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Marko Rummelsburg @markorummelsburg.bsky.social · 2h

Two active regions in the northeast ↖️ of the Sun with rapid development (4545, 4549). One of them (4545) fired a non-eruptive M1.07 flare recently.

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Marko Rummelsburg @markorummelsburg.bsky.social · 30/09/2026

Eruptive C8.6-class solar flare from sunspot group 4535 in the northwest of the Sun. A coronal wave reaching the central meridian is visible and a Type II radio burst was detected (est. speed 523 km/s). The potential solar storm might grace earth and compress the preceding one.

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Marko Rummelsburg @markorummelsburg.bsky.social · 28/09/2026

Large partial halo CME ('solar storm'), crossing the central meridian, earth-directed components likely

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Marko Rummelsburg @markorummelsburg.bsky.social · 28/09/2026

Large filament eruption on the western half of the Sun. CME ('solar storm') with earth-directed components possible. Stay tuned.

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Marko Rummelsburg @markorummelsburg.bsky.social · 27/09/2026

Solar Synoptic Map - new regions in the southern hemisphere decayed - region 4535 shows minor complexity and minor flux emergence - some larger filaments present, but they refuse to erupt - coronal hole CH98+ could bring geomagnetic storming in 4-5 days

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Marko Rummelsburg @markorummelsburg.bsky.social · 27/09/2026

It's raining plasma on the Sun's western limb.

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Marko Rummelsburg @markorummelsburg.bsky.social · 27/09/2026

The Sun produced a lightbulb CME ('solar storm'). Its source behind the western limb indicates that it is not earth-directed.

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Marko Rummelsburg @markorummelsburg.bsky.social · 24/09/2026

Synoptic Map of the Sun - we are connected to the stream of coronal hole CH96+ but the solar wind speed is still very low (≈320 km/s) - new regions are emerging all over the visible solar disk, however, they are all magnetically simple (low flare risk)

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Marko Rummelsburg @markorummelsburg.bsky.social · 24/09/2026

New sunspot groups are emerging in the northwestern quadrant of the visible solar disk. However, their complexity is limited, as is the likelihood of major flares or solar storms (at least for now).

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Marko Rummelsburg @markorummelsburg.bsky.social · 14/09/2026

Great aurora show near the arctic circle, here Sweden, 66°N, GMLAT 63°N, 2026-09-14, 2110 UTC

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Marko Rummelsburg @markorummelsburg.bsky.social · 14/09/2026

Some aurora in Estonia, 2026-09-14, 1940 UTC, 59°N, GMLAT 55°N

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Marko Rummelsburg @markorummelsburg.bsky.social · 14/09/2026

The CME(s) from 9 September arrived. We see a decrease of detected neutrons (Forbush decrease) - an indicator for a solar storm passing by.

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Marko Rummelsburg @markorummelsburg.bsky.social · 13/09/2026

Filament eruption on the southern central solar disk. Earth-directed CME ('solar storm') possible

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Marko Rummelsburg @markorummelsburg.bsky.social · 10/09/2026

Earth, Lightbulb, Moon, Trumpet have an appearance in GOES CCOR-1 Coronagraph

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Marko Rummelsburg @markorummelsburg.bsky.social · 10/09/2026

A 'little' filament erupted on the Sun's far side.

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Marko Rummelsburg @markorummelsburg.bsky.social · 10/09/2026

Slow CME ('solar storm') on its way towards the Earth visible in STEREO A's Heliospheric Imager I. Earth is left, Sun is right, we see approx. 0.1 AU - 0.4 AU from the side.

