Physics
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...100.7791b&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 100, no. A5, p. 7791-7806
Physics
3
Atmospheric Physics, Earth Ionosphere, Electric Fields, Electric Pulses, Extremely Low Frequencies, Stratosphere, Balloon-Borne Instruments, Narrowband, Power Spectra, Radio Emission, Southern Hemisphere
Scientific paper
A survey has been performed of the power spectra of the electric field measured by stratospheric ballon-borne instruments during the 1985-1986 South Pole Balloon Campaign. The survey reviewed all 468 hours available data and covered the frequency range from 0 to 4 Hz. Three episodes of narrow-band emissions were detected in this frequency range. These emissions occurred about 5.5% of the time, with intense emission occuring about 1% of the time. These narrow-band emissions had frequencies in the horizontal component between 2 and 2.5 Hz. The frequencies observed in the vertical component were different, with several bands present. The fundamental frequency in the vertical component was around 0.8 to 1.4 Hz depending on event. The spectra of the events in the vertical component showed multiple emission bands, not all harmonically spaced. The vertical component showed much more pronounced time variations of the frequencies of the emission bands than the horizontal component showed. The amplitude of the emission in the vertical component was usually but not always larger than that in the horizontal components. The ration E(sub V)/E(sub H) was typically approximately 2-3. The amplitude of the horizontal component of the emissions was quite large in one of the three events, with individual bursts having amplitudes of 60 mV/m. The polarization was complicated. In the horizontal plane, there were two narrow bands of opposite-handed circularly polarized emissions. Since the vertical axis of the emission had frequency components not present in the horizontal plane, the polarization in the zonal plane was linear, with a quasi-Lissajou character. An extensive list of possible explanations for these emissions was considered. Distant sources associated with tropospheric storms were considered in detail. During the most intense of the 2-Hz emission events, the nearest bad weather was more than 1000 km away.
Benbrook James R.
Bering Edgar A.
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