Day-to-Day Variability of the Ionosphere

Is the Ionosphere In Step

NM7M The Little Pistol's Guide to HF Propagation

This is a 15 Megabyte file, so be advised that it may take a while if you have a slow connection. Thanks to NM7M’s daughters and son for giving me permission to put this on my web site.

Where Do the K and A Indices Come From

Noise

The Formation of the Ionosphere

Polarization

Disturbances to Propagation

A Look Inside the Auroral Zone

Propagation Plannning for DXpeditions

Measuring the Ionosphere

NM7M Contributions to Propagation