- + FCC News: New Rules for 5 MHz (60 Meters) To Go Into Effect March 5
- + WRC-12: Agenda Item 1.23 Passes Committee, Moves to Plenary
- + WRC-12: How Are Agenda Items Processed at a WRC?
- + WRC-12: Proposed Maritime Mobile Allocation Gets First Reading at WRC-12 Plenary Session
- + WRC-12: Nobel Laureate Joe Taylor, K1JT, Addresses Plenary Session at WRC-12, Receives ITU Gold Medal
- On the Air: The 2012 ARRL International DX CW Contest Takes to the Air Next Weekend
- ARRL HQ: Save the Date! Take a Virtual Tour of W1AW on February 12
- + ARRL Field Day: 2012 Field Day Packet Now Available
- Solar Update
- This Week in Radiosport
- Be a Star! Deadline for Second Annual ARRL Video Contest is February 29
- + Silent Key: Former ITU-R Director Dick Kirby, W0LCT/HB9BOA (SK)
- + Silent Key: Astronaut Janice Voss, KC5BTK (SK)
- Silent Key: WorldRadio Founder Armond Noble, N6WR (SK)
- Upcoming ARRL Section, State and Division Conventions and Events
Thursday, February 9, 2012
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.
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