The short term propagation effects caused by local weather changes are called as ______________(a) Seasonal(b) Temporal(c) Diurnal(d) NoiseI had been asked this question in an interview.I would like to ask this question from Hyperbolic Radio Systems in section Terrestrial Radio Navigation System of Avionics

The short term propagation effects caused by local weather changes are

1.	The short term propagation effects caused by local weather changes are called as ______________(a) Seasonal(b) Temporal(c) Diurnal(d) NoiseI had been asked this question in an interview.I would like to ask this question from Hyperbolic Radio Systems in section Terrestrial Radio Navigation System of Avionics
Answer» The CORRECT OPTION is (c) Diurnal Explanation: The diurnal variations are short term propagation EFFECTS caused primarily by local weather changes and day/night transitions along the signal PATH. Variations in a refractive index of the ATMOSPHERE versus height from the ground contribute to the short term propagation errors.

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