Aurora borealis

An Aurora or polar lights or northern lights is a naturallight display in the Earth's sky.

Auroras are produced when the magnetosphere is sufficiently disturbed by the solar wind that the trajectories of charged particles in both solar wind and magnetospheric plasma, mainly in the form of electrons and protons, precipitate them into the upper atmosphere due to Earth's magnetic field, where their energy is lost.

In northern latitudes, the effect is known as the aurora borealis or the northern lights.

Usually Aurora is seen in the spring and autumn, and the best time — vernal equinox and autumnal equinox.