reply to post by spacebot
Precisely correct. Gravity waves occur in any fluid, and the atmosphere is a fluid, albeit a gaseous fluid.
Edit: Additional clarification.
However, the gravity waves referred to in the link you posted are standing gravity waves and not generic gravity waves which may or may not be
dispersive (resulting in a different dynamic). To be sure, it should be stated that lenticular clouds and "wave clouds" are, in fact, examples of
standing waves as is the wave cloud train shown in the OPs linked image.
I should have perhaps been more clear on this - namely that lenticular clouds and "wave clouds" (sometimes "wave clouds" and "wake clouds" are
used interchangeably - although they do look differently and to use a term such as "Kelvin Wake" clouds is, I believe, misleading - more on that
later) are all manifestations of gravity waves; however, these are both special types of gravity waves (actually - the lenticular clouds and "wave
clouds" are one and the same - a single stationary gravity wave-induced cloud is called a lenticular cloud, while we commonly refer to a string of
them as a "wave cloud"). In simple terms, this means that the waves are stationary (or appear so). This is why a lenticular cloud will hover over a
mountain peak for a very long time indeed. In fact, if we had a series of images my guess is that we would see the "wave clouds" standing still
while the von Karman vortices would be spiraling out from the island(s).
Also - given a longer glance at the OPs photo, there is actually a lot going on in there - at least three distinct types of wave phenomenon, possibly
more. This is no surprise and not in and of itself odd, but it is very interesting from a meteorological perspective.
As far as the connection between cloud formation and electromagnetics - yes; but not in the case of gravity clouds of any of these types. These are
all simply manifestations of gravity and buoyancy (essentially). So that (in my opinion) is a dead end road for this topic. However, there is much
to be said about EM and tornados, thunderstorms, strange lightning effects (sprites, etc.) and possibly hurricanes. I am one who looks at a lot of
raw satellite imagery and thus am quite used to seeing these phenomenon and some things that I believe defy traditional explanation.
As an aside, there are also gravity waves which are non-stationary - one such great example is in this video from YouTube:
www.youtube.com...
(Sorry - Haven't figured out how to post YouTube clips yet...)
Finally, I would be remiss if I did not mention that the original thread in which the OPs photo was first discussed:
www.abovetopsecret.com...
I emphatically disagree with the assessment that these waves are "Atmospheric Kelvin
Wakes" as claimed by eaglewingz (although he/she
simply took that description from the link www.lpi.usra.edu... so no responsibility is levied upon that poster). Atmospheric Kelvin
Waves do indeed exist, but they are another beast entirely.
(Edit: Clarity with types of gravity waves.)
[edit on 29-4-2008 by WoodyAcres]
[edit on 29-4-2008 by WoodyAcres]