Re: Re:HRPT image, mysterious trails

Further to that, David. I have managed to get a 6 hour animation of that
region, and can now see that your supposition about gravity waves is
correct. The waves are coherent over the period appx 15z to 23z, and are
propagating northwards for most part, but the eastern end seems to be moving
westwards. The source seems to be deep convection near the equator. The
waves are propagating against the flow/cloud movement.The line is becoming
more curved with time. Other, thicker, bands can be seen moving north nearer
the equator, but these appear to be enhancing the cloud locally, unlike the
dark bands in the original image. The more I look at the animation, the more
it appears to be seething with waves modulating the boundary layer cloud.

--
Bernard Burton
Wokingham, Berkshire, UK.

Satellite images at:
www.btinternet.com/~wokingham.weather/wwp.html
"Bernard Burton" <b.j.burton-nospam-@xxxxxxxxxxxxxx> wrote in message
news:48tqujFlsmvfU1@xxxxxxxxxxxxxxxxx
Thanks David.
I am not convinced that these are gravty waves. What we can see from the
image is that they are definately warmer than the boundary layer clouds in
that area, so they may be gaps in the clouds, which would lend credence to
a
wave type phenomenon.
But if you observe the extreme eastern end of the linear 'trails'. there
is
a region where nearby trails bend and cross, which would rule out any
gravity waves I can visualise. However, there could perhaps be some
interaction with the disturbed flow around the island upwind, producing
the
chaotic orientation of the trails at their eastern end. And then there is
the problem of a triggering mechanism. Gravity waves are normally
generated
by a density discontinuity, as may occur at a land-sea boundary, or by
downdraughts associated with deep convection, or by interaction between
deep
convection and the tropopause. If these are gravity waves, they are a long
way from any likely trigger. I am still not convinced that these are
gravity
waves. There may be another pass over that area at 2340z, but it will have
to wait till the morning before I get a look at it.


--
Bernard Burton
Wokingham, Berkshire, UK.

Satellite images at:
www.btinternet.com/~wokingham.weather/wwp.html
"waghorn" <invalid@xxxxxxxxxxx> wrote in message
news:c952417f952a4ea6aa3f8a8338d24cf1@xxxxxxxxxxxxx
You have got sharp eyes Bernard.
My immediate reaction is that this is an 'atmospheric solitary wave'or
'Morning Glory' like bore and wave train cf-
http://www.atmos.umd.edu/~pinker/remote_sensing_meso.html
and image and discussion in
http://envisat.esa.
int/workshops/meris_aatsr2005//participants/43/pres_daSilva.pdf
this wld fit as the waves look to be at low level in the stable boundary
layer (acting as a wave guide),
Regards'
David




.

Relevant Pages

  • Ligo, Ligo..
    ... "Observatory Tries to Catch a Gravitational Wave ... aims to find gravitational waves, possible clues to the universe's dark ... of the LIGO laboratory in the high desert of southeastern Washington. ... in the race to measure the first gravity waves are essentially giving ...
    (soc.culture.baltics)
  • Re: Gravity Wave Tech
    ... in empty space, remotely from a generator ... Except - these are high frequency gravity waves. ... influence would probably be on communications, since you could beam ...
    (rec.arts.sf.science)
  • Re: Solar activity and Earths atmosphere
    ... causing extra heating which sends gravity waves equatorward. ... Ocean waves and tsunamis are examples of gravity waves. ... package of particles that are already here, ...
    (uk.sci.weather)
  • Re: Glaciers and stunami
    ... Long waves propagate in a fluid medium (that includes ... the ocean it will generate gravity waves, but obviously, they won't be ... "Any disturbance of the water surface can in prinicple generate ... tsunami as used by scientists is somewhat broader than you thought. ...
    (sci.geo.geology)
  • Re: GPS CLOCK PARADOX
    ... My animation shows waves that have the same frequency in the source ... That is *not* what you animation shows. ... source with a moving detector .. ...
    (sci.physics.relativity)