With seismic interferometry a virtual source can be created inside a medium, assuming a receiver is present at the position of the virtual source. Here we discuss a method that creates a virtual source inside a medium from reflection data, without needing a receiver inside the medium. Apart from the reflection data, an estimate of the direct arrivals is required. However, no information about t...

This paper distinguishes between two different scales of medium range order, MRO, in non-crystalline SiO(2): (1) the first is ~0.4 to 0.5 nm and is obtained from the position of the first sharp diffraction peak, FSDP, in the X-ray diffraction structure factor, S(Q), and (2) the second is ~1 nm and is calculated from the FSDP full-width-at-half-maximum FWHM. Many-electron calculations yield Si-O...

The differential equation for the fourth-order statistical moment of the field of a plane wave propagating in a two dimensional random medium is solved numerically. Results are presented for the scintillation index when the index-of-refraction correlation function of the medium is Gaussian and gamma (ratio of diffraction length to scattering length) is 50. It is pointed out that the solution ha...