Street sign – Bugeron Effect

From Greg.Org:

The photo above of a 2001 space shuttle launch at sunset shows part of
the exhaust plume in the earth’s shadow, and part of it illuminated by
the sun. Apparently, the shadow of the plume itself, which only appears
to connect with the moon, is called the Bugeron Effect, [or Burgeron Effect?] which is apparently different from the Bergeron Effect . So that’s like three or four things I didn’t know, and one I still don’t. here’s a normal picture of the earth shadow rise. [via nasaimages.org]