Sun boundary map tracks shifting Alfven surface over solar cycle
Cambridge, MA (SPX) Dec 14, 2025
Astronomers have assembled the first continuous, two-dimensional maps of the outer edge of the Sun’s atmosphere, tracing the boundary where the solar wind escapes the Sun’s magnetic control. By combining these global maps with close-up measurements, researchers at the Center for Astrophysicshysics | Harvard and Smithsonian report that this boundary expands and becomes more irregular and spiky as
Published by SpaceDaily on 12/14/2025
