It's been a puzzle for 60 years.
of 5,778 kelvin is so hot that gas there is ionized — that is, atoms are stripped of their electrons and the gas becomes a sea of electrically charged ions and free electrons, which we call a plasma. The plasma is sufficiently diffuse that the ions rarely come into contact with one another, so the plasma is said to be collision-less, and the ions and electrons inside it all move as a group, rather than on individual trajectories crashing into each other.
Solar physicists led by Yi Hsin Liu of Dartmouth College in New Hampshire have used the MMS data to finally show what happens during fast reconnection. During such an event, the ions and electrons become decoupled from each other and begin to move perpendicular to the sun's magnetic field lines, creating an unstable energy vacuum through the interplay of electric and magnetic fields.
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