Hi Alan, the morning light shining from underneath is an intruiging notion, and I've been wondering about it since you first mentioned it a while ago. To me, one conceptual problem seems to be that t
GM to all. The same strange propagation tonight as every night. At around 03.00z my signal disappear from DF6NM, DK7FC, YO/4X1RF & G4WGT grabbers. I have better prop earlier and during the day with d
Hi Spiros, not really strange: the rising sun is suddenly ionizing lower ionospheric layers and increasing the absorption. Here's a somewhat simplistic explanation of diurnal propagation: At night, L
Hi Markus the incident radiation has a wide band of wavelengths .....the reference is a QST article(Dec 1999) by Bob Brown NM7M (Dean of Physics at Berkley)I have a copy somewhere in a QST CD. Yes an
Hi Markus, Spiros, there is another interesting effect at dawn. The weak rays of the rising sun actually strike the ionoshere first from underneath !! this means that the first photodissociated ionis
Hi All, things are beginning to look up a bit I think. The Kp index is still hovering in the 4s but the NOAA site predicts quiet conditions. The Dst has reached -38 but should rise towards zero by th
Hi all, although there is not a lot of activity at the moment I though there might be some interest in conditions approaching the time of Laurence's jaunt to the Pacific. Geomagnetic activity is low
Hello all, For those in Europe who want to know where the lightning storms are concentrated I can recommend http://129.13.102.67/pics/Rsfloc.gif Brian and I have consulted this site regularly for a y