Striation

Striations or streaks which are observed to form whirls in the Solar chromosphere.
Fictitious Mean Sun ...

The larger bands are roughly 20 km (12 miles) across commonly with dark diffuse outer edges, regular striations, and a central band of lighter material.

At the northern high-latitude edge of the image, additional striations are visible, caused by particulates that are high enough to be illuminated by the Sun even though the surface directly below is in darkness.

This was based on observations of periodic variations in light and dark patches, particularly in the polar latitudes, which looked like seas and continents, while long, dark striations were interpreted by some observers as irrigation channels for ...

The curtains often show folds called "striations", which are curtain-like.

NEWMAN LINES - Fine striations seen in some high-Ni iron meteorites.
NEWTON’S LAW OF GRAVITATION - Two bodies, with masses m1 and m2, separated by distance, r, have a mutual force of attraction, F, of: ...

chemistry, and physical properties of minerals, including their creation and destruction. Geologists look at certain features of minerals known as cleavage, colour, crystal shape, fracture, hardness, specific gravity, streak, and striations.

Jupiter's surface shows pronounced horizontal striations: the light layers (zones) are at a slightly higher altitude and about 15° cooler than the dark layers (belts). Atmosphere primarily H2 (85%) and He (14%), with traces of methane, ammonia, etc.

riblets (NASA Thesaurus) Longitudinal striations forming V-shaped grooves on aerodynamic and hydrodynamic surfaces. The riblet devices act to reduce large-scale disturbances near the boundary layer.

See also: Time, Earth, Mass, Light, Atmosphere