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Marko Rummelsburg @markorummelsburg.bsky.social · 10/09/2026

Filaments on the visible disk of the Sun. (GONG H-alpha, GOES SUVI 304)

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Marko Rummelsburg @markorummelsburg.bsky.social · 09/09/2026

Synoptic Sun - messy magnetic fields with rather simple sunspot groups, 4521 is showing some activity and complexity, 4528 as part of a large cluster in the east as well - many filaments near active regions (ready to erupt?) - coronal hole in the centre may bring fast wind soon

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Marko Rummelsburg @markorummelsburg.bsky.social · 08/09/2026

Faint Aurora, Cape Arkona, DE, 2026-09-08, 20:40 UTC, 54°N, GMLAT 51°N

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Marko Rummelsburg @markorummelsburg.bsky.social · 08/09/2026

Aurora in Popovo, RU, 2026-09-08, 18:35 UTC, 57°N, GMLAT 54°N

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Marko Rummelsburg @markorummelsburg.bsky.social · 08/09/2026

Aurora in Queenstown, NZ, 2026-09-08, 10:00 UTC, 45°S, GMLAT 52°S

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Marko Rummelsburg @markorummelsburg.bsky.social · 08/09/2026

Ongoing Forbush decrease: reduction of detected neutrons at ground level = reduced galactic cosmic rays near earth = large magnetic obstacle (CME, 'solar storm') nearby

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Marko Rummelsburg @markorummelsburg.bsky.social · 07/09/2026

Aurora visible on webcams (with enhanced saturation) near Berlin, Germany and Saxonia near the Czech boarder (2026-09-07, 2200z, 48°N GMLAT and 46°N GMLAT)

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Marko Rummelsburg @markorummelsburg.bsky.social · 06/09/2026

C5.0 solar flare from region 4524 with westward spreading coronal wave, dimming and pretty strong radio bursts. A CME with earth-directed components was released, speed ≈1000 km/s (the third in a row).

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Marko Rummelsburg @markorummelsburg.bsky.social · 06/09/2026

Solar Synoptic Map: A messy Sun produces solar storms. Will we get some mid-latitudes aurora? Read more: spacewx.org/sun-to-play-...

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Marko Rummelsburg @markorummelsburg.bsky.social · 05/09/2026

Explosive M1.0-class solar flare on the western limb of the Sun. - Large CME (solar storm) released (not earth-directed) - Type II and Type IV radio bursts detected - 🚨 Energetic protons were released, S1 radiation storm - 🚨 >=10 MeV protons at 10 pfu, >=100 MeV at 1 pfu

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Marko Rummelsburg @markorummelsburg.bsky.social · 04/09/2026

☀️ A small circular shaped filament erupted 2026-09-04; 19:15 UTC; SDO AIA 304 + SDO AIA 171 Running Difference Type IV and Type II radio bursts detected

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Marko Rummelsburg @markorummelsburg.bsky.social · 04/09/2026

☀️ A small circular shaped filament erupted 2026-09-04; 19:15 UTC

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Marko Rummelsburg @markorummelsburg.bsky.social · 04/09/2026

Filament eruption on the eastern limb of the Sun with coronal loops – 2026-09-03; 22:00 UTC (SDO AIA 171 & 304Å)

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Marko Rummelsburg @markorummelsburg.bsky.social · 04/09/2026

Complex regions with complex magnetic fields are approaching the east limb of the Sun and fire one CME after another. Will there be something left for us?

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Marko Rummelsburg @markorummelsburg.bsky.social · 03/09/2026

Filament eruption, behind the eastern limb of the Sun

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Marko Rummelsburg @markorummelsburg.bsky.social · 02/09/2026

Wobbling loops and a coronal wave after an M3-class solar flare on the east limb of the Sun.

