Tom DF5JL
@tomdf5jl.bsky.social
We can be heroes, just for one day.
Researchers describe a new method for investigating the stability of sunspots in Astronomy & Astrophysics. Analysis of polarized light shows that magnetic forces are precisely balanced by pressure forces, which explains the stability of spots lasting from days to weeks. #spaceweather #hamradio #hamr
December 4, 2025 at 9:48 AM
Researchers describe a new method for investigating the stability of sunspots in Astronomy & Astrophysics. Analysis of polarized light shows that magnetic forces are precisely balanced by pressure forces, which explains the stability of spots lasting from days to weeks. #spaceweather #hamradio #hamr
HF #Propagation Report - Solar wind speed is abt. 700 km/s due to coronal hole CH04/-. Geomagnetic activity is expected to be active up to G1/G2 (Kp5-6), later subsiding. Moderate to high solar activity continues to be forecast (M 75% X 30% Proton 15%). #spaceweather #hamradio #hamr
December 4, 2025 at 7:56 AM
HF #Propagation Report - Solar wind speed is abt. 700 km/s due to coronal hole CH04/-. Geomagnetic activity is expected to be active up to G1/G2 (Kp5-6), later subsiding. Moderate to high solar activity continues to be forecast (M 75% X 30% Proton 15%). #spaceweather #hamradio #hamr
HF #Propagation Report - Initially, geomagnetic activity will be mainly quiet, but will become active to stormy (G1) later on. NOAA forecasts moderate to high solar activity with the possibility of isolated M-flares and further X-flares (M 75%, X 30%, Proton 20%). #spaceweather #hamradio #hamr
December 3, 2025 at 5:55 AM
HF #Propagation Report - Initially, geomagnetic activity will be mainly quiet, but will become active to stormy (G1) later on. NOAA forecasts moderate to high solar activity with the possibility of isolated M-flares and further X-flares (M 75%, X 30%, Proton 20%). #spaceweather #hamradio #hamr
HF #Propagation Report - Despite the Sun's activity calming down, further strong solar flares are expected (M 70%, X 30%, 10% Proton). Geomagnetic activity is expected to be quiet to unsettled today (Kp 2-3), and stormy again tomorrow (Kp 5-6) due to a coronal hole. #spaceweather #hamradio #hamr
December 2, 2025 at 7:30 AM
HF #Propagation Report - Despite the Sun's activity calming down, further strong solar flares are expected (M 70%, X 30%, 10% Proton). Geomagnetic activity is expected to be quiet to unsettled today (Kp 2-3), and stormy again tomorrow (Kp 5-6) due to a coronal hole. #spaceweather #hamradio #hamr
The NOAA forecasts an SFI of 190 units for the coming days! #spaceweather #propagation #hamradio #hamr
December 1, 2025 at 5:06 PM
The NOAA forecasts an SFI of 190 units for the coming days! #spaceweather #propagation #hamradio #hamr
HF #Propagation Report - Solar activity is at a high level following an X2 flare. Occasional M-class flares and the possibility of isolated X-class flares are expected (M 70% X 20% Proton 10%). Geomagnetic activity is quiet to active (Kp 2-4). Conditions are moderate. #spaceweather #hamradio #hamr
December 1, 2025 at 5:57 AM
HF #Propagation Report - Solar activity is at a high level following an X2 flare. Occasional M-class flares and the possibility of isolated X-class flares are expected (M 70% X 20% Proton 10%). Geomagnetic activity is quiet to active (Kp 2-4). Conditions are moderate. #spaceweather #hamradio #hamr
On Friday, we observed an extremely active sunspot region on the southeastern edge of the sun. Since today, NASA's Solar Dynamics Observatory has shown this veritable monster in all its glory. This group is now listed as AR4294. A source of new X-class flares? #spaceweather #hamradio #hamr
November 30, 2025 at 8:18 AM
On Friday, we observed an extremely active sunspot region on the southeastern edge of the sun. Since today, NASA's Solar Dynamics Observatory has shown this veritable monster in all its glory. This group is now listed as AR4294. A source of new X-class flares? #spaceweather #hamradio #hamr
HF #Propagation Report - Geomagnetic activity will be unsettled to active (Kp 3-4). Solar activity has been moderate over the past 24 hours with two M-class flares, originated from the new region on the SE edge. Further M-class flares are likely (M40% X05% Proton01%). #spaceweather #hamradio #hamr
