Physics – Geophysics
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ucla.reptx....s&link_type=abstract
Final Report, 25 Nov. 1988 - 28 Feb. 1990 California Univ., Los Angeles. Inst. of Geophysics and Planetary Physics.
Physics
Geophysics
D Region, Detection, Earth Ionosphere, Electron Precipitation, Energetic Particles, Extremely Low Frequencies, Particle Emission, Particle Precipitation, Cavity Resonators, Earth (Planet), Oscillations, Perturbation, Polar Regions, Precipitation Particle Measurement, Proton Precipitation, Proton Resonance, Solar Activity
Scientific paper
The scientific objective of this project was to investigate the effects of relativistic electron precipitation on the characteristics of the Schumann resonances. The method of investigation was to establish a Schumann resonance and ELF observing station in Alaska to provide high-latitude measurements for comparison against similar measurements made at midlatitude stations in California and Australia. Observations of Schumann resonance eigenfrequencies and Q-factors during May to October, 1989 showed discontinuous changes that correlated well with the occurrence of several large solar events that produced notable enhancements in the intensities of magnetospheric relativistic electrons 1.2 less than E sub e less than 2 MeV, energetic protons E sub p greater than 1 MeV, and solar x rays 0.5 to 8A. The observed correlation suggests that the solar events produced a globally significant perturbation in the conductivity of the D-region forming the upper boundary of the earth-ionosphere cavity to produce the observed Schumann resonance response. A more refined analysis of the data will permit establishing the relative importance of the relativistic electron, energetic proton and x ray contributions to the observed perturbations. In addition to making Schumann resonance measurements, the station in Alaska successfully detected for the first time ALF emissions in the frequency range 6 to 154 Hz generated by polar electrojet modification by the HIPAS HF heater facility located near Fairbanks.
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