The LEFT image is a white-light polarization brightness (pB)
composite image of the solar corona observed on 1999 November 12
between 17:00 and 22:00 UT. The solar corona images were taken with
the ground-based MLSO/HAO Mark IV (middle) and the LASCO C2/SOHO
(outermost image) coronagraphs. The innermost picture of the solar
disk is an H-alpha image of the Sun taken with the ground-based
BBSO telescopes.

The RIGHT image is a synthesized pB map from a 3D empirical model
of the corona derived from UVCS observations of the plasma properties
inside and outside an equatorial coronal hole.
The large equatorial hole (dark region in the image) is visible 
above the west limb.

(Miralles et al. 2001, Astrophys. J., 549, L257)