Strangely narrow SID on 26/1/2026 associated with C-class flare:
From Lichfield Radio Observatory (my observatory in UK):
Compare to SID Monitoring Station (https://sidstation.loudet.org/data-en.xhtml) – an excellent source of high quality data which I use to compare my data with:
Shows same flare – also means there is problem with my time stamp on my MiniPC running the UKRAA SID monitor at LRO at time out by about an hour – I’ll have to look into that.
Andy
Response from Andrew Thomas:
There was a C1.8 flare at 12:20 peaking at 12:40 and ending at 12:40. I saw the same short SID, it is surprisingly deep for a C class flare.
Hi, that was short switching off of DHO38 transmitter. See https://ok1dub.cz/vlf/one_day_pattern_2026.php?pocatecni_den_ve_vypisu=25 and https://ok1dub.cz/vlf/plot/vlf_ok1dub_plot_2026_01_26_1300_utc.png and https://ok1dub.cz/vlf/spectrum/vlf_ok1dub_2026_01_26_1300_utc.png
It is very usefull to observe also spectrogram.
Regards, Mirek
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FROM Miroslav Najman:
https://www.astronomy.me.uk/strangely-narrow-sid-on-26-1-2026-around-midday
Hi, that was short switching off of DHO38 transmitter.
See:
https://ok1dub.cz/vlf/one_day_pattern_2026.php?pocatecni_den_ve_vypisu=25
https://ok1dub.cz/vlf/plot/vlf_ok1dub_plot_2026_01_26_1300_utc.png
https://ok1dub.cz/vlf/spectrum/vlf_ok1dub_2026_01_26_1300_utc.png
It is very useful to observe also spectrogram.
Regards, Mirek
FROM Mark Edwards:
Hi Andrew,
Looks like one of 23.4kHz frequent transmitter dropouts to me as it
doesn’t show up on any other frequencies I monitor = 21.75kHz, 22.1kHz, 37.5kHz, and 19.6kHz.
Mark