This map of 6-August-2004 covers from 16:40z to 19:25z. MUF rised very quick and over a large portion of the Mediterranean, covering from central Italy to Spain. The most outstanding were the two QSO made between EA8 and I2 at a distance over 2900 km. At first sight I don't see any indication that points to double hop or chordal as an explanation of those QSO, so my guess is that this time it was a combination of tropo plus sporadic-E (just must guess anyway).
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This map 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 QSO 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 that lack of data.
| Other Sporadic-E maps | MUF forecast |
You can help develop these maps!. After the openings, please send me your logs of 50, 70 and 144 MHz QSO via sporadic-E (Much preferably in ADIF format)