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A recent ADAP showed
a lunar halo pictured at the ATCA, and today's
features a solar halo captured at the Canberra Deep Space Communication Complex.
They are created when the sun- oo moon-light is refracted by ice crystals in thin cirrus clouds.
The CanberraDSN twitter feed
notes "The 22-degree halo is exhibiting other features like sun dogs, upper tangent arcs,
sunvex and suncave Parry arcs, and the hint of a supralateral arc."
Sunvex and suncave Parry arcs refer to their shape which are convex or concave towards the sun,
respectively.
The arcs are named after William Parry, who observed them in 1820 during an Arctic expedition.
(As noted
in another recent ADAP, the blue dots in the image are internal reflections of the bright sun
within the camera.)
(Image credit: CanberraDSN)
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