[TVARC] Space-X Launch & HF Propagation

[k2te at juno.com]

I saw the following from a post on my old club's website.  Since the
launch is early this evening, it might be interesting to see what happens
with HF propagation.

73 de Ed

The SpaceX Falcon Heavy rocket launch is scheduled for 6:35 PM tonight!
The launch will be broadcast live online via SpaceX’s YouTube channel.

In August 2017, a SpaceX Falcon 9 high altitude rocket, launched from
Vandenberg, generated a gigantic circular Shock Acoustic Wave (SAW) in
the ionosphere covering an area four times greater than California. The
rocket was vertically boosting a lightweight satellite payload to a
mission altitude of about 450 miles (720 km) above the earth. That
altitude is more than most Low Earth Orbit (LEO) satellites, and a team
of scientists tracked the rocket's effects as it poked a hole in the
ionosphere about 5 minutes after launch.

High altitude rocket launches can temporarily affect ionospheric
propagation. They are called anthropogenic space weather events. Such
changes in the ionosphere could affect HF propagation reflection or
perturb GPS positioning accuracy.

Scientists studying the event recorded SAWs emanating outward for 20
minutes, at about 1500 Miles Per Hour (2400 kph) . It was the largest
rocket-induced circular SAW on record, about 900 miles (1500 km) in
diameter. The rocket's exhaust plume also created a large scale
ionospheric plasma hole, which eventually closed back up. Read more about
it on Earth & Space Science News.

From:
https://forums.qrz.com/index.php?threads/rocket-launch-affected-ionospher
e-propagation.609587/
____________________________________________________________
Top Gut Doctor: I Beg Americans To Throw Out This Vegetable
dr-pedre-md.com
http://thirdpartyoffers.juno.com/TGL3141/5cae2c8ce114d2c8c3bc2st04vuc
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/tvarc/attachments/20190410/99e0c799/attachment-0001.html>