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The Sun's magnetic field and solar wind - mainly in the form of electrons and protons coming out of the Sun - protects the entire Solar System by acting as a sort of shield from cosmic rays (very energetic particles and radiation from outer space).
The most persuasive evidence that Voyager 1 has crossed the termination shock is its measurement of a sudden increase in the strength of the magnetic field carried by the solar wind, combined with an inferred decrease in its speed.
They will focus on the places above the poles where the wind pierces the earth's magnetic defences and causes, among other things, the shimmering lights of the aurora borealis and aurora australis, and interference with radio communications.