05-05-2023, 08:19 PM
The 'regular' E layer only works to 25Mhz. So if you hear shortskip at higher frequencies
you know it is propagation by the Es layer. The height in the E layer at which a MS reflection
occurs depends on the speed of the meteor (since showers have different speeds, some are good
for longer distances, some for shorter distances).
Es means two things; the layer of ionosphere or a propagation by means unknown via the Es layer.
So while MS involves the Es layer, it is NOT Es propagation since the means of propagation is
known (the extra ionization required to allow the E layer to function above 25Mhz came from the
meteor).
Years ago, this 'propagation by something at E layer height by means unknown' was called 'SpE'.
A current identification* of Es (propagation) might be 'very strong constant signals lasting over
10 minutes'.
Perhaps your question involves the duration of bursts? This could be overdense/underdense
(differences in signal strength, keep agc off or the difference seen on waterfall). Or the
direction and duration of trail. Or the difference in lengths of nighttime/daytime bursts.
I hope to read your explantion of what you observed...
'agx
*And more recently, as noted on cluster, Es means a dx contact made by digital burst
you know it is propagation by the Es layer. The height in the E layer at which a MS reflection
occurs depends on the speed of the meteor (since showers have different speeds, some are good
for longer distances, some for shorter distances).
Es means two things; the layer of ionosphere or a propagation by means unknown via the Es layer.
So while MS involves the Es layer, it is NOT Es propagation since the means of propagation is
known (the extra ionization required to allow the E layer to function above 25Mhz came from the
meteor).
Years ago, this 'propagation by something at E layer height by means unknown' was called 'SpE'.
A current identification* of Es (propagation) might be 'very strong constant signals lasting over
10 minutes'.
Perhaps your question involves the duration of bursts? This could be overdense/underdense
(differences in signal strength, keep agc off or the difference seen on waterfall). Or the
direction and duration of trail. Or the difference in lengths of nighttime/daytime bursts.
I hope to read your explantion of what you observed...
'agx
*And more recently, as noted on cluster, Es means a dx contact made by digital burst