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    understanding the origin and acceleration of the solar wind tagged posts

    NASA sounding Rocket finds Helium Structures in Sun’s Atmosphere

    August 11, 2020, Categories  Astronomy/Space

    A composite image of the Sun showing the hydrogen (left) and helium (center and right) in the low corona. The helium at depletion near the equatorial regions is evident.
    Credits: NASA

    Helium is the second most abundant element in the universe after hydrogen. But scientists aren’t sure just how much there actually is in the Sun’s atmosphere, where it is hard to measure. Knowing the amount of helium in the solar atmosphere is important to understanding the origin and acceleration of the solar wind—the constant stream of charged particles from the Sun.

    In 2009, NASA launched a sounding rocket investigation to measure helium in the extended solar atmosphere—the first time we’ve gathered a full global map...

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