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[Propagation] Critical vs. Maximum Usable Frequency map

To: propagation <>
Subject: [Propagation] Critical vs. Maximum Usable Frequency map
From: "NW7US, Tomas" <>
Date: Sun, 26 Sep 2004 12:23:02 -0700
List-post: <>
On Sun, 26 Sep 2004 06:09:16 -0000, David Ackrill <> wrote:

If you want the local F2 Critical frequency (the one where signals go almost straight up and down, try looking at this map.

Excellent map for this.

Also of interest are the "live" (using real measurements) HAP maps from IPS:

North America HAP maps:

North America Ionospheric map:

The best jump off point for IPS HF-related data is:

These HAP maps are "Hourly Area Predictions" of communication frequencies based on current observed conditions in the North America ionosphere. Because of the variability of the ionosphere this type of prediction can only be made for the current hour.

For paths that are more typical of "DX" (3000 km paths), there is also this map:

73 de Tomas, NW7US (AARØJA/AAAØWA)

: Propagation Editor for CQ, CQ VHF, and Popular Communications :
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