DX Eternal Enigmas?

DX Eternal Enigmas?

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Propagation type

Distances regularly achievable in km (144MHz 2m band):

Line of sight 0-100 km (Dependant upon both antenna's height above sea level)

Tropo Scatter 100-500km

Tropo Ducting 200-1000km (Sea path exceptionally possible up to 3000km)

Aurora 250-1000km

Meteor Scatter 700-2300km

Sporadic Es 1100-2100km

Sporadic Es

Within the E region, very thin regions of extremely dense ionization can form. These regions can apparently be caused by several mechanisms, and have a wide variety of characteristics. Because of this, one single definition cannot be completely accurate. According to the Space Environmental Services Center, "sporadic E (Es) is transient, localized patches of relatively high electron density in the E region of the ionosphere which significantly affect radio wave propagation. Sporadic E can occur during daytime or nighttime, and it varies markedly with latitude. Es can be associated with thunderstorms, meteor showers, solar activity, and geomagnetic activity."

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