heliosphere

[hee-lee-uh-sfeer]
noun Astronomy.
the region around the sun over which the effect of the solar wind extends.

Origin:
1970–75; helio- + -sphere

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Collins
World English Dictionary
heliosphere (ˈhiːlɪəʊˌsfɪə)
 
n
the region around the sun outside of which the sun's influence is negligible and interstellar space begins

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
heliosphere   (hē'lē-ə-sfîr')  Pronunciation Key 
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The sun has a magnetic field, the heliosphere, which envelops our entire solar system.
The heliosphere is a bubble that surrounds our entire solar system and is inflated.
The system travels within a bubble of solar wind-made of charged particles from the sun-called the heliosphere.
Particles streaming from the sun create solar winds, which form a bubble around the solar system dubbed the heliosphere.
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