This map from 13-June-2003 covers from 15:20z to 17:21z. MUF rised very quickly and allowed a very few QSOs between F/EA9 and Italy, then it went down again for about half an hour when a few more contacts were made between EA/EA6 and SV/South Italy. This was a very spotty opening with only some signals appearing on 144 MHz from time to time.

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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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