electron Flux Density;
- Magnetohydrodynamic Waves;
- Solar Wind;
- Faraday Effect;
- Helios Satellites;
- Maximum Entropy Method;
- Periodic Variations;
- Solar Corona;
- Solar Eclipses;
- Communications and Radar