HF-band conditions (day/night)
These are the values I calculated from the raw NOAA data. There isn’t any golden rule for calculation propagation conditions. I’ve put together an algorithm based on data from different sources. As a rule of thumb, values below 40 are considered poor, between 41 and 89 fair and above 89 good.
Paul Herrman (N0NBH) has a fantastic site if you’re into solar and weather data. I’ve used his info a lot.
| Band | Day | Night |
|---|---|---|
| 160m | Good (393) | Good (555) |
| 80m | Good (205) | Good (273) |
| 60m | Good (142) | Good (178) |
| 40m | Good (131) | Good (162) |
| 30m | Good (94) | Good (106) |
| 20m | Fair (61) | Fair (59) |
| 17m | Fair (44) | Poor (38) |
| 15m | Poor (40) | Poor (33) |
| 12m | Poor (28) | Poor (20) |
| 10m | Poor (24) | Poor (14) |
PD2RKG alias Jeepie 