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<p>of the number of sunspots visible on the disk, the rate at which <a href="page.php?w=solar_flares">flares</a> occur, or the intensity of the 10-cm <a href="page.php?w=Solar_cycle">radio flux</a>, also affects the ionosphere because of variations in the intensity of the ionizing radiations in the X-ray and <a href="page.php?w=extreme_ultraviolet">EUV</a> bands." The F2 layer also exhibits anomalies due to <a href="page.php?w=diurnal_cycle">diurnal variation</a> and seasonal variation. Additionally, the F2 layer at mid-latitudes does not disappear</p><p>
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