Role of plasma mechanisms in variations of predawn emissions at heights of 200-450 km
Abstract
It is shown that due to the presence of the electron density horizontal gradient at great heights in the terminator the excitation of drift oscillations takes place. The latter excite the proper low magnetosonic oscillations, the energy of which dissipates into heat. Such oscillations modulate the density of electrons which take part in excitation of the oxygen 6300 Å and helium 10830 Å emissions. Estimates of oscillation period and wave phase velocities are in agreement with observational data.
- Publication:
-
Abastumanskaia Astrofizicheskaia Observatoriia Byulleten
- Pub Date:
- 1983
- Bibcode:
- 1983AbaOB..56..207M
- Keywords:
-
- Airglow;
- Ionospheric Drift;
- Ionospheric Electron Density;
- Plasma Oscillations;
- Space Plasmas;
- Terminator Lines;
- Emission Spectra;
- Magnetoacoustic Waves;
- Oxygen Spectra;
- Periodic Variations;
- Sunrise;
- Traveling Ionospheric Disturbances;
- Geophysics