Re: [IRCA] Tonight

["Thomas Giella KN4LF" <flcyclone@xxxxxxxxxxxxxxx>]

Also the background x-ray solar flux is A9.7 and the Dst index is a -4, which are more reliable indicators of good MF propagation band conditions than the Ap and Kp indices.

 

 

Here are some general guidelines concerning correlation of MF propagation indices to actual expected propagation conditions.

1.) Dropping indices numbers are better.

2.) For medium frequencies a solar flux under 150, under 100 better, 70 is best for E layer multi hop.

Keep in mind though that the 10.7 cm (2800 mhz) solar flux index is not a "reliable" gauge of ionization in our atmosphere for F layer MF frequency refractions, as the energy of photons at this frequency is to low on the order of one million times. However most are used to solar flux and sunspot number and it's a hard habit to break. A better indicator is the background x-ray flux. See #7 below.

3.) Solar flux of at least 100 for E valley-F layer ducting mechanism.

4.) Previous 24 hour Ap index under 10, under 7 for several days consecutively is best.

5.) Previous 3 hour Kp index under 3 for mid latitude paths, under 2 for high latitude paths, 0-1 for several days consecutively is best.

6.) Energetic protons no greater then 10 MeV (10+0) for 160/120 meters and no greater then (10-1) on MF broadcast band.

7.) Background x-ray flux levels less than C1 for several days consecutively for 160/120 meters and less then B9 for MF broadcast band, A9 or less is best.

8.) No current STRATWARM alert.

9.) IMF Bz with a (positive number) sign, indicates a lesser chance of high latitude path auroral absorption/unpredictable refraction or scattering of MF RF signals, when the Kp is above 3.

10.) A -50 or better towards a positive number Dst index during the recovery time after a geomagnetic storm, as related to the Equatorial Ring Current.

----- Original Message -----

From: Torus34@xxxxxxx

To: irca@xxxxxxxxxxxxxxxx

Sent: Wednesday, September 21, 2005 6:39 PM

Subject: [IRCA] Tonight

A=3!  K=0!

 

Grey line approaching at 1000 mph!

 

Tonight's the night to put on the cans.

 

Jim Hannah

10307

Sangean 818, barefoot

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