Another slow start turned into a pretty good night of WSPR reports after 0500z. Storms peppered the southern and southwestern US and made listening a challenge during the early evening. Precipitation noise from an on-going snow storm was reported in the Midwest. Even with these challenges the band was open and allowing reports, many of which were two-way communication quality.
Geomagnetic conditions have returned to quiet levels, with a North-pointing Bz and solar wind velocities in the low category.
Ken, K5DNL / WG2XXM, reports that he decoded eight WSPR stations and was decoded by 34 unique stations including VK2DDI and VK4YB.
Phil, VE3CIQ, reports that he decoded WH2XGP on the transcontinental path at his sunrise in VE3.
Neil, W0YSE/7 / WG2XSV, reports that he decoded five WSPR stations and was decoded by ten unique stations with 45 reports for WH2XCR, best at -12 dB S/N.
Doug, K4LY / WH2XZO, performed some antenna work yesterday and reports the following from the day and overnight session:
Larry, W7IUV / WH2XGP, reports that he decoded six WSPR stations and was decoded by thirty unique stations including VK2XGJ.
Ken, SWL/EN61, in Indiana, sent this link about noise suppression.
Mike, WA3TTS, observed variations in his reporting times of WH2XCR compared to WG2XJM. This propagation behavior has always fascinated me. Mike includes his statistics and comments below:
New or newer WSPR stations observed receiving include WB3FTQ and KC3BKT. Welcome aboard!
Regional and continental WSPR breakdowns follow:
There were no trans-Atlantic or trans-African reports during this session. UA0SNV was present from Asiatic Russia but no reports were found in the WSPRnet database.
Eden, ZF1EJ, reported a number of stations around North America in addition to WH2XCR in Hawaii.
In Alaska, Laurence, KL7L / WE2XPQ, continues to make a valiant effort in spite of the charged-up electron reservoirs from the recent solar wind event.
In Hawaii, Merv, K9FD/KH6 / WH2XCR, experienced a great session with numerous reports from Japan and Australia, including reports from new WSPR station ‘JF1LKS’. Merv notes that VK3ELV and VK4YB were present right up to 1500z but upload problems prevented those reports from being seen in the WSPRnet database.
In Australia, Phil, VK3ELV, and Roger, VK4YB, both were reported by WH2XCR. Phil received additional reports from Japan during the session, including new WSPR station ‘JF1LKS’.
Jim, W5EST, presents part 3 in his series entitled,”SLIDING WINDOW APPROACH TO 2015-2016 TA SEASON”:
“Today’s graphical inset “630m TP” portrays 630m nightly numbers of spots for the 2015-2016 WSPR season both ways between North America and Australia. Transmitting and receiving stations have demonstrated that 630m spans these two continents in late summer and early fall, and even in late winter and early spring this year!
As you will recall from this blog April 6 and 8, such long path seasonality is reflected in
activity-oriented reception counts. Every decode of the same TX regardless of TxPct–even if obtained at different RX stations in the same timeslot–accumulates a night’s count.
I’ve overlaid the 630m TP graph in the upper middle of the 630m TA graph from yesterday. Dates are aligned and scales of the axes are matched. You can compare and contrast TA and TP with your own eyes.
630m TP differs from 630m TA in several ways: TP has two mini-seasons. TP has more than twice the path length of TA. Seasonal peaks in TP spot numbers do not correlate timewise with 630m peaks in TA spot numbers. Geographically, TP is trans-equatorial across the Pacific Ocean while TA transits the North Atlantic at high latitudes.
Nevertheless, 630m TP and 630m TA have some similarities. Both their seasons can start as early as August and end sometime in N. American spring. (Last fall in 2015, TA just had an unusually late start. On 8/17/2014 WG2XKA did TA into GM4SLV, for instance.)
Both TA and TP have their good nights, but their seasons feature significant dry spells in between. The dry spells partly result from the WSPR decoder’s threshold, partly from storms, and partly from impaired propagation.
Appended see a Date Table of Lunar Phases. You can see that this season’s TA peaks align well with the moon’s third quarter for several months, but 2016’s January and early March peaks don’t fit the pattern. A lunar explanation is not particularly compelling. If the third quarter is a tidal minimum and quiets the ionosphere, why wouldn’t the first quarter be equally fertile for TA?
I doubt that the sun’s rotational period would fit the TA peaks any better than some lunar phase does. However sunspots, particle emissions and coronal dynamics modulate the space weather in Earth’s vicinity that affects the ionosphere and generates aurora. So the sun’s rotational period is not the whole story. Tell us your words of wisdom!
Other 630m long paths have generated many decodes in the last several months–VK-JA, HI/Alaska-JA, EU-FR5 (Reunion Island), and HI-to-E.USA. Time permitting, I hope to generate their seasonal illustrations for future blog posts.
Satisfactory prediction of 630m long path success escapes us for now. It’s as fun to enjoy the mystery of the occasional successes just as much as it is tantalizing when opportunities fail to materialize even on storm free nights of quiet space weather and GMF conditions!”
Lunar synodic period 29.530589 days https://en.wikipedia.org/wiki/Moon
Solar Carrington period 27.2753 days https://en.wikipedia.org/wiki/Solar_rotation
Additions, corrections, clarifications, etc? Send me a message on the Contact page or directly to KB5NJD <at> gmail dot (com)!