Fast Hisslers: a Form of Magnetospheric Radio Emissions.
Abstract
Auroral radio hiss bursts in the frequency range 2-18 kHz were observed, with rise or turn-on times of 20-50 ms, and fall or turn-off times of 20-80 ms. These time scales are too brief to reconcile with the Cerenkov radiation emission mechanism often proposed as the transducer that converts precipitating auroral electron kinetic energy into very-low-frequency radio wave energy. The auroral hiss bursts, called 'fast hisslers', are observed to be 'dispersed;' their arrival time at the receiving site is not simultaneous at all frequencies, but depends on frequency in a way that is consistent with propagation in the whistler mode of electromagnetic wave propagation. Since whistler mode wave propagation at these frequencies occurs only in the earth's magnetosphere, it is inferred that these fast hisslers are of magnetospheric origin. Fine details of some of the amplitude spectra of fast hisslers were examined.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- 1974
- Bibcode:
- 1974PhDT........38S
- Keywords:
-
- Physics: Fluid and Plasma;
- Earth Magnetosphere;
- Hiss;
- Radio Bursts;
- Radio Emission;
- Whistlers;
- Auroral Zones;
- Electromagnetic Radiation;
- Electron Energy;
- Magnetohydrodynamic Stability;
- Propagation Modes;
- Wave Propagation;
- Geophysics