tag:blogger.com,1999:blog-5480750694693825336.post3203350405586504640..comments2024-03-21T00:59:58.137-07:00Comments on G0KYA's Amateur Radio Blog: Sporadic E season is under waySteve Nicholshttp://www.blogger.com/profile/03564402221894277279noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-5480750694693825336.post-52671441511644399312016-05-20T05:54:53.778-07:002016-05-20T05:54:53.778-07:00I believe that noctilucent clouds have been linked...I believe that noctilucent clouds have been linked to Summer Solstice Short Path (SSSP) propagation between Japan and Europe on 50MHz . When I first suggested this as a possibility I was shouted down, but I understand that reflections have been seen using a 46.5-MHz radar system at Aberystwyth in Wales.Steve Nicholshttps://www.blogger.com/profile/03564402221894277279noreply@blogger.comtag:blogger.com,1999:blog-5480750694693825336.post-7038838785191731212016-05-20T05:36:53.264-07:002016-05-20T05:36:53.264-07:00Winter appearances of Polar Mesospheric (non-summe...Winter appearances of Polar Mesospheric (non-summer) Echoes are shown now to be almost certainly down to meteoric input. The non-summer echoes are related, to varying degrees, to the appearance of Es in winter. As you imply, the situation is quite complicated, made more so by the inaccessibility of that height in the atmosphere.<br /><br />It's useful to look at photos of noctilucent clouds, which are also nucleated around iced, charged meteor debris in summer. These reveal the gravity wave structures visually, which are essentially identical to what is going on with Es clouds.Photonhttps://www.blogger.com/profile/10137649851898638015noreply@blogger.com