From Nature:
Puffed-up Sun. Data from inside the Sun’s corona — the outermost layer of its atmosphere — helped astrophysicists to create a sharper picture of the Sun’s shifting boundaries than ever before. The corona’s outer edge, depicted in this illustration, has a rough, spiky shape that expands and contracts like a pufferfish as the Sun becomes more or less active. The research could help scientists to better predict how solar activity affects Earth’s magnetic field, satellites, human health and atmospheric effects such as auroras.
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