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Sunday, March 22, 2015

 

Aurora Watch and Geomagnetic Alert (22-23 March)

After 2 nights of aurora (with some activity seen by die-hard observers on the 19th) we have yet another Aurora Watch issued by the Australian IPS for the  22nd (yes tonight) and the 23rd due to increased solar wind speed from a Coronal Hole. Geomagnetic activity is rate at only "unsettled to active" rather than storm levels, and aurora, if they occur, are likely to be seen only in Tasmania.

Aurora can occur at any time after nightfall (although around midnight or just after seems to be common). Dark sky sites have the best chance of seeing anything, and always allow around 5 minutes for your eyes to become dark adapted.

As always look to the south for shifting red/green glows, beams have been reported too. In the last display proton arcs were seen to the west of the main display.

The all sky aurora camera in Southern Tasmania at Cressy may be helpful),
http://www.ips.gov.au/Geophysical/4/2
SUBJ: IPS AURORA WATCH
ISSUED AT 2305 UT ON 21 Mar 2015 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE

Geomagnetic activity could result in auroras visible from Tasmania
during local nighttime hours 22-23 Mar. Aurora alerts will follow
should favourable space weather activity eventuate.

Due to elevated solar wind speed and increased IMF magnitude,
there is the possibility of minor storm periods 22-23 Mar if
IMF Bz turns southward.

INCREASED GEOMAGNETIC ACTIVITY EXPECTED
DUE TO CORONAL HOLE HIGH SPEED WIND STREAM
FROM 22-23 MARCH 2015
 GEOMAGNETIC ACTIVITY FORECAST
22 Mar:  Unsettled to Active
23 Mar:  Unsettled to Active

http://www.ips.gov.au

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