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mesosphere, Tag
- Record Cold Upper Mesospheric Temperatures Suggest Another Good Noctilucent Cloud Viewing Season Tue, 2 Jun 20, 7:00amFrom Dr Roy Spencer’s Blog May 31st, 2020 by Roy W. Spencer, Ph. D. Noctilucent clouds (NLCs) are often visible in the extreme upper atmosphere (80-85 km altitude) well after sunset in the late spring and summer at...