Heliopause - Heliopause
Heliopause (14) Add new question
Question
Q: what do you know about Heliopause ?
| Option | Answer | Is Correct |
|---|---|---|
| 1 | The heliosphere is divided into two separate regions. The solar wind travels at its maximum velocity out to about 95 AU, or three times the orbit of Pluto. The edge of this region is the termination shock, the point at which the solar wind collides with the opposing winds of the interstellar medium. Here the wind slows, condenses and becomes more turbulent, forming a great Oval structure known as the heliosheath that looks and behaves very much like a comet’s tail, extending outward for a further 40 AU at its stellar-windward side, but tailing many times that distance in the opposite direction. The outer boundary of the heliosphere, the heliopause, is the point at which the solar wind finally terminates, and the beginning of interstellar space. The shape and form of the outer edge of the heliosphere is likely affected by the fluid dynamics of interactions with the interstellar medium. Beyond the heliopause, at around 230 AU, lies the bow shock, a plasma ‘wake’ left by the Sun as it travels through the Milky Way. No spacecraft have yet passed beyond the heliopause, so it is impossible to know for certain the conditions in local interstellar space. How well the heliosphere shields the Solar System from cosmic rays is poorly understood. A dedicated mission beyond the heliosphere has been suggested. |
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