a Team of scientists from Russia, Finland and Spain have uncovered the reason “otvorenie sky” over Astrakhan in July 1670. About the extraordinary natural phenomenon was written in the “Tale of Peter Zolotarev”, who said that “we need all Astrahani opened the sky.”
it Turned out that the described in the XVII century the phenomenon was caused by the so – called Parghelia- optical effect in which the level of Sun spots appear iridescent due to refraction of light in anisotropic oriented ice crystals in the atmosphere.
Previously, scientists believed that this phenomenon was the case of Aurora, which was due in mid-latitudes the geomagnetic storm amid the calm Maunder minimum – period of decreased sunspot number in 1645-1715 years.
https://lenta.ru/ Tape.ru
09:27, 12.12.2016
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