Plasma Frequency and Coronal Electron Density

Plasma Frequency and Coronal Electron Density

. The plasma frequency (right axis) that corresponds with the electron density (left axis) in the corona, as inferred from measurements during total eclipses of the Sun. The dashed line is for a coronal hole. As the corona expands out to larger distances from the Sun, and into an ever-larger volume of space, it becomes thinner and less dense, and the plasma frequency is smaller.

Copyright 2010, Professor Kenneth R. Lang, Tufts University