411 REFERENCE · Wiktionary
Evershed effect
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Etymology
Named after British astronomer John Evershed.
Noun
The radial flow of gas across the photospheric surface of the penumbra of sunspots from the inner border with the umbra towards the outer edge.
Further reading
en eponyms
en Spectroscopy