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Marko Rummelsburg @markorummelsburg.bsky.social · 02/09/2026

A small but dense active region filament erupted with an M3.01 solar flare near the east limb of the Sun. Opening magnetic loops can be observed in the corona. (GOES 195, 304; 2026-09-02, 19:10z)

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Marko Rummelsburg @markorummelsburg.bsky.social · 02/09/2026

A bit of activity behind the northeastern limb of the Sun. (SDO AIA 171, 193, 304)

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Marko Rummelsburg @markorummelsburg.bsky.social · 30/08/2026

Solar Synoptic Map - small and fragmented coronal holes with negative polarity in the central region of the solar disk - only simple active regions on the visible solar disk - low risk of solar flares - complex active regions expected behind the eastern limb

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Marko Rummelsburg @markorummelsburg.bsky.social · 28/08/2026

Aurora in Vologda, 59°N, 39°E, 56°N QDLAT + Strezhevoy, 61°N, 77°E, QDLAT 58°N after the arrival of a stream interaction region; 2026-08-28 20:15 UTC

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Marko Rummelsburg @markorummelsburg.bsky.social · 27/08/2026

Solar Synoptic Map - M-class flare producer 4513 is quiet and shows signs of decay, stronger isolated flares still possible - New sunspot group 4518 in the east produces C-class flares - Positive coronal hole influence anticipated but likely overestimated by models

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Marko Rummelsburg @markorummelsburg.bsky.social · 25/08/2026

48 hours of flux emergence in the central region of the solar disk. Sunspot group 4513 has developed magnetic shear and the surrounding spots are interacting with it. There is a chance for more moderate to strong solar flares and CMEs (solar storms).

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Marko Rummelsburg @markorummelsburg.bsky.social · 21/08/2026

Gorgeous supra-arcade downflows (SAD, SADpoles) associated with a long-duration M1.6-class solar flare behind the western limb of the Sun. (SDO AIA 193, 131)

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Marko Rummelsburg @markorummelsburg.bsky.social · 21/08/2026

Leaving region 4507 behind the west limb of the Sun produced one of the prettiest solar flare events (M1.6) this year with supra-arcade downflows (green) and impressive post-eruptive arcades. Large parts of corona in the vicinity of the event were evacuated. (SDO AIA 171, 195, 211 composite)

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Marko Rummelsburg @markorummelsburg.bsky.social · 20/08/2026

Solar Synoptic Map - Coronal holes CH88 and CH87 bring fast solar wind (≈550 km/s) with declining trend - C-class flare producing sunspot group 4507 is about to leave the visible solar disk - Complex region 4513 appears to be growing, it is producing M-class flares (max M8.1) and CMEs (solar storms)

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Marko Rummelsburg @markorummelsburg.bsky.social · 20/08/2026

Strong M8.1-class solar flare from the Sun's eastern limb (⬅️) accompanied by a Type-II radio burst (estimated speed 1201 km/s). A coronal hole southwest of the source region will likely deflect CMEs eastwards. (SDO AIA 171, 193, 211 RGB Composite)

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Marko Rummelsburg @markorummelsburg.bsky.social · 20/07/2026

A ton of magnetic flux is emerging near a trans-equatorial coronal hole in the centre of the visible solar disk. The resulting anemone-shaped sunspot group 4493 recently produced an M2.5-class solar flare.

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Marko Rummelsburg @markorummelsburg.bsky.social · 17/07/2026

Solar Synoptic Map - quiet sun, flare activity near/behind the SE limb only 👀 - quite large trans-equatorial coronal hole to the east, its fast wind may arrive in 4-7 days

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Marko Rummelsburg @markorummelsburg.bsky.social · 16/07/2026

Stunning plasma ballet during a long-duration flare event near the south-eastern↙︎ limb of the Sun (7 hours of SDO AIA 171, AIA 211, AIA 131)

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Marko Rummelsburg @markorummelsburg.bsky.social · 14/07/2026

Solar flares and CMEs (solar storms) near the southeastern limb of the sun ↙︎ [GOES SUVI 131, 195 + 284/195/171 base difference]

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Marko Rummelsburg @markorummelsburg.bsky.social · 12/07/2026

The eruption of a core filament (sunspot group 4485) lets the surrounding filaments wiggle. A CME (solar storm) towards SW↘︎, a Type II and a Type IV radio burst as well as a long duration C6.0 flare (again) have been observed. A coronal wave is visible, moving from SW↘︎ to NE↖︎.

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