This map from 16-June-2003 covers from 13:46z to 18:36z. This was THE OPENING of the year ! An very large and stable cloud over central France with very high MUF and lasting for hours...Many thousands of QSOs were made almost all over Europe. This map is VERY large because of the length of the opening and the nearly 1500 QSOs analized to make it possible..so be patient downloading it...it's worth waiting !
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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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