The band was reported to be improved but not great during this session which is probably a fair assessment after additional geomagnetic storming. Daytime reports during this session were poor at my station and ended prior to 1600z only to return near 2300z. Also observed is the later opening of the band but this is tied to daylight savings time and unreasonable expectations for the band as the days get longer. The openings should occur but they may be shorter in duration and occur later. As expected higher latitudes should suffer most, just as they do when the band is unsettled.
The geomagnetic field was at storm levels. The Bz was southerly and the solar wind velocity exceeded 500 km/s, peaking above 600 km/s in a few instances. Protons number were elevated as well. Spaceweather.com is reporting a “co-rotating interaction region” as the cause of the most recent auroral activity.
John, WA3ETD / WG2XKA, once again was reported in Germany by four stations. Clemens, DL4RAJ, responded to an information request about the differences between his two stations. Details are posted below the session report that John provided for his station in Vermont.
Doug, K4LY / WH2XZO, experienced some activity before his sunset and provided these details:
Joseph, NU6O / WI2XBQ, reported that North / South propagation dominated at 0439z with East / West propagation restored by 0530z.
Ken, K5DNL / WG2XXM reported that he decoded twelve WSPR stations and was decoded by 39 unique stations during this session. Like several stations, Ken noted elevated noise levels during the evening, presumably due to Midwestern storms.
Larry, W7IUV / WH2XGP, reported that he decoded ten WSPR stations and was decoded by 32 unique stations during the session. Larry also notes that the band was not great but it was better than it has been.
WSPR participation numbers were healthy for this session with 72 MF WSPR stations observed at 0130z. Regional and continental WSPR breakdown’s follow:
There were no reports from the trans-African path, however, ZS1JEN was present during this session. UA0SNV was also present but no reports were found in the WSPRnet database.
As previously mentioned, WG2XKA was reported by four stations in Germany for the sole trans-Atlantic reports for the session.
From the Canary Islands, EA8/DL9XJ reported DH5RAE and F6GEX while EA8/LA3JJ reported G0MRF/p. Were the variations the result of local noise or did the propagation actually differ so significantly that the reports followed suit?
Eden, ZF1EJ, reported most of the stations that were QRV during this session in North America. Eden indicated in the ON4KST chat/logger that he received WH2XCR three times on a different radio that was not set for upload. The antenna used was the large Log Periodic Array.
In Alaska, Laurence, KL7L / WE2XPQ, experienced a typical night, with reported along the western coast of North America and WH2XCR in Hawaii. Absorption from recent aurora is no doubt taking its toll. Its nice to see reports on high latitude paths in spite of the hardships.
In Hawaii, Merv, K9FD/KH6 / WH2XCR, was able to take advantage of better band conditions at lower, tropical latitudes and receive numerous reports from stations in the eastern US like WG2XJM and WH2XZO. The path to Australia has been restored with reports for Phil, VK3ELV, during this session and two-way reports for Roger, VK4YB. The path the JA remains closed but Merv has some thoughts on that as well as other comments for the session:
Jim, W5EST, sent me a fascinating message about today’s discussion point a few days ago that I am still thinking about. I look forward to hearing others thoughts about this one:
As this blog reported, Sunday evening in Arkansas abounded with thunderstorm activity!
the accompanying screenshot of the W5EST G33DDC RX waterfall shows lightning 50-60dB over noise. An inset, upper right, shows those Arkansas storms on Doppler radar.
The waterfall display stretches a 600 Hertz band of 630m frequencies with nominal 1 Hertz resolution horizontally across the screen. This screenshot froze the action that occurred in a 33 second time interval.
Each lightning strike spreads out as one horizontal line. Strikes were coming fast—about one each second at 0052z.
See how segmented some of those horizontal lines are! Like dashed lines. Not all of them, just some of them. Why is that? The segments of some of those lines repeat with different numbers of segments in each 100 Hertz division of the waterfall horizontally. The segmented lines appear to have about 5-10 segments per100 Hertz, depending on which line.
Is this segmentation the result of some kind of self-interference of parts of the lightning strike with itself? I don’t think it is an artifact of the display process or spectrum generating software, because the horizontal lightning lines differ so much.
The segmentation could be important because it means that on 630m, the frequencies lying in 5-10Hz spaces between the segments in any one horizontal lightning line have less noise than most other frequencies. Could we take advantage of that feature somehow, even if it would be challenging?
What do you think about the self-interference question, etc? Do you have any lightning waterfall screenshots of your own? Let us know if we can blogpost anything you might offer. Thanks & GL.”
Additions, corrections, clarifications, etc? Send me a message on the Contact page or directly to KB5NJD <at> gmail dot (com)!