F1layer

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F₁layer [¦ef ′wən ‚lā·ər]

(geophysics)

The ionosphere layer beneath the F₂layer during the day, at a virtual height of 120-180 miles (200-300 kilometers), being closest to earth around noon; characterized by a distinct maximum of free-electron density, except at high latitudes during winter, when the layer is not detectable.

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