Faraday Rotation: When a linearly polarized radio wave passes through an ionized medium with a magnetic field in the direction of propagation, the plane of polarization rotates. This effect is called Faraday rotation.
Measurement of TEC: Faraday Rotation
n-pi ambiguity:
With considerable number of values of Ti,1 and Tj,2 we can get least sqaure estimates of n1 and n2 .
Ionospheric Tomography
Animation: Ray 1 --1,9 and 14. Ray 2 –3,7,11 and 15. L(1,1)*d(1) + L(1,9)*d(9) + L(1,14)*d(14) = tec(1) L(2,3)*d(2) + L(2,7)*d(7) + L(2,11)*d(11) + L(2,15)*d(15) = tec(2) L(3,4)*d(4) + L(3,7)*d(8) + L(3,12)*d(12) + L(3,15)*d(15) = tec(3) these set of three equations could be clubbed togetherto form a Matrix Equation tec = L * d
To model this rotation, we assumed a standard model of the ionosphere available from http://ccmc.gsfc.nasa.gov/modelweb/models/iri_vitmo.php. The magnetic field values were obtained from http://www.ngdc.noaa.gov/geomagmodels/IGRFWMM.jsp.