magnetopause
noun
mag·ne·to·pause mag-ˈnē-tə-ˌpȯz 
-ˈne-
: the outer boundary of a magnetosphere
Example Sentences
Recent Examples on the Web On June 24, Juno crossed Jupiter's bow shock, and the next day, Juno crossed the magnetopause. 
Avery Thompson, Popular Mechanics, 1 July 2016 The bow shock is like Jupiter's sonic boom, while the magnetopause is the physical boundary between the Sun's magnetic field and Jupiter's magnetic field. Avery Thompson, Popular Mechanics, 1 July 2016 Listen to the sounds of Juno entering Jupiter's space:In the video, Juno crosses two thresholds: the bow shock and the magnetopause. Avery Thompson, Popular Mechanics, 1 July 2016
Avery Thompson, Popular Mechanics, 1 July 2016 The bow shock is like Jupiter's sonic boom, while the magnetopause is the physical boundary between the Sun's magnetic field and Jupiter's magnetic field. Avery Thompson, Popular Mechanics, 1 July 2016 Listen to the sounds of Juno entering Jupiter's space:In the video, Juno crosses two thresholds: the bow shock and the magnetopause. Avery Thompson, Popular Mechanics, 1 July 2016 Word History
First Known Use
1962, in the meaning defined above