Alternate Definitions for Wilson effect

include archived terms
Term: Wilson effect
Definition:

A phenomenon in which the shape of sunspots flattens as they approach the Sun's limb due to the solar rotation. More specifically, when a sunspot approaches the solar limbs the width of the penumbra, relative to the umbra, on the side facing the center of the Sun seems to become narrower than on the side facing the limb. This phenomenon arises from a projection effect, and is due to a geometrical depression (the Wilson depression) in the layers of constant optical depth in sunspots.

Created 2023.04.16
Last Modified 2023.04.16
Contributed by Ryan McGranaghan
Permalink:
https://n2t.net/ark:/99152/h24920
Term: Wilson effect
Definition:

A phenomenon in which the shape of sunspots flattens as they approach the Sun's limb due to the solar rotation. More specifically, when a sunspot approaches the solar limbs the width of the penumbra, relative to the umbra, on the side facing the center of the Sun seems to become narrower than on the side facing the limb. This phenomenon arises from a projection effect, and is due to a geometrical depression (the Wilson depression) in the layers of constant optical depth in sunspots.

Created 2023.04.16
Last Modified 2023.04.16
Contributed by Ryan McGranaghan
Permalink:
https://n2t.net/ark:/99152/h25033