November 29, 2025 at 5:42 AM
HF #Propagation Report - Geomagnetic activity will be unsettled to active (Kp 3-4). Solar activity has been moderate over the past 24 hours with two M-class flares, originated from the new region on the SE edge. Further M-class flares are likely (M40% X05% Proton01%). #spaceweather #hamradio #hamr
Update: New active regions are now rotating from behind the southeastern edge onto the visible side of the Sun. #spaceweather #hamradio #hamr
November 28, 2025 at 8:56 AM
Update: New active regions are now rotating from behind the southeastern edge onto the visible side of the Sun. #spaceweather #hamradio #hamr
HF #Propagation Report - Geomagnetic activity is expected to be unstable to active (Kp 3-4), with the probability of isolated minor storms decreasing. Solar activity is low, with isolated M-flares possible (M 15% X 01% Proton 01%). #spaceweather #hamradio #hamr
November 28, 2025 at 7:36 AM
HF #Propagation Report - Geomagnetic activity is expected to be unstable to active (Kp 3-4), with the probability of isolated minor storms decreasing. Solar activity is low, with isolated M-flares possible (M 15% X 01% Proton 01%). #spaceweather #hamradio #hamr
November 27, 2025 at 6:55 PM
HF #Propagation Report - Geomagnetic activity is expected to be unsettled to active (Kp 3-4) at first, with isolated stormy intervals also possible (Kp 5-6). Low solar activity is still forecast, with a low probability of isolated M-flares (M 15%, X 01%, Proton 01%). #spaceweather #hamradio #hamr
November 26, 2025 at 7:16 AM
HF #Propagation Report - Geomagnetic activity is expected to be unsettled to active (Kp 3-4) at first, with isolated stormy intervals also possible (Kp 5-6). Low solar activity is still forecast, with a low probability of isolated M-flares (M 15%, X 01%, Proton 01%). #spaceweather #hamradio #hamr
HF #Propagation Report - Geomagnetic activity is moderate to strong (Kp 3-4), with isolated storm intervals (Kp 5) possible due to a coronal hole. Weak solar activity is expected to continue, with a low probability of isolated M-flares (M 15%, X 01%, proton 01%). #spaceweather #hamradio #hamr
November 25, 2025 at 5:55 AM
HF #Propagation Report - Geomagnetic activity is moderate to strong (Kp 3-4), with isolated storm intervals (Kp 5) possible due to a coronal hole. Weak solar activity is expected to continue, with a low probability of isolated M-flares (M 15%, X 01%, proton 01%). #spaceweather #hamradio #hamr
Fast solar winds of around 750 km/s are currently shaking the Earth's magnetic field, which is why we currently have a Kp index of 4. The NOAA is even warning of a minor magnetic storm (k=5 / G1) until this evening. #spaceweather #hamradio #hamr
November 24, 2025 at 1:41 PM
Fast solar winds of around 750 km/s are currently shaking the Earth's magnetic field, which is why we currently have a Kp index of 4. The NOAA is even warning of a minor magnetic storm (k=5 / G1) until this evening. #spaceweather #hamradio #hamr
SCMP: "Chinese scientists claim they have cracked a decades-old dilemma, turning a much sought-after vision into reality" #science #china #mil #intel
www.scmp.com/news/china/s...
www.scmp.com/news/china/s...
China builds advanced power source for particle beam system in space
Chinese scientists claim they have cracked a decades-old dilemma, turning a much sought-after vision into reality.
www.scmp.com
November 23, 2025 at 8:01 AM
SCMP: "Chinese scientists claim they have cracked a decades-old dilemma, turning a much sought-after vision into reality" #science #china #mil #intel
www.scmp.com/news/china/s...
www.scmp.com/news/china/s...
SCMP: "Findings suggest jamming Starlink across area matching Taiwan is technically feasible, but only at huge scale needing 1,000 drones or more." #science #china #mil #intel www.scmp.com/news/china/s...
China team simulates large-scale electronic warfare against Musk’s Starlink
Findings suggest jamming Starlink across area matching Taiwan is technically feasible, but only at huge scale needing 1,000 drones or more.
www.scmp.com
November 23, 2025 at 7:53 AM
SCMP: "Findings suggest jamming Starlink across area matching Taiwan is technically feasible, but only at huge scale needing 1,000 drones or more." #science #china #mil #intel www.scmp.com/news/china/s...
