Abstract
The morphology of the auroral and subauroral ionosphere is strongly dependent on the interplanetary magnetic field and the level of geomagnetic activity. This change in the morphology impacts on the characteristics of signals received after propagation through these regions of the ionosphere. In order to develop a better understanding of these effects, a number of experiments have recently been undertaken in which the time of flight, Doppler frequency, and direction of arrival of HF signals have been measured over several northerly paths. In this paper, parameters derived from the observations of the channel scattering functions and direction of arrival for HF signals propagating over two paths (one in the auroral zone, and one at latitudes affected by the midlatitude trough) are presented.
Highlights
[1] The morphology of the auroral and subauroral ionosphere is strongly dependent on the interplanetary magnetic field and the level of geomagnetic activity
In order to develop a better understanding of these effects, a number of experiments have recently been undertaken by the University of Leicester in which the time of flight, Doppler frequency, and direction of arrival of HF signals have been measured over several northerly paths
[18] Observations of azimuth and delay have been presented for HF signals propagating over two paths: RS4005 one in the region of the night time midlatitude trough (Uppsala – Leicester) and the other in the auroral zone (Kirkenes – Kiruna)
Summary
[1] The morphology of the auroral and subauroral ionosphere is strongly dependent on the interplanetary magnetic field and the level of geomagnetic activity. [4] Measurements made over two paths (Figure 1 shows their position relative to the modeled position of the midlatitude ionospheric trough [Halcrow and Nisbet, 1977] for a time of 0200 UT with Kp values of 0 and 6) on frequencies in the range 4 – 20 MHz are presented in this paper: (a) a 1400 km link along the midlatitude trough with the transmitter located in Uppsala, Sweden and the receiver in Leicester, U.K., and (b) a 450 km link located predominantly in auroral zone between Kirkenes, Norway and Kiruna, Sweden.
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