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Sporadic E or Es (E Skip) can allow VHF signals (30-300 MHz) to propagate over long distances via a reflection from the E layer. Sporadic E is generally classified into three types by, Mid-latitude, Equatorial and Auroral. From the month of May through to August is best for Sporadic E (Es) which can affect signals on all bands from 14-144MHz, although it is most commonly noticed on 28MHz and 50MHz. Openings for 2m may happen twice a year. Sporadic E or Es (E Skip) can allow VHF signals (30-300 MHz) to propagate over long distances via a reflection from the E layer. Sporadic E is generally classified into three types by, Mid-latitude, Equatorial and Auroral. Sporadic E propagation bounces signals off smaller "clouds" of unusually ionized atmospheric gas in the lower E region.Sporadic E activity peaks predictably in the summertime in both hemispheres. In North America, the peak is most noticeable in mid-to-late June, trailing off through July and into August. From the month of May through to August there is noteworthy Sporadic E which can affect signals on all bands from 14-144MHz, although it is most commonly noticed on 28MHz and 50MHz. Openings for 2m may happen twice a year. Sporadic E activity peaks predictably in the summertime in both hemispheres. In North America, the peak is most noticeable in mid-to-late June, trailing off through July and into August. During sporadic E events, the E layer becomes heavily ionized in specific small thin areas, sometimes called clouds. This can last a few minutes or up to several hours. The effect is normally more pronounced with lower frequencies. Sporadic E propagation bounces signals off smaller "clouds" of unusually ionized atmospheric gas in the lower E region.The cause of Es ionization is not precisely known. Maybe it has to do with wind shear in the upper atmosphere or storm activity. Sporadic E is easily detected by monitoring 28MHz and 50MHz. The cause of Es ionization is not precisely known. Maybe it has to do with wind shear in the upper atmosphere or storm activity. Sporadic E is easily detected by monitoring 28MHz and 50MHz.