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Another in a series of unusually strong solar storms to hit Earth produced stunning skies full of pink, purple, green and blue further south than normal, including parts of Germany, the United Kingdom, New England and New York.
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There were no immediate reports of power or communications outages.
The US National Oceanic and Atmospheric Administration issued a severe geomagnetic storm warning on Wednesday after a solar flare was detected earlier in the week. Such a storm increases the likelihood of auroras – also known as northern lights – and can temporarily disrupt power and radio signals.
NOAA's Friday forecast shows continued above-normal activity, but chances of another overnight show are slim further south in Canada and in the northern Plains states.
What causes the Northern Lights?
The sun sends more than heat and light to Earth – it sends energy and charged particles known as the solar wind. But sometimes this solar wind becomes a storm. The Sun's outer atmosphere occasionally “burps” huge bursts of energy called corona mass ejections. They produce solar storms, also known as geomagnetic storms, according to NOAA.
Earth's magnetic field protects us from much of it, but particles can travel along magnetic field lines along the north and south poles and enter Earth's atmosphere.
When particles interact with gases in our atmosphere, they can produce light – blue and purple from nitrogen, green and red from oxygen.
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Why have there been so many solar storms lately?
Solar activity waxes and wanes in a cycle that lasts about 11 years, astronomers say. The sun appears to be near the peak of this cycle, known as solar maximum. It's unclear exactly when the cycle will begin to slow.
In May, the sun shot its brightest in almost two decades. This happened days after severe solar storms hit Earth and triggered auroras in unknown places across the Northern Hemisphere.
What's the best way to see the northern lights?
NOAA advises those hoping to see the Northern Lights to stay away from city lights.
The best viewing time is usually an hour or two before or after midnight, and the agency says the best times are around the spring and fall equinoxes, due to the way the solar wind interacts with the Earth's magnetic field. Earth.