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Hello <br>
<br>
Many thanks for the sighting. I mentioned southern Tasmania auroral
sightings overnight in our daily report.<br>
<a class="moz-txt-link-freetext" href="http://listserver.ips.gov.au/pipermail/ips-sf/2013-May/000573.html">http://listserver.ips.gov.au/pipermail/ips-sf/2013-May/000573.html</a><br>
<br>
The reason for this particular aurora was geomagnetic activity from
a long (~24 hours) period of southward interplanetary (solar)
magnetic field. When that happens the interplanetary field merges
with the Earths geomagnetic field and a lot of solar wind energy is
transmitted down the magnetic field lines into the polar upper
atmosphere. If you had a darker background the aurora may have
looked green (from atomic oxygen energy transitions at ~200km
altitude) but white or no colour is more usual with light
pollution. <br>
<br>
Cheers<br>
IPS duty forecaster<br>
Dave Neudegg<br>
<br>
<br>
<div class="moz-cite-prefix">On 05/02/2013 12:04 AM, Wilkinson/Lynch
wrote:<br>
</div>
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<p class="MsoNormal">Aurora visible in southern skies from
Hobart at approx 23:35 local time. Just appeared as a lighter
area of sky without colour. Local light pollution didn’t help.<o:p></o:p></p>
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