Physics
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jatp...52..473b&link_type=abstract
(EISCAT Scientific Association, International EISCAT Workshop, 4th, Sigtuna, Sweden, June 5-9, 1989) Journal of Atmospheric and
Physics
5
Eiscat Radar System (Europe), Electron Density Profiles, Very High Frequencies, Electrostatic Waves, Geomagnetism, Gyrofrequency, Incoherent Scatter Radar, Ionospheric Electron Density, Spectrum Analysis, Whistlers
Scientific paper
This paper reports the first successful gyro line experiment with the EISCAT VHF (224 MHz) radar. The incoherent scatter gyro line corresponds to the electrostatic wave mode omega of about Omega cos alpha known to be present in a weakly magnetized plasma (Omega is the electron gyrofrequency and alpha is the angle between the scattering wave vector and the magnetic field). The line is very weak, but has the great advantage from an observational point of view that its position in the scattered spectrum is only marginally dependent on the electron density and temperature. This means that filter offsets can be easily predicted and that a long pulse and long integration times can be used in the experiment. Measurements were made at angles of 55 and 69 deg with the geomagnetic field where the gyro line frequencies are approximately 800 and 500 kHz, respectively. The line was seen in the altitude region 100-200 km, being most intense at 160-170 km. The strong dependence of the gyro line on the magnetic field may be used to study variations in the field.
Bjorna Noralv
Esjeholm B.-T.
Hansen Luise Theil
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