This map of 23-May-2004 covers from 10:20z to 12:44z. It's a nice map where you can observe the evolution of two ES clouds. One over nortern Europe that lasted for many hours, moving westwards, but which didn't reach a MUF of more than 100 MHz, and a second cloud, over western Ukraine that aparently reached a high MUF very quickly, allowing quite a few QSO on 144 MHz between 10:45 and 12:30z. There are some reports pointing out that another sporadic-E opening took place some time before between Israel and The Balcans, but it's not shown here because of the lack of details.
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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 |
Data from the ionosonde station of Leibniz-Institute of Atmospheric Physics in JO64 / Germany)
This sequence of ionograms covers from 9:45 to 12:30z at 15 minutes intervals. Unfortunately there were no more ionograms after 12:30, but even so you can clearly watch the appearance of ES starting at 10:15 (The horizontally extending line at about 100 km height, showing the increase of the foEs). This station was right below the northern cloud shown on the map above.
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)