What is aurora?

polar lights or aurora are bright bands of light that streak in the sky of the polar regions. the sun emits high-energy on particles., also known as solar wind , get deflected by the earths magnetic field , As a result they are drawn magnetically sown into the ionosphere above the Earths surface at the poles, their collision with the gas particles of the air causes the impressive display of colour in the northern sky.
the magnetic field of the earth protects us from the solar wind, which would otherwise destroy all life on the earth.
the luminosity of polar lights depends on the solar wind i,e,events, such s gas eruptions, on the sun.