magnetosheathn.
/maɡˈniːtə(ʊ)ˌʃiːθ/, U.S. /mæɡˈˌnɛdəˌʃiθ/, /mæɡˈˌnidəˌʃiθ/ Astronomy.
The turbulent region between the shock wave and the magnetopause of a planetary body moving through the solar wind.
ΚΠ
1967 Rep. European Space Res. Inst. Sept. 22 (title) Oscillations of the magnetosheath.
1975 Nature 15 May 206/1 Observations..made at the first encounter of Mariner 10 with Mercury (Mercury I) unexpectedly showed the presence of a strong bow shock wave, enclosing a magnetosheath.
1984 L. R. Lyons & D. J. Williams Quantitative Aspects Magnetospheric Physics i. 2 At the bow shock the solar wind becomes thermalized and subsonic and continues its flow around the magnetosphere as magnetosheath plasma, ultimately rejoining the undisturbed solar wind.
1995 Sci. Amer. Dec. 33/3 A shock wave forms at the upstream, or sunward, edge of the magnetosphere; downstream, the magnetic field is elongated to form a so-called magnetotail.
This is a new entry (OED Third Edition, March 2000; most recently modified version published online March 2022).
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n.1967