Polarisation effects for tweek propagation

Details Polarisation effects for tweek propagation Polarisation effects for tweek propagation

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jastp..60..461s&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 60, Issue 4, p. 461-469.

Physics

11

Scientific paper

Three field component measurements of night-time ``tweek'' atmospherics had been performed in both northern and southern hemispheres. Multimode analysis of the frequency-time structure of tweeks allowed us to detail the polarisation features of these signals. Effects induced by the oblique Earth's magnetic field are observed in tweeks: the polarisation non-reciprocity for the propagation from East to West and from West to East, and the left-handed polarisation of the tweek tail. The sense of rotation of the horizontal magnetic field vector of tweeks is opposite in the two hemispheres following the direction of the vertical component of the geomagnetic field. Variations of the polarisation sign are observed at the transitional part (between the head and tail of tweeks). The electron density (28 cm-3 at 88 km altitude) and the steepness of electron density profile in the lower ionosphere have been estimated using the records of tweeks.

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