What is the model for high latitude scattering?
Annex The proposed scattering model • The time scattering model for the available power from the scattered component is given by a half-normal distribution: for where pm is the available received power from specular reflection of the mode Rfactor is (0.2+0.008R12) or 1 whichever is the smaller, and R12 is the sunspot number is the time delay being considered is the time delay of the specular mode Tspread is the standard deviation of the time spread in this half distribution, taken as 1ms where |λd| is the magnetic dip latitude where Tl, is the local time at the control point in hours. • For frequency spreading the scatter is symmetrical around the frequency of the specular component with a similar form of variation as for time spreading: f is the frequency being considered fm is the centre frequency of the specular mode Fspread is the standard deviation of the frequency spread, taken as 3 Hz • The probability of occurrence of scattering on a day within a month, probocc, is given by: wh
