© Pekka Parviainen
Eura, Finland
Latitude: 61° 7' 47'' N
Longitude: 22° 7' 52'' E
02 June 2010 0559 (Local Time)
Image P/S code: P.13.2.3
Image I.D.: 5723
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Corona due to diffraction of light through pollen
A corona is defined as one or more sequences of small-diameter coloured rings centred on the Sun or Moon. In each sequence, the inside ring is violet or blue; the outside ring is red; and other colours, such as green and yellow, may occur in between(1). The innermost sequence, which is generally not more than 5° in diameter, usually has a central area that is very bright and a distinct outer ring of reddish or chestnut colour called the aureole.
Coronae are caused by the diffraction of light passing through small particles of uniform size. Usually these are water drops or ice particles, as in mist, fog or thin cloud, but in instances where there is a large amount of tree pollen in the air, these particles can diffract light equally well to produce coronae, such as the one illustrated in this photograph taken in Finland.
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© Pekka ParviainenEura, FinlandLatitude: 61° 7' 47'' NLongitude: 22° 7' 52'' E02 June 2010 0559 (Local Time)Image P/S code: P.13.2.3Image I.D.: 5723
Corona due to diffraction of light through pollen
Coronae consist of one or more sequences of small-diameter coloured rings centred on a light source, such as the Sun or Moon. Coronae are caused by the diffraction of light passing through small particles of uniform size. These are usually water drops or ice particles, as in mist, fog or thin cloud. However, coronae can also be produced in situations where there is a large amount of tree pollen in the air, as in this photograph from Finland. The elongated nature of this corona is a result of the pollen being non-spherical.
Links in the image description will highlight features on the image. Mouse over the features for more detail.
© Pekka ParviainenPyhäranta, FinlandLatitude: 60° 57' 1'' NLongitude: 21° 26' 41'' E02 June 2010 1445 (Local Time)Image P/S code: S.13.2.3Image I.D.: 5722