coronal hole

Alternative definitions (2), class: vernacular (0)
Term: coronal hole

An extended region of the corona, exceptionally low in density and associated with unipolar photospheric regions having ”open” magnetic field topology. Coronal holes are largest and most stable at or near the solar poles, and are a source of high-speed solar wind. Coronal holes are visible in several wavelengths.  Transequatorial coronal holes are the source of many recurrent geomagnetic disturbances since their lifetimes are months to years.  The solar wind emanating from these holes is characteristically high in velocity and low in density.

Created 2023.04.16
Last Modified 2023.04.16
Contributed by Ryan McGranaghan