22 degree circular halo sighted in Kolkota

Q.  What is a 22 degree circular halo?
- Published on 03 May 16

a. Red and blue ring around the sun
b. Orange and purple ring around the sun
c. Blue and green ring around the sun
d. None of the above

ANSWER: Red and blue ring around the sun
 
A red and blue ring around the sun, known as the 22 degree circular halo was seen on 30th April 2016 in the city.
  • This phenomenon was observed between 12:10 to 12:40 pm
  • The phenomenon commonly called the 22 degree circular halo of the sun or occasionally the Moon (also moon ring or winter halo) takes place when the rays of the sun or moon get deflected or refracted through hexagonal ice crystals present in cirrus clouds
  • These cirrus clouds are formed when water vapour freezes into ice crystals at altitudes 5 to 10 km above the surface of the earth
  • This phenomenon is common in cold countries but in India, the occurrence is rare and cannot be predicted
  • 22 degree halo was last observed on April 2013

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