© Mila Zinkova

San Francisco, California, United States of America

Latitude: 37° 45' 55'' N

Longitude: 122° 30' 44'' W

23 February 2016 1516 (Local Time)

Image P/S code: P.13.1.1.1

Image I.D.: 4658

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  Rare circular halos of non-typical radii

  On rare occasions, circular halos may appear that are not produced by the more common hexagonal prism ice crystals and they have radii that are not the “typical” 22° and 46°. Such rare circular halos of non-typical radius are produced by pyramidal ice crystals. 

  This picture from San Francisco, California, USA, shows a series of circular halos. The innermost halo has a radius of 9°. There is also an 18° halo together with halos of other radii.

  Links in the image description will highlight features on the image. Mouse over the features for more detail.

  © Mila Zinkova
  San Francisco, California, United States of America
  Latitude: 37° 45' 55'' N
  Longitude: 122° 30' 44'' W
  23 February 2016 1516 (Local Time)
  
  
  Image P/S code: P.13.1.1.1
  Image I.D.: 4658