The event coincides with the solar maximum - a period of extreme activity that occurs every 11 years.
For decades, scientists have been scratching their heads about why the corona, a hot plasma that extends millions of kilometers from the core, is so much hotter than the solar surface.
The corona will "look much more complex" this time, Klimchuk says.
The Sun's outer atmosphere, named for its crown-like appearance, is one of astronomy's biggest unsolved mysteries, says James Klimchuk, a solar physicist at the NASA Goddard Spaceflight Center.
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