Post by pontiac1940 on Jan 15, 2020 4:19:29 GMT
It's cold here. I went to the city today and, as almost always, had my camera with me. To my delight, a faint sun halo was visible so I turned left instead of right to go to Costco and it was just a 2-minute drive for a fairly unobstructed view. From a Facebook post:
2:48 PM January 14, 2020
-25°C, wind ENE 17 -36°C windchill
f11, ISO 125, at 1/1,250 second.
Pays to keep a close eye, wear polarized sunglasses and schlep the camera when you go to Costco.
Earthsky says: The halos you see are caused by both refraction, or splitting of light, and also by reflection, or glints of light from these ice crystals. The crystals have to be oriented and positioned just so with respect to your eye, in order for the halo to appear.
It vanished when I drove back to Costco either "just because" or because I changed position.
2:48 PM January 14, 2020
-25°C, wind ENE 17 -36°C windchill
f11, ISO 125, at 1/1,250 second.
Pays to keep a close eye, wear polarized sunglasses and schlep the camera when you go to Costco.
Earthsky says: The halos you see are caused by both refraction, or splitting of light, and also by reflection, or glints of light from these ice crystals. The crystals have to be oriented and positioned just so with respect to your eye, in order for the halo to appear.
It vanished when I drove back to Costco either "just because" or because I changed position.
