[Ips-aurora-sightings] aurora Hobart Tas

[anonymous]

Hello

Many thanks for the sighting. I mentioned southern Tasmania auroral 
sightings overnight in our daily report.
http://listserver.ips.gov.au/pipermail/ips-sf/2013-May/000573.html

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.

Cheers
IPS duty forecaster
Dave Neudegg


On 05/02/2013 12:04 AM, Wilkinson/Lynch wrote:
>
> 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.
>
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