<< ...in the sun's near field. >>
Not sure I completely agree with that Andy.
If the sun is a single source driving a sun diameter antenna, then yes indeed.
If you consider the sun to be an enormous array of coherent radiaters, then again yes.
However if the sun is considered as an enourmous array of non-coherent, independant small radiators then wouldn't the effective near/Fresnel/far field boundaries would be determined by the geometery of the individual radiator rather than the array geometry?