it's a diffraction corona

Comments and questions about the APOD on the main view screen.

it's a diffraction corona

Post by Dave » Thu Sep 23, 2004 4:39 am

It can't be a glory as the colors are in the wrong order. Also most glories are
not as distict as his photo.

Otherwise, many of the same physical properties of a glory apply (bright
center region, shadow of obscuring object, etc.)

I do believe the powder on the ground is some sort of reflective medium
such as small glass beads or something like that.

The angle of incidence of the sun's rays on June 20 (summer solstice) in mid-day would be very nearly 90-degrees even as far north as MA resulting in a symmetrical display,

--Dave in Dallas

Dan Cordell
Posts: 99
Joined: Mon Jul 26, 2004 8:55 pm
Location: Michigan Tech

Post by Dan Cordell » Thu Sep 23, 2004 4:40 am

Please keep all discussion related to Dr. Lewin's challenge in this thread.
Dan Cordell, Giant Space Cow