This map from 14-May-2004 covers from 08:40z to 10:21z. The cloud was located over central-northern Italy spreading towards Spain. MUF was quite high, specially over Italy, and it was over 144 MHz for a few minutes at least in three ocasions, at 8:50, 9:34 and 10:00 UTC.
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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.
| Other Sporadic-E maps | MUF forecast |