Here some interesting paper about LF MF polarization http://www.ann-geophys.net/22/1705/2004/angeo-22-1705-2004.pdf
This paper, High-latitude propagation studies using a meridional chain of LF/MF/HF receivers >> Fig. 5. (a) Polarization of 50-5000 kHz signals recorded at Churchill, Manitoba, on 1-2 October 1997. White pixels indicate left-hand polarization, black pixels indicate right-hand polarization, and gray pixels indicate indeterminant polarization. (b) Power spectral density of the same 50-5000 kHz signals. Received signals above 1MHz are predominantly left-hand polarized except in the interval 09:00-12:00UT, 1-4 h before sunrise, when righthand waves dominate at frequencies above about 3Mhz. >> Figure 5 shows a possibly related effect occuring near the dawn terminator but involving wave polarization. The bottom panel shows a spectrogram of 50-5000 kHz signals recorded at Churchill, Manitoba, for 20 h, starting at 20:00 UT on 1 October 1997, a geomagnetically quiet day for which the signals show the usual diurnal pattern. >> 7'3 N4IS JC _______________________________________________ Topband reflector - [email protected]
