Hi
Many of us would be aware of the Perlan project started by Steve Fosset
before his untimely death, which aims to soar to 90,000ft using
stratosphereic mountain waves and the polar vortex (see
http://www.perlanproject.com/)
NASA recently captured a glimpse of (north) polar stratospheric clouds
at around 100,000ft - see
http://earthobservatory.nasa.gov/IOTD/view.php?id=49187&src=eoa-iotd
Apart from the incredible thought of soaring a glider to the edge of
space, this particular instance is interesting as the Perlan project has
previously concentrated on the southern polar vortex and the waves
generated there. It's clear this effect also occurs in the northern
hemisphere - I don't know if stratospheric waves are more common in the
southern vortex than the northern one...I am still looking for data on this.
--
Robert Hart [email protected]
+61 (0)438 385 533 http://www.hart.wattle.id.au
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