Name That Core

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. A special thanks to NM7M’s daughters and son for giving me permission to put this (and Bob’s other books) on my web site.

NM7M Long Path Propagation     This is a 3 Megabyte file.

NM7M Long Path Propagation - Revisited     This is a 19 Megabyte file.

NM7M On Ion Chemistry and Propagation

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

Did We Lose a Solar Cycle

Old Sunspot Data