spread-F

From Glossary of Meteorology
Term derived from ionospheric sounding when the echo from the F-region of the ionosphere becomes blurred, with multiple echoes occurring over a range of distances and frequencies.

Spread-F is basically caused by the existence of many small-scale irregularities in electron density within the echoing region, instead of the normal smooth variation of electron density with height.

  1. Regular markings on an instrument used to allow the reading of the measured quantity or setting.
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