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Hello Arthur<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. So it was low on the horizon as it was located towards
Antarctica. The green colour is from atomic oxygen energy
transitions at ~200km altitude. The pink/red at the bottom is from
higher energy particles getting down to about 110km altitude and
causing energy transitions in other molecules like NO. <br>
<br>
<br>
Cheers<br>
IPS duty forecaster<br>
Dave Neudegg<br>
<br>
<br>
<div class="moz-cite-prefix">On 05/02/2013 08:47 AM, Arthur Sale
wrote:<br>
</div>
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<p class="MsoNormal"><span style="font-size:12.0pt">I believe my
wife and I saw an aurora low in the sky today 1 May 2013 at
about 04:30 Australian Eastern Standard Time, roughly SSW.
It was a green glow about 5-10° above the horizon, with pink
tinges low down. The sky was clear of cloud, and we could
see the Southern Cross and the Milky Way. The air was still;
and Mt Wellington had frost/snow on it this morning.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Arthur Sale<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Howrah,
Tasmania <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">42.90038°S,
147.4138°E<o:p></o:p></span></p>
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<br>
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