DX analysis of FT8 contacts

It's one of my interests to analyse why and how contacts can made possible on a specified band.

This weekend I worked a YC6 at 19h UTC.  It was before sunset on my side and before sunrise in Indonesia.  So this contact is a surprise for me.  We exchanged -16dBm and -15dBm.

At 22h UTC I worked another YB.  This time we were both in the twilight zone.  In accordance with the expectations on 80m.  We exchanged -24dBm and -16dBm.

Same graph for the USA contacts.  Although the West coast was in also in the twilight zone around 3h UTC, nobody came back to my call.  I suspect the G5RV in this case.  To be continued