What’s the News: An international team of researchers, led by the National Center for Atmospheric Research, has learned that large magnetic waves are partly to blame for the Sun’s immensely hot corona. The study, published in the journal Nature, also suggests that the waves could be the driving force behind the solar wind.

What’s the Context:

The corona is the outer atmosphere of the Sun, which is only visible by the naked eye during a solar eclipse. It has fascinated solar physicists for decades because it’s over 20 times hotter than the surface of the sun—you’d expect that the further away you get from a heat source, the cooler it gets.
One possible explanation for the corona’s extreme temperature has been Alfvén waves, first proposed by Nobel Prize-winner Hannes Alfvén. Alfvén waves are high-speed magnetic oscillations thought to travel along the Sun’s magnetic field lines, transporting large amounts of energy (in the ...