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© Thomas Bojer Eltorpbut

Green auroras over Greenland? It must be St. Patrick's Day. The celebration began last night with this display over Nuuk.

"They were not the most powerful auroras," says photographer Thomas Bojer Eltorpbut, "but it was such a beautiful display." He took the picture by opening the shutter of his Nikon D3 for 90 seconds at ISO 1600.

More green is in the offing. A solar wind stream is heading for Earth, and it could spark even stronger geomagnetic activity when arrives on or about March 20th. Arctic sky watchers should be alert for auroras on the first night of Spring.