Comment Re:The solar magnetic field is important also (Score 1) 8
The heliosphere is essentially the extent of galactic space in which the sun's magnetic field dominates.
The heliosphere is defined as the region of space where the solar wind dominates over the interstellar medium.
Not sure how different those two definitions are, but they seem different to me.
Also, the Earth's magnetic field dominates over the sun's near the earth, and Jupiter's near Jupiter, etc.