1. A new model of the Sun’s open magnetic flux

    The solar minimum that bottomed out from 2006 to 2010 was the longest and deepest since modern space observations began. Among other effects, it reorganized the areas of flux from open magnetic field lines that produce solar wind. NCAR postdoctoral researcher Liang Zhao is using data from the last two minima to revise a model of how open magnetic flux is transported through the solar atmosphere.

    • Sun + Space Weather

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  2. 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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  3. 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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  4. 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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  5. 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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