Other
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.8707r&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Aug. 1, 1987, p. 8707-8722. DFG-supported research.
Other
17
Extremely Low Frequencies, Ionospheric Heating, Magnetic Disturbances, Radio Emission, Very Low Frequencies, Diurnal Variations, Polarization (Waves), Wave Generation
Scientific paper
In October 1981, ELF/VLF waves were produced in the ionosphere in an alternating sequence of approximately 1, 2, 3, and 5 kHz by modulated HF heating of the ionosphere near Tromso, Norway, during a 32-hour period of high geomagnetic disturbance. The apparent source heights, which are derived from the wave phases, show a diurnal variation from about 55 km during the day to about 74 km at night. Other wave parameters such as amplitude, direction, and ellipticity of the ELF polarization ellipse also show a diurnal variation as well as modulation by Pc 5 hydromagnetic waves. The variation of the ELF wave parameters is compared with electric fields measured by the Scandinavian Twin Auroral Radar Experiment (STARE) and with riometer and magnetometer data, in an attempt to understand the factors controlling the ELF wave generation process. Many of the measured wave characteristics are modeled successfully. High electron densities at low altitudes were found necessary to explain the daytime measurements.
Kopka Helmut
Mauelshagen H.-P.
Nielsen Edward
Rietveld Michael T.
Stubbe Peter
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