HaloCME

Solar physicist at @ LMSAL (alum UTkyAst). I believe space weather forecast needs 4π coverage of remote-sensing and in situ observations. Until then use AI.

[HaloCME @halocme]

My account seems to have been hacked recently. My name and profile were changed. My pinned tweet disappeared.

Here is the original. It was about the M9.0 flare on 3 October 2024.

MOST POWERFUL FLARE IN SOLAR CYCLE 25. It was X9.0 in GOES X-ray measurement. It was quite eruptive, leaving a coronal wave. The eruption/CME seemed to result from magnetic reconnection rather than ideally from a pre-existing flux rope. It may come in less than 3 days.

[HaloCME @halocme]

Eruptive M6.9 flare in AR 14513 today. The coronal wave was not very strong, but the associated CME may have been quite extended . We may be hit during 27-28 August.

[HaloCME @halocme]

There was an M1.7 flare from AR 14507 on the west limb. It was long duration and eruptive as expected, followed by a bright CME. It seems that the eruption started on a large scale, which may have been related to the coronal wave being quite weak.

[HaloCME @halocme]

Today's M8.1 from AR 14513 was quite eruptive with an impressive coronal wave propagating preferentially southward (counterclockwise). This was followed by a filament eruption. This is the first time this month I see an eruption of this magnitude.

[Vincent Ledvina @Vincent_Ledvina]

Full-resolution videos of the M8.1 flare + CME shows a beautiful eruption off the eastern limb. This won't affect Earth as the region is on the side of the Sun as seen from our planet. Over time, AR 4513 will rotate closer to the Earth strike zone, and future CMEs have a higher chance of being at least partially Earth-directed.

[HaloCME @halocme]

Attending COSPAR 2026, I was away from monitoring the Sun. Here is an animation of an M1.9 flare on July 30 from AR 14492, associated with an energetic CME responsible for an S1 storm (18 pfu). A classic eruptive flare by a filament eruption and accompanying a weak coronal wave.

[HaloCME @halocme]

AR 14493 is growing. It recently produced an M3.4 flare. So far none of the flares from the region were eruptive (hence no CME), but this can change while it is still in Earth-strike zone.

[HaloCME @halocme]

The X1.3 flare from the newly numbered region AR 14482 looked less eruptive than the three M-class flares in AR 14479 (X1.1 on 06/30, M4.2 on 07/02 and M6.7 on 07/03), as suggested by coronagraph images. But it was accompanied by a weak coronal wave.

[HaloCME @halocme]

Last week I attended the very productive SHINE 2026 Workshop, and was behind looking at solar images.

I now find a major eruption in AR 14479 on 2 July 2026 associated with a M4.2 flare. Not sure if this contributed to the latest (4 July) geomagnetic storm, but a nice wave.

[HaloCME @halocme]

The first eruption (from AR 14479, north) in my last post resulted in a much bigger CME than the second eruption (from AR 14478, south). The peak fluxes of the flares associated with these eruptions were M6.7 and M6.3 - I mistakenly labeled the latter M6.7, sorry.

[HaloCME @halocme]

Today (2026-07-03) two major eruptions occurred successively. First in AR 14479 in associated with an M6.7 flare, then in AR 14478 in associated with a shorter-duration M6.7 flare. Both were accompanied by a coronal wave, which may inform the extension of the eruption.

[HaloCME @halocme]

Today (2026-07-03) two major eruptions occurred successively. First in AR 14479 in associated with an M6.7 flare, then in AR 14478 in associated with a shorter-duration M6.7 flare. Both were accompanied by a coronal wave, which may inform the extension of the eruption.

[HaloCME @halocme]

Please don't hack my account, which is just to report observations of the Sun and the heliosphere in relation to space weather. I hope people find my posts useful.

[HaloCME @halocme]

My account seems to have been hacked recently. My name and profile were changed. My pinned tweet disappeared.

Here is the original. It was about the M9.0 flare on 3 October 2024.

MOST POWERFUL FLARE IN SOLAR CYCLE 25. It was X9.0 in GOES X-ray measurement. It was quite eruptive, leaving a coronal wave. The eruption/CME seemed to result from magnetic reconnection rather than ideally from a pre-existing flux rope. It may come in less than 3 days.

[HaloCME @halocme]

Eruption associated with an X1.1 flare in AR 14479 - peak time 30 June 2026 20:50 UT. Nice coronal wave was observed but no SEP, even though there was a partial halo CME. Look at the ejected material falling down.

[HaloCME @halocme]

@Roti_YJP @Ocid Cheers!

[HaloCME @halocme]

Eruption from the latest M6.5 flare in AR 14473. A coronal wave is seen, but it does not propagate to right or across the disk due to the extended coronal hole. This effect may help geoeffectiveness of eruptions from the same region a week or so later - if it survives.

[HaloCME @halocme]

A sizable eruption apparently on the far side of the Sun. This overshadowed the preceding eruption associated with an M1.3 flare in AR 14472. The source region was likely ~40° behind the east limb, which used to be AR 14432 and AR 14455 in the previous rotations.

[HaloCME @halocme]

Still waiting for the CME that was launched around the midnight of June 10/11? People expected the CME to arrive on June 13 and to cause a G2 storm. Do they think the small enhancement of the solar wind around 09:40 (marked below) is what they predicted? Another #Sadstory ?

[HaloCME @halocme]

Will the CME associated with a C6.7 flare in AR 14465 arrive on 13 June 2026?

There was a nice CME around the midnight of 10/11 June, and both NOAA and NASA predict it to arrive on the 13th.

I feel it may not arrive as it was headed largely to east.

[HaloCME @halocme]

C9.0 flare also from AR 14465. Like its predecessor, C6.7 around midnight, the global disturbances were unimpressive with a weak coronal wave, but they seem to have triggered small eruptions in the southwest (to lower right) direction. Only marginal CME in STEREO/COR2.

[HaloCME @halocme]

Will the CME associated with a C6.7 flare in AR 14465 arrive on 13 June 2026?

There was a nice CME around the midnight of 10/11 June, and both NOAA and NASA predict it to arrive on the 13th.

I feel it may not arrive as it was headed largely to east.

[HaloCME @halocme]

Today's M1.8 flare in AR 14461 was associated with a more promising CME, following the confined C8.8 flare in AR 14456. It was more extended, covering the ecliptic. The coronal wave was also pronounced, and the directly related shock wave was responsible for a minor SEP event.

[HaloCME @halocme]

Were you impressed by the latest geomagnetic storm. I wasn't. It was at the G2 (Kp=6+) level for only three hours. Even though CME-associated major flares occurred on after another in the same region (AR 14455), making people expect enhanced disturbances, I was not convinced.