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  1. Article

    Open Access

    The Sun’s Alfvén Surface: Recent Insights and Prospects for the Polarimeter to Unify the Corona and Heliosphere (PUNCH)

    The solar wind is the extension of the Sun’s hot and ionized corona, and it exists in a state of continuous expansion into interplanetary space. The radial distance at which the wind’s outflow speed exceeds th...

    Steven R. Cranmer, Rohit Chhiber, Chris R. Gilly, Iver H. Cairns in Solar Physics (2023)