Photo of the Day: ‘April Aurora ’ by David Porter.
Aurora activity again in the north of Ireland (Co.Donegal) during April , members of the Buncrana Camera Club were out in force to capture this spectacular event , rarely seen this far south . Auroras result from emissions of photons in the Earth’s upper atmosphere, above 80 km (50 mi), from ionized nitrogen atoms regaining an electron, and oxygen and nitrogen atoms returning from an excited state to ground state. They are ionized or excited by the collision of solar wind and magnetospheric particles being funneled down and accelerated along the Earth’s magnetic field lines; excitation energy is lost by the emission of a photon, or by collision with another atom or molecule… !
This photo is available to buy from only €25 at http://www.lokofoto.com/photos/1993