Figure 3: This is a diagram that shows the different parts of the heliosphere. As the Sun moves through the interstellar medium, the material around it is 'pushed' out of the way by the solar wind, which forms the heliosphere. Each part of the heliosphere has a different name, as indicated on the diagram: the bow shock, heliopause, heliosheath, termination shock, and the heliotail. (Courtesy: NASA-IBEX).
This image appears in the Technology Through Time article, #62: "Where is the heliopause?".
The August 4, 1972 solar flare was so powerful that, by some estimates, a spacesuited astronaut would have received a lethal does of radiation.