2014 Southern Lights Medallion & Stamp Cover PNC

2014 Southern Lights 2 Limited Edition Medallion CoverThe Southern Lights (Aurora Australis) are the counterpart of the Northern Lights (Aurora Borealis). Auroras most commonly occur above a band of high latitudes in each hemisphere, known as the auroral zones.The Southern Light are less commonly seen than their northern counterpart, as there are comparatively few populated regions under the auroral zone of the Southern Hemisphere.The two main discernible forms of aurora are a diffuse glow, which generally appears towards the poleward horizon, and discrete forms such as arcs and curtains that stretch from east to west, as well as rays that may run upward from the horizon.These forms are shaped by the Earth’s magnetic field.These colour depend on energy of the incoming solar particles, and the type of atmospheric gasses they interact with.The Southern Lights are best seen from the Islands of the Southern Ocean and Antarctica in Australia, they are occasionally observed in the southern skies of Tasmania and sometimes from southern locales on the mainland.Housed in a full colour envelope this two medallion cover features two Australia Post $1.40 commemorative stamps.Postmarked first day of issue.Denomination :         MedallionQuality :                   Antique FinishMetal :                     CopperWeight :                   25 gmsDiameter :                37 mmMintage :                  3,500Certificate of Authenticity : Australia Post Seal of AuthenticityAdvertising Date :      1st July 2014Release Date :           26th August 2014