Magnetopause
From Glossary of Meteorology
magnetopause
The sharp boundary between the earth's magnetosphere and the solar wind of interplanetary space.
The magnetopause represents the outer termination of the earth's atmosphere and extends from a distance of several earth-radii in the sunward direction to a much larger and rather indefinite distance in the anti-sunward direction, resulting in a cometlike shape with a long tail directed away from the sun.
