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.