Greyline propagation - good times again on HF

Steve Nichols, G0KYA, of the RSGB's Propagation Studies Committee, reminds us that we are now heading towards good greyline propagation time again on the lower HF bands.

As the equinox approaches we should see good dawn and dusk propagation on 80 and 40 metres. Topband may also yield good dawn / dusk contacts. For example, Steve says that on 10 September YV5 and YY1 stations in Venezuela were romping in at 0538UTC on 40 metres - easily 59 on a low dipole.

If you plot this in Geoclock or a similar program you will see that this is a greyline contact at right angles across the terminator into the night zone. Many ZLs (New Zealand) have also already been spotted on 40m in the mornings.

Applying the theory, we could see the Far East, India, Australia and perhaps New Zealand at dusk around 1830UTC. In the morning at around 0530UTC we may also hear the Caribbean, South America and the southern States, although do bear in mind that it is the very early hours of the morning in these areas.

For more information about Greyline you can e-mail Steve at g0kya@qsl.net

Source: GB2RS News - Courtesy of the RSGB

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