Solar Corona Caused by Juniper Pollen in Texas

Details Solar Corona Caused by Juniper Pollen in Texas Solar Corona Caused by Juniper Pollen in Texas

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apopt..37.1486m&link_type=abstract

Applied Optics LP, vol. 37, Issue 9, pp.1486-1488

Physics

Optics

5

Scientific paper

Coronas are colorful, concentric rings centered on a bright light such as the Sun, the Moon, or even a streetlamp. Coronas are most commonly caused by water droplets or ice particles of relatively uniform size. Observers in Finland have reported spectacular clear-sky coronas caused by pollen grains. A clear-sky corona in central Texas occurred during the peak of the juniper pollinating season. The aerosol optical thickness at each of three wavelengths was highest when the corona was most prominent. Photographic measurements of the corona infer a particle diameter of 32.4 m. Because juniper pollen grains have a diameter of from 22 to 30 m, they are the aerosol most likely to have caused the corona.

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