This map from 11-May-2004 covers from 16:15z to 16:46z. 50 MHz were again wide open all over Europe almost whole day. Finally at 16:28 the MUF reached 144 MHz for a few minutes over south-east France, allowing as far as I know only one QSO from CT to DL.
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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. 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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