Other
Scientific paper
Aug 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988angeo...6..381r&link_type=abstract
Annales Geophysicae (ISSN 0980-8752), vol. 6, Aug. 1988, p. 381-388. DFG-supported research.
Other
5
Atmospheric Electricity, D Region, Geomagnetic Micropulsations, Ionospheric Heating, Extremely Low Radio Frequencies, Incoherent Scatter Radar, Magnetometers, Radio Frequency Heating
Scientific paper
During an extended ionospheric heating experiment near Tromso, Norway on September 20, 1985, ELF waves of 1425 Hz were generated in the ionospheric D-region and the horizontal wave-field was recorded on the ground with high temporal resolution. A half-hour interval near noon shows amplitude and phase oscillations of about 3-sec period which are associated with a Pc 1 geomagnetic pulsation recorded simultaneously on the ground at several Scandinavian stations. These data are interpreted as representing ionospheric electric field pulsations in a region of about 16 km diameter with amplitudes in the range 4-12 mV/m. The electric pulsation polarization ellipse was found to be predominantly left-hand polarized, ranging from circular to linear with rare intervals of right-hand polarization. These observations show the potential of using heating-induced ELF waves for examining ionospheric electric fields from dc up to at least Pc 1 frequencies, which cannot be readily measured by other ground-based techniques.
Kopka Helmut
Rietveld Michael T.
Stubbe Peter
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