Today, NASA’s Solar Dynamics Observatory is monitoring sine wave 400,000 km long. It’s an enormous filament of magnetism slithering over the sun’s northeastern limb:
One of the wave troughs appears to be passing through the core of sunspot 1282. If so, an eruption of the sunspot could have an interesting ripple effect on the greater filament, perhaps even causing it to collapse. (SpaceWeather)
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