Here's the best video I've even seen of the coronal rain.

 

http://www.nasa.gov/mission_pages/sdo/news/coronal-rain.html

 

For those who think of the solar wind as a steady stream of particles away from the Sun, coronal rain makes no sense at all. But if CMEs eject a large volume of heavy atoms (e.g., iron), which are drawn back to the Sun by the electric force, which acts more vigorously on heavy atoms due to their higher degrees of ionization, this makes perfect sense.