so ive been trying to work some DX on 17m and 15m this past week and honestly the conditions have just been all over the place. some days the solar flux is up around 160 and i can hear europe clear as a bell around 1400-1500 UTC, then the next day its back down to like 130 and everything goes quiet. checked the DXmaps and theres activity showing but i cant hear squat.

had a really weird thing happen tuesday where i worked a JA station on 15m with my 100w and a dipole, which felt like a miracle honestly, and then literally 20 minutes later the band just died. like hard cutoff. wasnt a gray line thing either, at least i dont think so. K index was low so i wouldnt expect a geomagnetic thing. just curious if anyone else is seeing this kind of behavior or if its something on my end. antenna has been checked, no issues there.

also noticed 10m has been teasing me. it opens up for maybe an hour sometimes in the afternoon to south america and then poof. is this just what solar cycle 25 looks like right now or am i missing something about how to predict these short openings better

yeah 15m has been doing exactly that here too, im in the midwest so maybe similar path geometry to yours. the thing about solar flux is it doesnt tell the whole story — you can have decent SFI but if theres even minor geomagnetic activity or a high-speed solar wind stream that didnt make the news it can just kill the higher bands fast. i usually keep an eye on the Kp forecast on spaceweather.com and also the NOAA 3-day outlook because sometimes there are coronal hole effects that dont show up in the SFI number at all.

the JA opening you described sounds like a classic short-path peak. those can be sharp, especially on 15m when conditions are marginal — the path lights up, the MUF just barely supports it, and then it collapses. nothing wrong with your setup, thats just propagation being propagation. honestly working a JA with 100w and a dipole on a middling flux day is pretty solid, dont overthink it.

10m to south america in the afternoon is almost certainly TEP or a mix of F2 and TEP depending on your latitude. those can be very short windows. if you want to catch them more reliably try tuning up around 28.400-28.500 a bit before your local noon and just listen. FT8 on 10m will also show you when the band is barely cracked open even when SSB wouldnt be workable.

omg yes i thought it was just me being a new ham and not knowing what im doing lol. i got my general back in march and ive been trying to figure out propagation ever since and it feels like every time i think i understand it something weird happens. someone in my club told me to just watch the DX cluster and jump on anything i see but half the time by the time i find the frequency its gone already. still learning i guess