Noctilucent (mesospheric) clouds represent especial kind of athmospheric phenomena. In contrast to 'normal' clouds they are located in upper atmosphere (mesosphere) at altitudes about 80 kilometers, which is almost space. Noctilucent clouds can be visible in a deep twilight in the summer months at latitudes between 50° and 70° north and south. But it's extremely rare phenomenon and even at these latitudes they appear 2-3 times per summer only (in the best case). Being amateur astronomer for 35 years... continue reading
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