Bow Shock Theory For Earth's Sun
It was hypothesised that the Sun also has a bow shock as it travels through the interstellar medium. This will occur if the interstellar medium is moving supersonically towards the Sun, since the sun's solar wind is moving supersonically away from the Sun. The point where the interstellar medium becomes subsonic is the bow shock; the point where the interstellar medium and solar wind pressures balance is at the heliopause; the point where the solar wind becomes subsonic is the termination shock. According to Robert Nemiroff and Jerry Bonnell of NASA, the solar bow shock may lie at around 230 AU from the Sun. However, data in 2012 from NASA's Interstellar Boundary Explorer (IBEX) and corroborated with results from the Voyagers, has found that due to refinements in the relative speed of the heliosphere and the local interstellar magnetic field strength it is believed the heliosphere is prevented from forming a bow shock in the region of our galaxy our sun is currently passing through.
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