|Map with 50 MHz QSOs-QSLs for the 2014 Es season (updated 2014-07-28)|
The June 2014 issue of Radio User contains a Sporadic-E feature article by Keith Hamer and Garry Smith. It deals more with Es long distance TV reception than with 50 MHz amateur radio activity, but contains a few interesting ideas and observations:
- It seems that there is a positive correlation between Es openings and low-pressure weather systems and thundery weather. While there is less chance for an Es opening during fair weather (anticyclonic conditions), which favors tropospheric propagation.
- The authors believe that long distance Es propagation, usually attributed to multi-hop Es, is actually caused by signal paths close to the hotizon, which arrive to the Es layer at a very shallow angle.
- When the opening extends to higher frequencies, propagation on the higher frequencies is better than on 50 MHz, which tends to be "turbulent".