Statistical and case studies of radio emissions observed near 2f(sub ce) and 3f(sub ce) in the auroral zone

Details Statistical and case studies of radio emissions observed near 2f(sub ce) and 3f(sub ce) in the auroral zone Statistical and case studies of radio emissions observed near 2f(sub ce) and 3f(sub ce) in the auroral zone

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...100.7745w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 100, no. A5, p. 7745-7757

Physics

29

Atmospheric Physics, Auroral Zones, Auroras, Cyclotron Frequency, Radio Emission, Statistical Analysis, Alaska, Diurnal Variations, Electromagnetic Radiation, Geomagnetism, Harmonics, Kp Index, Magnetic Disturbances

Scientific paper

Receivers located at Two Rivers, Alaska (64.9 deg N, 146.9 deg W), and Circle Hot Springs, Alaska (65.5 deg N, 144.7 deg W), have been used to monitor the spectrum between 0.05-4.8 MHz for extended periods. Seasonal and diurnal effects of auroral roar, a weak narrow band radio emission near 2 and 3 times the ionospheric electron cyclotron frequency (f(sub ce)), have been determined. Many individual auroral roar events correlate with magnetic activity, and superposed epoch analysis using planetary K indices shows a correlation between magnetic activity and auroral roar commencement. For a 3f(sub ce) roar event on March 23, 1992, riometer, magnetometer, photometer, and all-sky camera data are available and show that individual bursts of 3f(sub ce) auroral roar are associated with intensifications of the aurora, as was known previously for 2f(sub ce) roar. Finally, two possible generation mechanisms are investigated in detail: nonlinear interaction between lower hybrid and electrostatic upper hybrid waves producing electromagnetic waves, and the feasibility of a lower ionospheric decameter maser for direct generation of X mode waves at harmonics of f(sub ce).

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