Greyline observation on 160m- KC2STA night session

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That night a highway was opened between Dan and Europe on 160m. A continuous signal throughout a night is rare.
Between 00:12z and 06:42z, I spotted KC2STA 47 times without missing period.
This is an opportunity to draw a graph to highlight the gray line near my sunrise (06:27z).

An hour before SR SNR was -22,
30mns before SR SNR is -11 or +11 db of gain!!
At SR SNR is still -14 to collapse then in few minutes (06:42z).

Dan was spotted by six other European stations: OZ7IT, SM6WZI, PA0O, CT1JTQ, G8JNJ/A, G3ZJG.

Many thanks Dan for these interesting data.
73, Patrick