This map from 28-June-2003 covers from 15:12z to 17:02z. A nice openning towards the middle east for those lucky guys in northern I, S5 and YU. At the same time, and using the same cloud, 9H and IT9 stations were working into UR and UA. A curious QSO was also made at the same time between EA5 and SV, which indicates a second small cloud over the Mediterranean. It's not the first time this year that a small cloud appears over the Mediterranean allowing east-to-west QSOs at the same time there is another major cloud somewhere else (see map of 22-June-2003)
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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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