This map from 8-July-2003 covers from 15:20z to 18:38z. This was long but again spotty opening due to cloud that formed over central France. It lasted till 17:00z when MUF dropped, but at 17:50 it raised again over southern France. A good QSO between DL and EA8 was achieved with the help of good tropo conditions from EA8 to Spanish mainland at that 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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