© Pekka Parviainen

Kustavi, Finland

Latitude: 60° 32' 42'' N

Longitude: 21° 21' 19'' E

12 July 2005 2154 (Local Time)

Image P/S code: S.10U.3.5

Image I.D.: 5881

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  Noctilucent cloud: type S

  In some displays of noctilucent cloud, two or more forms may be seen simultaneously, and it is not unusual for types to intersect with each other. In this picture, bands cross billows to form bright knots (type S) at 3 and 4.

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

  © Pekka Parviainen
  Kustavi, Finland
  Latitude: 60° 32' 42'' N
  Longitude: 21° 21' 19'' E
  12 July 2005 2154 (Local Time)
  
  
  Image P/S code: S.10U.3.5
  Image I.D.: 5881
• 

  Noctilucent cloud: complex structure

  Often in displays of noctilucent cloud, several forms may be seen simultaneously. It is not unusual, therefore, for two or more intersecting or overlapping groups to give rise to complex structures such as bright knots or net-like structures, or types that do not fit the standard classifications. This picture, taken just before midnight from the Edmonton area of Alberta, Canada, shows one such complex display of noctilucent cloud. The central part of the display had a peculiar billow-like appearance with a number of lacunosus holes.

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

  © Mark Zalcik
  Namao, Alberta, Canada
  Latitude: 53° 43' 2'' N
  Longitude: 113° 29' 39'' W
  26 June 2014 2343 (Local Time)
  
  
  Camera direction: towards NW
  Image P/S code: P.10
  Image I.D.: 5687