Heliosphere
[hee-lee-uh-sfeer] /ˈhi li əˌsfɪər/
noun, Astronomy.
1.
the region around the sun over which the effect of the solar wind extends.
/ˈhiːlɪəʊˌsfɪə/
noun
1.
the region around the sun outside of which the sun’s influence is negligible and interstellar space begins
heliosphere
(hē’lē-ə-sfîr’)
The large, roughly elliptical region of space around the Sun through which the solar wind extends and through which the Sun exerts a magnetic influence. The heliosphere extends well beyond the orbits of the planets, and its shape and extent fluctuate with changes to the solar wind and other influences. ◇ The boundary between the heliosphere and interstellar space is known as the heliopause.
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