[IRCA] MF Radio Wave Propagation Condition General Guidelines
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[IRCA] MF Radio Wave Propagation Condition General Guidelines

5A.) GENERAL GUIDELINES CONCERNING CORRELATION OF PROPAGATION INDICES TO ACTUAL MF PROPAGATION CONDITIONS-
NOTE!!! The propagation indices "interpretations" are my personal intellectual property. Therefore the radio wave propagation indices interpretations contained herein is copyrighted © 1988-2012 by Thomas F. Giella, NZ4O, all rights reserved. Reproduction of information herein is allowed without permission in advance as long as proper credit is given. 

1.) Dropping geomagnetic field indices numbers are better, Kp of 0 best.

2.) A daily sunspot number under 100, under 70 best.
3.) A daily sunspot number no higher then the 100 for routine stable formation of the E Valley/F Layer ducting mechanism.
4.) Previous 24 hour Ap index under 10, fewer than 7 for several days consecutively are best.
5.) Previous 3 hours Kp index fewer than 3 for mid latitude paths, fewer than 2 for high latitude paths, 0 for several days consecutively is best. 

6.) Energetic protons no greater than 10 MeV (10+0).

7.) Background x-ray flux levels of A0 for several days consecutively.

8.) No current STRATWARM alert.
9.) Interplanetary magnetic field (IMF) Bz with a (positive number) sign, indicates a lesser chance of high latitude path aurora absorption/unpredictable refraction or scattering of medium frequency RF signals, when the Kp is above 3.
10.) A -20 or better towards a positive number Dst index during the recovery time after a geomagnetic storm, as related to the equatorial ring current. A positive number is best.
11.) Galactic cosmic rays decrease to -10 units below zero and trending towards zero.
73 & GUD DX, Thomas F. Giella, NZ4O 
Lakeland, FL, USA
nz4o@xxxxxxxxxxxxxxx

NZ4O Amateur & SWL Radio Autobiography: http://www.nz4o.com
NZ4O Daily MF/HF/6M Radio Wave Propagation Forecast: http://www.solarcycle24.org NZ4O Daily Solar Space Weather & Geomagnetic Data Archive: http://www.wcflunatall.com/nz4o1.htm NZ4O Solar Space Weather & Geomagnetic Data Dashboard: http://www.wcflunatall.com/nz4o2.htm NZ4O Solar Cycle 24 Forecast Discussion & Archive: http://www.wcflunatall.com/nz4o4.htm NZ4O 160 Meter (MF) Radio Propagation Theory Notes: http://www.wcflunatall.com/nz4o5.htm NZ4O Solar Space Weather & Geomagnetic Raw Forecast Data Links: http://www.wcflunatall.com/nz4o6.htm Solar Cycle 24 dot org on Facebook: http://www.facebook.com/pages/SolarCycle24org/139198369462931 



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