HF #Propagation Report - Geomagnetic activity is expected to be quiet to unsettled, with the possibility of isolated active intervals. Low solar activity will continue, with a low probability of an isolated M-class flare (M 15% X 01% Proton 01%). Next HSS on Tuesday #spaceweather #hamradio #hamr
November 22, 2025 at 6:32 AM
HF #Propagation Report - Geomagnetic activity is expected to be quiet to unsettled, with the possibility of isolated active intervals. Low solar activity will continue, with a low probability of an isolated M-class flare (M 15% X 01% Proton 01%). Next HSS on Tuesday #spaceweather #hamradio #hamr
HF #Propagation Report - Geomagnetic activity will be quiet to unsettled today, with active to stormy periods. Activity is then expected to decrease over the weekend and be predominantly calm. Solar activity is low, and is expected to remain so (M 15% X 01% Proton 01%). #spaceweather #hamradio #hamr
November 21, 2025 at 5:31 AM
HF #Propagation Report - Geomagnetic activity will be quiet to unsettled today, with active to stormy periods. Activity is then expected to decrease over the weekend and be predominantly calm. Solar activity is low, and is expected to remain so (M 15% X 01% Proton 01%). #spaceweather #hamradio #hamr
HF #Propagation Report - Geomagnetic activity is expected to be quiet. Solar activity is also low, although there is a low probability of an isolated M-flare (M 15% X 01% Proton 01%). Fast winds from a coronal hole are now expected to arrive on Friday. #spaceweather #hamradio #hamr
November 20, 2025 at 6:12 AM
HF #Propagation Report - Geomagnetic activity is expected to be quiet. Solar activity is also low, although there is a low probability of an isolated M-flare (M 15% X 01% Proton 01%). Fast winds from a coronal hole are now expected to arrive on Friday. #spaceweather #hamradio #hamr
HF #Propagation Report - Geomagnetic activity is expected to be quiet to unsettled, active intervals are continuing to decrease. Solar activity is low, with only C-flares observed in the last 24 hours. Isolated M-class flares are possible (M 15% X 01% Proton 01%). #spaceweather #hamradio #hamr
November 18, 2025 at 5:48 AM
HF #Propagation Report - Geomagnetic activity is expected to be quiet to unsettled, active intervals are continuing to decrease. Solar activity is low, with only C-flares observed in the last 24 hours. Isolated M-class flares are possible (M 15% X 01% Proton 01%). #spaceweather #hamradio #hamr
HF #Propagation Report - Geomagnetic activity is quiet to active, but activity will decreasing during the day. Solar activity has been moderate over the past 24 hours (M3.1 16/0817UT). There is still a possibility of isolated M flares (M 55% X 15% Proton 10%). #spaceweather #hamradio #hamr
November 17, 2025 at 5:48 AM
HF #Propagation Report - Geomagnetic activity is quiet to active, but activity will decreasing during the day. Solar activity has been moderate over the past 24 hours (M3.1 16/0817UT). There is still a possibility of isolated M flares (M 55% X 15% Proton 10%). #spaceweather #hamradio #hamr
The #HAARP research program has announced a measurement campaign for November 17-22. The campaign will take place at frequencies between 2.75 and 9.6 MHz. Details can be found in the attached document. #spaceweather #hamradio #hamr
November 15, 2025 at 9:18 AM
The #HAARP research program has announced a measurement campaign for November 17-22. The campaign will take place at frequencies between 2.75 and 9.6 MHz. Details can be found in the attached document. #spaceweather #hamradio #hamr
HF #Propagation Report - Geomagnetic activity is expected to be predominantly quiet, rising to unsettled to active (Kp 3–4) on Sunday. Stormy periods are possible on SU/MO due to fast solar wind and CME effects. Further M flares are likely (M 70%, X 30%, Proton 40%). #spaceweather #hamradio #hamr
November 15, 2025 at 8:38 AM
HF #Propagation Report - Geomagnetic activity is expected to be predominantly quiet, rising to unsettled to active (Kp 3–4) on Sunday. Stormy periods are possible on SU/MO due to fast solar wind and CME effects. Further M flares are likely (M 70%, X 30%, Proton 40%). #spaceweather #hamradio #hamr
The Veterans Day Magnetic Storm is over. The curves are messure points by the ionosounder in Dourbes/Belgium. #spaceweather #hamradio #hamr
November 14, 2025 at 6:57 PM
The Veterans Day Magnetic Storm is over. The curves are messure points by the ionosounder in Dourbes/Belgium. #spaceweather #hamradio #hamr
November 14, 2025 at 11:03 AM