Moon Dogs, Iceland










































Moondogs near Mt Hekla, Iceland imaged by Ágúst Guðmundsson on 21st March '08. ©┴g˙st Gu­mundsson, shown with permission

Although the temperature was between -5 and -7°C there was no diamond dust and Ágúst's many images indicate that crystals in high cirrus produced the display. In addition to the bright moondogs a paraselenic circle courses through the 18° high moon. A 22° halo circles it topped by a lunar upper tangent arc. That was not all, high above was a lunar circumzenithal arc touched by either a rare 46° halo or supralateral arc.