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isochasm

[ahy-suh-kaz-uhm]

noun Meteorology.

a line on a map or chart connecting points where auroras are observed with equal frequency.

Origin:
1880–85; iso- + chasm

Related forms

i·so·chas·mic, adjective

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Isochasm is always a great word to know.

So is frost smoke. Does it mean:

an ice fog caused by extremely cold air flowing over a body of comparatively warm water, especially in polar regions

precipitation consisting of numerous, minute droplets of water

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