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BSL Sign Languages of
noctilucent clouds (NLCs)
(BSL Version)
BSL Explanation of
noctilucent clouds (NLCs)
(BSL Version – Glossary of Astronomy)
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Glossary – Noctilucent clouds (NLCs)
- NLCs stands noctilucent clouds
- shimmer in electric blue or silvery hues, glowing high above the horizon during twilight, long after the Sun has sets.
- NLCs form in the mesosphere, 47 to 53 miles (75 to 85 km) above Earth—making them the highest clouds in our atmosphere.
- made of tiny ice crystals that condense around dust particles, often from meteors or volcanic ash
- most visible in summer months from June to early August in the Northern Hemisphere.
- look low on the horizon in the northwest after sunset or northeast before sunrise.
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