Halo CME (@halocme) 's Twitter Profile
Halo CME

@halocme

Solar physicist (alum UTkyAst). I believe solar polar magnetic field must be measured properly before predictions of space weather and solar cycle make sense.

ID: 1934588731

calendar_today04-10-2013 15:16:35

4,4K Tweet

28,28K Followers

983 Following

Halo CME (@halocme) 's Twitter Profile Photo

Yes, the second eruption was not in AR 14274, which was still a distance from the Earth Strike zone. It was instead in AR 14272, which is a simple spot region. Anyway, prediction of Earth-directed CMEs may depend on how the regions in this picture are magnetically connected.

Yes, the second eruption was not in AR 14274, which was still a distance from the Earth Strike zone.  It was instead in AR 14272, which is a simple spot region.  Anyway, prediction of Earth-directed CMEs may depend on how the regions in this picture are magnetically connected.
Halo CME (@halocme) 's Twitter Profile Photo

Another eruption from AR 14274, associated with an M7.4 flare. We do not see as smooth wave fronts as we did in the earlier events. Dimming is not particularly strong. I think this means the eruption started at higher altitude. It resulted in a nice halo CME in coronagraph data.

Halo CME (@halocme) 's Twitter Profile Photo

Yet another eruption from AR 14274 with a nice coronal wave that strongly disturbed the lower corona. The associated flare was M8.6. With these eruptions resulting in halo CMEs, it would be very challenging to interpret the 1 AU in situ during 7-10 Nov .

Halo CME (@halocme) 's Twitter Profile Photo

The eruption on November 9, around 7 UT, was associated with an X1.7 flare from AR 14274. The amplitude of the coronal wave was not very high, but the disturbances spread widely and quickly. I agree that the CME from this eruption may noticeably impact us during November 11-12.

Halo CME (@halocme) 's Twitter Profile Photo

Today's solar eruption (associated with an X1.2 flare) was responsible for a proton event (29 pfu). This reflects our region AR 14274 rotating into well-connected longitudes. This particular event had a soft spectrum (only a modest increase above 50 MeV), implying a weak shock.

Today's solar eruption (associated with an X1.2 flare) was responsible for a proton event (29 pfu). This reflects our region AR 14274 rotating into well-connected longitudes. This particular event had a soft spectrum (only a modest increase above 50 MeV), implying a weak shock.
Halo CME (@halocme) 's Twitter Profile Photo

Solar active region AR 12474 keeps launching spatially extended eruptions and CMEs. The coronal wave accompanying the latest one from the morning of 2025-11-10 was nor very strong bur was seen in all directions. It passed the well-connected region, and hence an SEP event > 10pfu.

Halo CME (@halocme) 's Twitter Profile Photo

Active Sun: X-class flare (peak X5.1) in progress. This must be from AR 14274 (now in the western hemisphere), and associated with a fast CME that drives a shock wave, accelerating particles. The proton event shows a significant increase above 100 MeV.

Active Sun: X-class flare (peak X5.1) in progress.  This must be from AR 14274 (now in the western hemisphere), and associated with a fast CME that drives a shock wave, accelerating particles.  The proton event shows a significant increase above 100 MeV.
Halo CME (@halocme) 's Twitter Profile Photo

Beautiful halo CME associated with the latest X5.1 flare as captured by the compact coronagraph on GOES-19 (CCOR-1). Stay tuned about the possible impact of this CME on Earth.

Beautiful halo CME associated with the latest X5.1 flare as captured by the compact coronagraph on GOES-19 (CCOR-1). Stay tuned about the possible impact of this CME on Earth.
Halo CME (@halocme) 's Twitter Profile Photo

Another eruption from AR12474, associated with an X5.1 flare. It has become a full halo CME. I am truly impressed by how fast and global this coronal wave is. The CME will arrive on November 13, but because of earlier CMEs it will be challenging to isolate the ICME from this.

Halo CME (@halocme) 's Twitter Profile Photo

The proton event from this eruption will certainly be registered as GLE #77, the fourth in solar cycle 25. The plot comes from nmdb.eu/nest/data/uplo… .

The proton event from this eruption will certainly be registered as GLE #77, the fourth in solar cycle 25.  The plot comes from nmdb.eu/nest/data/uplo… .
Halo CME (@halocme) 's Twitter Profile Photo

Update: A shock wave arrived around 22 UT on November 11, 2025. This is probably the CME that left the Sun on November 9. We are still waiting two more to come. Stay tuned.

Update: A shock wave arrived around 22 UT on November 11, 2025.  This is probably the CME that left the Sun on November 9.  We are still waiting two more to come. Stay tuned.
Halo CME (@halocme) 's Twitter Profile Photo

What a surprise! A much stronger shock has arrived shortly after I reported the first one. This should be from the CME on November 10. We have already seen a G5 (Kp:-9-, Dst:-225nT) storm. These values should be still preliminary, though.

What a surprise!   

A much stronger shock has arrived shortly after I reported the first one.  This should be from the CME on November 10.

We have already seen a G5 (Kp:-9-, Dst:-225nT) storm.  These values should be still preliminary, though.
Halo CME (@halocme) 's Twitter Profile Photo

Correction: I meant AR14274, and not AR12474. Sorry for the confusion. But this is a gorgeous event, nonetheless. I think we are still waiting for its arrival after the G5 storm.

Halo CME (@halocme) 's Twitter Profile Photo

Yesterday I thought the big CME launched on Nov 11 may produce a bigger geomagnetic storm today than the G5 we saw then. It will not happen. This CME already arrived as a smaller shock (third line). It looked spectacular but its Earth-directed component may have been not strong.

Yesterday I thought the big CME launched on Nov 11 may produce a bigger geomagnetic storm today than the G5 we saw then. It will not happen. This CME already arrived as a smaller shock (third line). It looked spectacular but its Earth-directed component may have been not strong.
Halo CME (@halocme) 's Twitter Profile Photo

Active Sun: X-class flare again in AR 14274. The peak is at X4.05 (2025-11-14T08:30:00). The proton flux is increasing as expected from an eruptive flare in the western hemisphere.

Active Sun: X-class flare again in AR 14274.  The peak is at X4.05 (2025-11-14T08:30:00).   The proton flux is increasing as expected from an eruptive flare in the western hemisphere.
Halo CME (@halocme) 's Twitter Profile Photo

The four CMEs (all with an X-class flare) in AR 14274 are labeled CME1-4, and the shock waves they drove are Shock1-4 as observed near Earth. After Shock2, followed by a G5 storm, Shock3 driven by spectacular CME3 was expected to leave bigger effects, which did not happen.

The four CMEs (all with an X-class flare) in AR 14274 are labeled CME1-4, and the shock waves they drove are Shock1-4 as observed near Earth. After Shock2, followed by a G5 storm, Shock3 driven by spectacular CME3 was expected to leave bigger effects, which did not happen.
Halo CME (@halocme) 's Twitter Profile Photo

Animation of the X4.0 flare in AR 14274 on 2025-11-14. Nice coronal wave but not as spectacular as the X5.1 event on 2024-11-11. Protons were observed in the GOES >100 MeV channel but not >500 MeV channel. It is up to professional forecasters to say if more big events are coming.

Halo CME (@halocme) 's Twitter Profile Photo

Halo CME from the far side observed on 2025-11-21. This likely came from AR 14274, which seems to be still alive, per helioseismic data.