so a few weeks ago i worked Japan on 17 meters which was honestly kind of surreal, i wasnt even trying i just had the radio on and heard a JA station calling CQ and figured what the heck. got him on the second call which surprised me. but ever since then ive been on at similar times and the band just sounds like a empty room, maybe some static and the occasional carrier but nothing like that morning.

i've been checking pskreporter and seeing some spots but nothing near me is decoding anything from that direction. my setup hasnt changed at all, still running the same dipole and about 100 watts. is this just normal variation or is something happening with the sun? i've heard about solar flux but honestly i dont fully understand how to use that info to know when to even bother trying.

yeah what you experienced was almost certainly a short opening, those can be really fleeting especially on 17. the solar flux index is kind of your starting point for figuring out if HF is worth bothering with on a given day — higher numbers generally mean better propagation on the higher bands, anything above like 120 or so and 10, 12, 15 start waking up, below 80 and youre really down to 40 and 80 for reliable stuff with 20 somewhere in the middle depending.

but honestly SFI alone doesnt tell the whole story. you also want to watch the K index — that one tells you about geomagnetic activity. a high K index even on a decent solar flux day can wipe out a band opening completely. when the K is 4 or above i usually dont even bother trying for DX, just end up frustrating myself. there are sites like hamqsl or dxmaps that aggregate all this in one place. once you start watching those numbers daily it kind of clicks after a while.

im in almost the same situation lol, worked a VK last month on 15 and have barely heard anything exotic since. kind of wondering if i just got lucky with timing. gonna go check that dxmaps site the other guy mentioned, never heard of it