The Sun and the Heliosphere as an Integrated System

Physics

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Interplanetary Physics: Heliosphere/Interstellar Medium Interactions, Interplanetary Physics: Solar Wind Plasma, Interplanetary Physics: Solar Wind Sources

Scientific paper

The heliosphere is a bay in the interstellar space around the Sun where the solar wind blows lustily and holds back the magnetic fields and plasma of the local interstellar cloud. According to recent measurements from the Voyager 1 spacecraft, the radius of this bay, which is where the solar wind ceases to be supersonic, is about 94 astronomical units (AU) (1 AU = distance from the Sun to Earth). Much of what happens at the outer edges of the heliosphere is determined by what happens on the Sun. Magnetic fields generated in the solar interior boil to the surface and emerge into the outer atmosphere, called the corona, where they destabilize and propel coronal mass ejections (CMEs) into the heliosphere. The corona is also the source of the solar wind.

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