A magnificent rainbow observed in Parkano, Finland 22.7.2012

Observed phenomena: Rainbow
Observed rainbow -phenomena:

  • Primary arc
  • Secondary arc
  • Interference arcs with primary arc
  • Alexander’s dark band
  • Rainbow spikes
  • Reflected rainbow

Date: 22.7.2012
Time: 20:23-21:05
Observing place: Parkano, Finland
Observing method: Photography
Technical information about photographing equipment: Canon EOS 1100D, Canon EF-S 18-55mm IS

On 22nd of July I observed a really magnificent rainbow in Parkano, Finland. It all started @ 20:23, when I observed a short sections of rainbow. With the ordinary rainbow, I observed also a short and very faint “extra-rainbow” which was actually a reflected rainbow from the primary arc! It was the very first time for me to observe a reflected rainbow in my life!

A little bit later, @ 20:40, a full and bright primary arc with full secondary arc stretched over the sky of Parkano! Now also Alexander’s dark band and interference arcs with primary arc were visible!

Nice rainbow spikes were visible during the whole display. And when the rainbows itself had already disappeared @ 21:00, the rainbow spikes, or anticrepescular rays, were still visible.

Evolution of this rainbow display

20:23-20.28 – two short sections of primary arc with reflected primary arc
20:28-20:40 two short sections of primary arc
20:40-20:45 full primary arc, full secondary arc, interference arcs with primary arc, Alexanders dark band clearly visible
20:45-21:00 two short sections of primary- and secondary arc, interference arcs with primary arc
21.00-21.05 rainbows had disappeared, anticrepescular rays still visible

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