corona captured by Till Credner and Sven Kohle (atmospheric
optics site) on the island of Tenerife in May 2000.
Fragments of three to four rings are visible above the aureole and
to add to the spectacle, crepuscular
rays fan in all directions.
The corona forming droplets are close because the rings shine in front
of the nearby trees.
Photo ©Till Credner & Sven Kohle and reproduced
In the opposite direction there was a glory.
The droplets creating both were likely of the same size and thus the
two sightings provide a test of the IRIS
Mie scattering simulator.
In the split image the angular scale (major ticks 1°) were gauged
from the camera lens focal length.
The IRIS corona best fitting the image was from 13.5 micron diameter
droplets. The rings rather than the aureole were used for fitting
because the aureole's size in images and simulations depends too much
on exposure and brightness settings. No spread of droplet sizes was
needed, monodisperse droplets best matched the image.
Did the same sized droplets fit the glory seen at the same time? Yes
they did, check the glory image.