Magnetohydrodynamic effects on the sun's magnetic field create this type of structure named for Parker. Horizontal wind sets the surface layer into motion, causing one of these structures to form in the ocean, in a form of them named for Ekman. A diagram of the parametric point of the Fresnel functions takes the form of this structure; that diagram is named for Cornu. The Tully-Fisher relation is 
Magnetohydrodynamic effects on the sun's magnetic field create this type of structure named for Parker. Horizontal wind sets the surface layer into motion, causing one of these structures to form in the ocean, in a form of them named for Ekman. A diagram of the parametric point of the Fresnel functions takes the form of this structure; that diagram is named for Cornu. The Tully-Fisher relation is the relationship between the stellar mass and intrinsic luminosity of galaxies that take this shape. For 10 points, name these structures, exemplified by galaxies like Andromeda that aren't elliptical but can be barred.
Magnetohydrodynamic effects on the sun's magnetic field create this type of structure named for Parker.
{spirals}