0 How To Read Propagation Numbers

How To Read Propagation Numbers

The A index [ LOW is GOOD ]

1 to 6 is BEST

7 to 9 is OK

11 or more is BAD

Represents the overall geomagnetic condition of the ionosphere ("Ap" if averaged from

the Kp-Index) (an average of the eight 3-hour K-Indices) ('A' referring to amplitude) over a

given 24 hour period, ranging (linearly) typically from 1-100 but theoretically up to 400.

A lower A-Index generally suggests better propagation on the 10, 12, 15, 17, & 20

Meter Bands; a low & steady Ap-Index generally suggest good propagation on the

30, 40, 60, 80, & 160 Meter Bands.

SFI index [ HIGH is GOOD ]

70 NOT GOOD

80 GOOD

90 BETTER

100+ BEST

The measure of total radio emissions from the sun at 10.7cm (2800 MHz), on a scale of

60 (no sunspots) to 300, generally corresponding to the sunspot level, but being too low

in energy to cause ionization, not related to the ionization level of the Ionosphere.

Higher Solar Flux generally suggests better propagation on the 10, 12, 15, 17, & 20

Meter Bands; Solar Flux rarely affects the 30, 40, 60, 80, & 160 Meter Bands.

K index [ LOW is GOOD ]

0 or 1 is BEST

2 is OK

3 or more is BAD

5 is VERY VERY BAD

The overall geomagnetic condition of the ionosphere ("Kp" if averaged over the planet)

over the past 3 hours, measured by 13 magnetometers between 46 & 63 degrees of

latitude, and ranging quasi-logarithmically from 0-9. Designed to detect solar particle

radiation by its magnetic effect. A higher K-index generally means worse HF conditions.

A lower K-Index generally suggests better propagation on the 10, 12, 15, 17, & 20

Meter Bands;

a low & steady Kp-Index generally suggest good propagation on the 30, 40, 60, 80,

& 160 Meter Bands.