K index — How disturbed the earth's magnetic field is.
Zero to nine. Under 3 is quiet and good. Five and above means a geomagnetic storm is degrading HF, especially on paths toward the poles.
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Related words
- Wavelength — The physical length of one radio wave.
- Gray line — The band of twilight moving around the earth.
- Solar flux — A number that tracks solar activity.
- Band — A range of frequencies set aside for a purpose.
- FT8 — A weak-signal digital mode.
- Frequency — How fast a radio wave oscillates.
- CW — Continuous Wave. Morse code.
- Sporadic E — Sudden short-lived openings.