Alternate Definitions for Magnetotail

Earth's magnetotail drags out behind it, shaped by the flow of the solar wind on the night side of Earth. It extends over a hundred thousand miles and can collect much incoming energy from the sun, before releasing it toward Earth or further down the tail.

The region on the night side of the bodywhere the magnetic filed is stretched backwards by the force of the solarwind. For Earth, the magnetotail begins at a night-side radial distance of10 Re (X > -10Re).