NASAのインスタグラム(nasa) - 4月17日 06時33分
Catching heat in Saturn’s atmosphere 🪐A mystery that’s unravelling …
This false-color composite image, constructed from data obtained by our Cassini spacecraft, shows the glow of auroras streaking out about 1,000 kilometers or 600 miles from the cloud tops of Saturn's south polar region.
The upper layers in the atmospheres of gas giants — Saturn, Jupiter, Uranus and Neptune — are hot, just like Earth's. But unlike Earth, the Sun is too far from these outer planets to account for the high temperatures.
New analysis of Cassini’s data finds a viable explanation for what's keeping the upper layers of Saturn, and possibly the other gas giants, so hot: auroras at the planet's north and south poles. Electric currents, triggered by interactions between solar winds and charged particles from Saturn's moons, spark the auroras and heat the upper atmosphere.
Image Credit: NASA/JPL/ASI/University of Arizona/University of Leicester
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