the.com/magnetopause
the border where earth's magnetic bouncer stops the sun's wind from crashing the party.
means it's the boundary in space where a planet's magnetic field pressure balances the solar wind's pressure, marking the outer edge of its magnetosphere.
from coined mid-20th century from magneto- (magnetic field) plus -pause, the same suffix used in tropopause and stratopause, borrowed from greek pausis meaning stopping point.
average distanceabout 10 earth radii on the sunward side
shapesquashed on day side, stretched into a long tail at night
it movessolar storms can push it closer, even inside satellite orbits
not solidit is a shifting pressure balance, not a physical wall