Deterministic retrieval of ionospheric phase screen from amplitude scintillations
Article first published online: 7 DEC 2012
Copyright 1999 by the American Geophysical Union.
Volume 34, Issue 1, pages 229–240, January-February 1999
How to Cite
1999), Deterministic retrieval of ionospheric phase screen from amplitude scintillations, Radio Sci., 34(1), 229–240, doi:10.1029/98RS02351.(
- Issue published online: 7 DEC 2012
- Article first published online: 7 DEC 2012
- Manuscript Accepted: 14 JUL 1998
- Manuscript Received: 24 MAR 1998
In the phase screen theory of ionospheric scintillations the ionospheric irregularities are considered as pure phase objects, and the diffraction pattern produced on the ground, by radio waves propagating through this phase screen, is obtained from conventional Fresnel diffraction theory. In the present paper the inverse problem of retrieving phase variations in the screen from the diffraction pattern on the ground is treated by using the transport-of-intensity equation (TIE), which is derived from the Fresnel diffraction theory result. An approximate version of the TIE is solved to obtain the phase variation in the screen from the intensity distribution on the ground. It is seen that when the phase variations involve spatial scale lengths ∼400 m, phase fluctuations of ∼5 rad can be recovered from intensity variations on the ground, for a 300-MHz signal. For larger spatial scale lengths and higher frequencies this method can be used to retrieve larger phase variations in the screen.