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Noctilucent Cloud Morphology
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![](https://britastro.org/wp-content/uploads/2018/02/nlctype1.jpg) |
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VEIL – a simple structureless sheet, sometimes as a background to other forms.V |
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![](https://britastro.org/wp-content/uploads/2018/02/nlctype2.jpg) |
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BANDS – lines or streaks sometimes parallel or crossing at small angles, not particularly organised. |
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![](https://britastro.org/wp-content/uploads/2018/02/nlctype3.jpg) |
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WAVES – sometimes called BILLOWS. Fine herring-bone structure like the sand ripples on a beach at low tide. Very characteristic of NLC. |
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![](https://britastro.org/wp-content/uploads/2018/02/nlctype4.jpg) |
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WHIRLS largescale looped or twisted structures. |
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