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Gravity Wave, How? Video inside

  1. Sep 21, 2007 #1
  2. jcsd
  3. Sep 21, 2007 #2
  4. Sep 21, 2007 #3
    The clouds are moving in waves. Why?
  5. Sep 21, 2007 #4


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    Why not? This is all atmospheric phenomena, does not have anything to do with gravity waves as the title suggests.
  6. Sep 22, 2007 #5
    Thank you for clarifying that. but why does the clouds move in a wave???
  7. Sep 22, 2007 #6

    Chris Hillman

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    Gravitational waves versus gravity waves

    The popular press--- and unfortunately some physicists--- have taken to calling gravational waves (as in gtr and other gravitation theories) "gravity waves", despite the fact that this term has long been used in meteorology to mean a type of atmospheric wave. I haven't seen the video the OP is asking about, so I have no idea if this video in any sense illustrates a meteorological gravity wave.
  8. Sep 22, 2007 #7
    Since I know this video, allow me to point out and correct couple of things:

    First the video:
    Its misleading (big time). Look at the middle of the screen and you will see a road where a very fast dots are moving (cars). That means its greatly accelerated. Then look at the way the sun moves. It looks as if rising then starts to set however another bright spot migrating across the scene as if it is another day. The time on the screen seem totally irrelevant and misleading. That scene is not taken in 15minutes normal speed. It looks it has been taken very fast over more than a day.

    Second the atmospheric gravity wave business:
    The earth's dynamics is very vast and interesting field. There are numerous waves propagating in various speeds and directions all the time and they may interact non-linearly. The term gravity wave may be well misplaced and should be called topographic wave (since thats the cause of the wave). Needless to say, there are waves in atmosphere caused by gravity tides. There are many other which I will not mention. Let me post a good link concerning topographic waves (which this video to my knowledge portraits): (its actually a masters thesis but in HTML and can be just quickly browsed through looking at the pics to get the idea)
  9. Sep 24, 2007 #8
    Thank you, sneez
    That was very very educational.
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