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Tom DF5JL @tomdf5jl.bsky.social · 4h

HF #Propagation Report - We have an ongoing strong geomagnetic activity G4/Kp8+, high solar activity (X5.1 11/1004 UTC) and an S2-S3 proton storm. The risk of further solar flares is significantly increased (M 85% X 55% Proton 99%). Disturbed HF propagation. #spaceweather #hamradio #hamr

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Tom DF5JL @tomdf5jl.bsky.social · 20h

NOAA model simulations show that the CME from November 9 is expected to arrive tonight. #spaceweather #hamradio #hamr

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Tom DF5JL @tomdf5jl.bsky.social · 1d

HF #Propagation Report - Initially, mainly quiet to unsettled geomagnetic activity is expected. The CME from NOV 9 is expected to arrive late on November 11, with G1-G2 storms. The risk of further solar flares (M and X) is increased (M 75%, X 35%, Proton 99%). #spaceweather #hamradio #hamr

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Tom DF5JL @tomdf5jl.bsky.social · 2d

HF #Propagation Report - Geomagnetic activity is expected to be mostly calm to active today, but stormy phases are possible due to CME effects. The sun is only moderately active, but there is a possibility for further stronger flares (M 70% X 25% proton 25%). #spaceweather #hamradio #hamr

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Tom DF5JL @tomdf5jl.bsky.social · 3d

X1.8 @0735UT R3 Radio Blackout, Indian Ocean #spaceweather #hamradio #hamr

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Tom DF5JL @tomdf5jl.bsky.social · 3d

At that very moment, space weather observers register an X-class solar flare. Reports to follow. #spaceweather #hamradio #hamr

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Tom DF5JL @tomdf5jl.bsky.social · 4d

HF #Propagation Report - Further storms of strength G1 to G2 are expected, with isolated strong G3 or G4 storms. The sun has been moderately active over the past 24 hours. Isolated M-flares expected, as well as a strong X-flare in AR4274 (M 80% X 35% proton 20%). #spaceweather #hamradio #hamr

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Tom DF5JL @tomdf5jl.bsky.social · 4d

foF2/foEs/MUF100/500/1000/3000 today in Dourbes (Belgium). HF #propagation is getting better :) #spaceweather #hamradio #hamr (credit: propquest.co.uk)

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Tom DF5JL @tomdf5jl.bsky.social · 5d

HF #Propagation Report - Together with CME effects, geomagnetic storms (G1-G3 / Kp5-7) are still to be expected today. Further CME arrivals are likely today. HF propagation is disturbed. Solar activity is expected to remain moderate to high (M 80% X 35% Proton 20%). #spaceweather #hamradio #hamr

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Tom DF5JL @tomdf5jl.bsky.social · 5d

This is what happens during a magnetic storm;
The MUF3000 only reaches 50% of the previous day's values. #spaceweather #hamradio #hamr

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Tom DF5JL @tomdf5jl.bsky.social · 6d

The risk assessment for M and X flares and proton storms has been raised by NOAA: M 80%, X 35%, Proton 35%. (6 NOV 2025 0503UT) #spaceweather #hamradio #hamr

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Tom DF5JL @tomdf5jl.bsky.social · 6d

Incoming CMEs are shaking up the Earth's magnetic field, and coronal hole CH94/- is slowly rotating into a geoeffective position. Space weather observers now expect the magnetic storm phase to continue through Saturday. This also applies to G3 warnings! Credit SWPC/NOAA #spaceweather #hamradio #hamr

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Tom DF5JL @tomdf5jl.bsky.social · 6d

HF #Propagation Report - A strong geomagnetic storm (G3/K=7) is underway. Further CMEs are expected during this morning. Solar activity is expected to be moderate to high, with occasional M-flares and possibly an isolated X-flare. Poor condx today and tomorrow #spaceweather #hamradio #hamr

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Tom DF5JL @tomdf5jl.bsky.social · 7d

HF #Propagation Report - Solar activity surprised with two X-class flares, max. X1.8 at 04/1734 UTC. Moderate activity is expected today (M 65% X 10% Proton 10%) with the possibility of further isolated X-flares. Geomagnetic activity is quiet to active (Kp2-4). #spaceweather #hamradio #hamr

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Tom DF5JL @tomdf5jl.bsky.social · 8d

HF #Propagation Report - Solar winds are slightly elevated, and geomagnetic activity is expected to remain quiet to unsettled (Kp2-3). Solar activity is now at a moderate level (M5 03/1011UT). Further isolated M flares are to be expected (M 55% X 10% Proton 01%). #spaceweather #hamradio #hamr

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Tom DF5JL @tomdf5jl.bsky.social · 9d

HF #Propagation Report - Geomagnetic activity is expected to be predominantly quiet to unsettled (Kp2-3). Stormy phases cannot be ruled out. Moderate solar activity is expected, with the possibility of isolated M-flares (M 25% X 05% Proton 01%). #spaceweather #hamradio hamr

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Tom DF5JL @tomdf5jl.bsky.social · 11d

HF #Propagation Report - Solar wind speeds remain elevated, but slowly decreasing. Geomagnetic activity is expected to be unsettled to active (Kp3-4), with the possibility of stormy periods due to coronal wind and CMEs. Solar activity remains low (M15% X01% Proton01%). #spaceweather #hamradio #hamr

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Tom DF5JL @tomdf5jl.bsky.social · 11d

Happy Halloween! On October 8, 2014, active regions on the sun formed something that looked like the face of a jack-o'-lantern. Source: NASA. #spaceweather #hamradio #hamr

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Tom DF5JL @tomdf5jl.bsky.social · 12d

HF #Propagation Report - Solar winds from coronal holes are currently reaching peak speeds of ~700 km/s. As a result, geomagnetic activity is active to stormy (Kp 4-5). This is affecting shortwave propagation. Solar activity remains low (M 05%, X 01%, proton 01%). #spaceweather #hamradio #hamr

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Tom DF5JL @tomdf5jl.bsky.social · 13d

HF #Propagation Report - The solar wind speed is currently elevated due to coronal holes. Geomagnetic activity is expected to be unsettled to active (Kp3-4). Isolated stormy periods are also possible (Kp5). Solar activity remains low (M 05% X 01% Proton 01%). #spaceweather #hamradio #hamr

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Tom DF5JL @tomdf5jl.bsky.social · 14d

HF #Propagation Report - The solar wind speed is slightly increased due to coronal holes, and geomagnetic activity is expected to be unsettled to minor stormy (Kp 3-5), before weakening again on Thursday. Solar activity remains low (M 05% X 01% Proton 01%). #spaceweather #hamradio #hamr

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Tom DF5JL @tomdf5jl.bsky.social · 15d

HF #Propagation Report - Solar winds show CME effects, as well as initial signs of fast solar winds due to a coronal hole. These are expected to peak tomorrow at a speed of around 600–700 km/s. Solar activity remains low, with M-flares unlikely (M 05% X 01% Proton 01%). #spaceweather #hamradio #hamr

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Tom DF5JL @tomdf5jl.bsky.social · 17d

Sorry, Gert met een "t" ;)

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Tom DF5JL @tomdf5jl.bsky.social · 17d

Thank you very much, Gert es 73

Tom DF5JL @tomdf5jl.bsky.social · 17d

Hartelijk bedankt, Gerd (Y)

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