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    auroral substorms tagged posts

    Jupiter’s ‘Dawn Storm’ Auroras are surprisingly Earth-like

    March 18, 2021, Categories  Astronomy/Space

    Evolution of a Dawn Storm in Jupiter's Polar Aurorae
    Evolution of a dawn storm in Jupiter’s polar aurorae. The imagery for the video was collected using data from the Ultraviolet Spectrograph instrument aboard NASA’s Juno spacecraft. (See video in the article below for more detail.) Credit: NASA/JPL-Caltech/SwRI/UVS/ULiège

    Spectacular ultraviolet storms in big planet’s aurora, generated by charged particles from its volcanic moon, Io. The midnight births of the dramatic bright surges in Jupiter’s aurora known as dawn storms are captured in a new study of data from the Juno space probe.

    The storms, which consist of brightenings and broadenings of the dawn flank of an oval of auroral activity that encircles Jupiter’s poles, evolve in a pattern surprisingly reminiscent of familiar surges in the aurora that undulate across Earth’s po...

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    Auroral Mystery Solved: Sudden Bursts caused by Swirling Charged Particles

    December 21, 2015, Categories  Astronomy/Space

    On the left is and aurora oval before the auroral breakup occurs On the right is a supercomputer simulation reveals how auroral breakups develop Hot charged particles, or plasmas, gather in near-Earth space -- just above the upper atmosphere of the polar region -- when magnetic field lines reconnect in space. This makes the plasma rotate, creating a sudden electrical current above the polar regions. Furthermore, an electric current overflows near the bright aurora in the upper atmosphere, making the plasma rotate and discharge the extra electricity. This gives rise to the 'surge', the very bright sparks of light that characterize substorms. Credit: Kyoto University

    On the left is and aurora oval before the auroral breakup occurs On the right is a supercomputer simulation reveals how auroral breakups develop Hot charged particles, or plasmas, gather in near-Earth space – just above the upper atmosphere of the polar region – when magnetic field lines reconnect in space. This makes the plasma rotate, creating a sudden electrical current above the polar regions. Furthermore, an electric current overflows near the bright aurora in the upper atmosphere, making the plasma rotate and discharge the extra electricity. This gives rise to the ‘surge’, the very bright sparks of light that characterize substorms. Credit: Kyoto University

    A supercomputer model revealed the rotation of plasma creates electrical currents in the near-Earth space, ultimately triggering...

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