Forward scatter

It almost always occurs when the wavelength of the radiation used is small relative to the features which lead to the scattering.

In many cases the waves of interest have relatively small wavelengths, for instance high-energy electrons[1] or X-rays.

[3] However, the process is very general and can also be seen when water flows through a narrow channel as shown in the figure at the Blue Lagoon.

[4] Comets studied forward-scattering in visible-thermal photometry include C/1927 X1 (Skjellerup–Maristany), C/1975 V1 (West), and C/1980 Y1 (Bradfield).

[5] Comets studied forward-scattering in SOHO non-thermal C3 coronograph photometry include 96P/Machholz and C/2004 F4 (Bradfield).

Saturn eclipses the Sun, as seen from the Cassini space probe . The forward scattering of light makes the faint outer rings more visible.
Forward scattering of a photon, with possible energy change.
Wave diffraction at the Blue Lagoon, Abereiddy