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Ann. Geophys., 20, 1479-1486, 2002
www.ann-geophys.net/20/1479/2002/
© European Geosciences Union 2002
Doppler shift simulation of scattered HF signals during the Tromsø HF pumping experiment on 16 February 1996
T. D. Borisova1, N. F. Blagoveshchenska1, I. V. Moskvin1, M. T. Rietveld2, M. J. Kosch3, and B. Thidé4
1Arctic and Antarctic Research Institute, 38, Bering Str., St. Petersburg, 19 9397, Russia
2Max-Plank-Institut für Aeronomie, D-37191, Katlenburg-Lindau, Germany
3Dept. Communication Systems, Lancaster University, LA1 4YR, Lancaster, UK
4Swedish Institute of Space Physics, Uppsala Division, Box 537, SE 75 121 Uppsala, Sweden
Correspondence to: N. F. Blagoveshchenskaya
(nataly@aari.nw.ru)
Abstract. Comparisons between
bistatic scatter measurements and simulation results during the Tromsø HF
pumping experiment on 16 February 1996 are made. Doppler measurements of an HF
diagnostic signal scattered from the field-aligned irregularities (FAIs) in the
auroral E-region were carried out on the London – Tromsø – St. Petersburg
path at 9410 kHz from 21:00 to 22:00 UT. The scattered signals were observed
both from natural and artificial ionospheric irregularities located in the
vicinity of Tromsø. To simulate the Doppler frequency shifts, fd
, of scattered signals, a radio channel model, named CONE, was developed.
The model allows for ray tracing, group and phase paths, and Doppler frequency
shift calculations. The calculated Doppler shifts were analyzed for dependence
on the magnitude and direction of plasma velocities in the scattering volume.
It was found that the velocity components in the north-south direction are
crucial for explaining the Doppler frequency shifts of the scattered diagnostic
signals. To simulate fd , real velocities obtained from the
EISCAT UHF radar at an altitude of 278 km and from the digital all-sky imager
during the experiment were employed. The simulation results of Doppler
frequency shift variations with time are in reasonable agreement with the
experimental Doppler shifts of scattered signals on the London – Tromsø –
St. Petersburg path.
Key words. Ionosphere (active
experiments; ionospheric irregularities) Radio science (ionospheric
propagation)
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