Investigation Of Auroral Hiss Observations On The Ground: Application To Remote Sensing Of Auroral Magnetosphere

Dissertation (Ph.D.) University of Alaska Fairbanks, 2001Observed both on the ground at high latitudes and on spacecraft in the auroral zone, auroral hiss (AH) emissions (~1 kHz to ~1 MHz) are intense electromagnetic emissions emitted from the auroral region. Standard whistler mode propagation theory in a smooth magnetosphere predicts that AH generated at large wave-normal angles along the auroral field lines by Cerenkov resonance cannot penetrate to the ground. This thesis presents a new mechanism of AH propagation to the ground in which presence of density depletions along the field lines in the auroral zone and meter-scale density irregularities at altitudes 5000--20,000 km) propagates to lower altitudes (16,000 km while for frequencies 12--20 kHz it should be <8000 km, (b) parallel resonance energy of the energetic electrons generating the frequencies should be