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ionogram

From Wiktionary, the free dictionary

English

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Etymology

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From iono- +‎ -gram.

Noun

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ionogram (plural ionograms)

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Wikipedia
  1. A display of the data produced by an ionosonde; a graph of the virtual height of the ionosphere plotted against frequency.
    Data from ionograms may be used to measure changes in the Earth's ionosphere due to space weather events.