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  1. The inner lives of red giant stars

    An international team of astronomers that includes NCAR’s Savita Mathur has observed mixed waves—a mixture of acoustic and gravity waves—that run all the way to the cores of red giant stars. Astronomers already knew that such waves (known as stellar oscillations) existed, but until now had only observed pure acoustic waves traveling through the outer parts of stars.

    • Sun + Space Weather

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  2. A close-up of the solar limb

    The story behind spicules

    One of the most enduring mysteries in solar physics is why the Sun’s outer atmosphere, or corona, is millions of degrees hotter than its surface. Now scientists believe they have discovered a major source of hot gas that replenishes the corona.

    • Sun + Space Weather

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  3. Tropical triggers for polar stratospheric warmings

    A new study from NCAR uses an innovative computer model to investigate events called sudden stratospheric warmings (SSWs) in the Arctic atmosphere. The study focuses on how two atmospheric patterns based in the tropics, the El Niño–Southern Oscillation and Quasi-Biennial Oscillation, affect SSWs.

    • Sun + Space Weather

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  4. satellite image of area on solar disk with spicules emerging from the surface

    Plasma jets are prime suspect in solar mystery

    Structures called spicules may explain why the Sun’s corona is much hotter than its surface, according to a new paper in Science.

    • Sun + Space Weather

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  5. Savita

    Listening to the galaxy

    In a bid to unlock longstanding mysteries of the Sun, including the impacts on Earth of its 11-year cycle, a team of scientists from NCAR, France, and Spain has successfully probed a distant star.

    • Sun + Space Weather

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