Other labeled parts of the heliosphere are its outer edge (heliopause), the point at which the solar wind slows in speed (termination shock) and the region between those two boundaries (heliosheath). (sciencenews.org)
Part of the problem is that we do not know exactly where the boundary of the solar system is — only that it is marked by the edge of a magnetic bubble known as the heliopause, at which the influence of other stars starts to dominate that of the sun. (newscientist.com)
Finally it showed that our solar system is larger than previously thought: when the mission ended, with the probe 6.2 billion miles from Earth, it was still detecting solar - wind particles, indicating that it had not yet crossed the heliopause — the boundary between the solar system and interstellar space. (discovermagazine.com)