This map of 31-May-2005 covers from 14:00z to 18:27z. HUGE, HUGE, HUGE!!!!  Without doubt the hugest Sporadic-E cloud I have ever seen. At 14:05 the first QSO were made thanks to an emerging cloud above Northern SV/YU/T9/LZ. At 15:00 a separate cloud appears briefly above Northern Germany. At 15:15 the first cloud begins to increase its ionization and spread till covering almost all Southeast of Europe. Several QSO above 2900 Km were made and the MUF reached 219 MHz !.

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This map shows the evolution, size and MUF of the sporadic-E cloud that caused the opening on 144 MHz. and it is an estimation based on the information I have picked up here and there of QSO and reports of European stations and basically from DX-spots collected by DXMAPS. I don't claim it to be accurate but just an estimation that could help understand what happened that day.

Also please notice that sometimes you will see MUF rise very quickly.  This is because of the almost complete lack of data for frequencies between 51 and 144 MHz. that leads to shown MUF rising almost 90 MHz in one minute.  You should understand that this is not the usual behaviour of MUF, but the result of that lack of data.

| Other Sporadic-E maps | MUF forecast |

You can help develop these maps!. After the openings, please send me your logs of 50, 70 and 144 MHz QSO via sporadic-E (Much preferably in ADIF format)

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