Question 1

Why are the HF bands dead today?

Accepted Answer

HF bands often sound dead when space weather reduces ionization or increases absorption. Today’s quick check: Kp 0.67, X-ray B7.2, SFI 103. High Kp can disrupt polar paths; strong flares can cause shortwave blackouts.

Question 2

What K-index usually hurts HF propagation?

Accepted Answer

Kp 4+ commonly degrades HF (especially high-latitude paths), and Kp 6+ can cause widespread disturbances. Lower bands may still work while 10m/15m collapse.

Question 3

Do solar flares make the bands go dead?

Accepted Answer

Yes—M and X-class flares can create sudden shortwave blackouts on the sunlit side of Earth (D-layer absorption). If X-ray is elevated, expect temporary HF loss until the flare impact fades.

Why are HF Bands Dead Today?