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    Substorms tagged posts

    Aurora mysteries unlocked with NASA’s THEMIS mission

    August 17, 2020, Categories  Astronomy/Space

    The photograph was taken east of Saskatoon on winter solstice in 2015 with a 81% illuminated waxing gibbous Moon. It was processed with PixInsight to remove streaks caused due to an accidentally nudged tripod during exposure while attempting to retain realistic star shapes and colors. The exposure time was 2.5 seconds. Credit: Alan Duffy

    A special type of aurora, draped east-west across the night sky like a glowing pearl necklace, is helping scientists better understand the science of auroras and their powerful drivers out in space. Known as auroral beads, these lights often show up just before large auroral displays, which are caused by electrical storms in space called substorms...

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    NASA’s THEMIS sees Auroras move to the rhythm of Earth’s Magnetic field

    September 13, 2016, Categories  Astronomy/Space

    An artist's rendering (not to scale) of a cross-section of the magnetosphere, with the solar wind on the left in yellow and magnetic field lines emanating from the Earth in blue. The five THEMIS probes were well-positioned to directly observe one particular magnetic field line as it oscillated back and forth roughly every six minutes. In this unstable environment, electrons in near-Earth space, depicted as white dots, stream rapidly down magnetic field lines towards Earth's poles. There, they interact with oxygen and nitrogen particles in the upper atmosphere, releasing photons and brightening a specific region of the aurora. Credit: Emmanuel Masongsong/UCLA EPSS/NASA

    An artist’s rendering (not to scale) of a cross-section of the magnetosphere, with the solar wind on the left in yellow and magnetic field lines emanating from the Earth in blue. The five THEMIS probes were well-positioned to directly observe one particular magnetic field line as it oscillated back and forth roughly every six minutes. In this unstable environment, electrons in near-Earth space, depicted as white dots, stream rapidly down magnetic field lines towards Earth’s poles. There, they interact with oxygen and nitrogen particles in the upper atmosphere, releasing photons and brightening a specific region of the aurora. Credit: Emmanuel Masongsong/UCLA EPSS/NASA

    For the first time, scientists have directly mapped Earth’s fluctuating magnetic field and resulting electrical currents to...

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