You searched for: “heliosphere
1. The region of space where solar and planetary particles and magnetic fields are dominant.
2. A spherical region around the sun, approximately 100 astronomical units in radius, outside which interstellar space begins.
3. The region of space through which the solar wind extends and the region around the sun outside of which the sun's influence is negligible and interstellar space begins.
This entry is located in the following units: helio-, heli- (page 4) sphero-, spher-, -sphere- (page 8)