This map from 5-July-2003 covers from 14:10z to 20:00z. What an incredible openning ! A cloud (possibly the same than in the morning) appeared over Romania, then moved to the east over southern Ukraine and finally split into another cloud over the Balkans. It lasted for about five hours and thanks to the reinforced activity, because of the contest, allowed many thousands of QSOs.
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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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