Definition of "heliosheath" [heliosheath]

• A zone between the termination shock and the heliopause, in the heliosphere, at the outer border of the Solar System, where the solar wind is dramatically slower than within the termination shock. (noun)

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• "The heliosheath is the final area of the solar system where the sun's wind blows:"
• "The new data suggests, however, that the interstellar magnetic field slips around the heliosphere and the outer shell, called the heliosheath, leaving the spherical shape of the heliosphere intact."
• "Both spacecraft are now in a region known as the "heliosheath", the outermost layer of the Solar System, where the solar wind, which can travel 16 miles per second, is being slowed down by the rising pressure of interstellar gas."