This map from 5-July-2003 covers from 7:12z to 9:10z. There was a nice cloud over central Italy allowing many QSOs across Europe and also two other minor clouds over Turkey that allowed a bunch of great QSO from Middle East. Then the MUF dropped till the afternoon when raised again spectacularly over eastern Europe.

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It 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 QSOs and reports of European stations. 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. and 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 the lack of data mentioned above.

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