Space weather

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Modest CME glancing blow from May 28 long-duration solar flare

A small part of coronal mass ejection (CME) produced by a long-duration C-class solar flare on May 28 hit Earth on June 2, 2021, barely disturbing Earth's magnetic field. Solar wind parameters are likely to become slightly enhanced due to the influence of a...

June 03, 2021

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Long-duration C9.4 solar flare erupts from AR 2824, generating fast CME and S1 - Minor solar radiation storm

A long-duration C9.4 solar flare erupted from Active Region 2824 at 23:13 UTC on May 28, 2021, producing a strong coronal mass ejection (CME) and S1 - Minor proton radiation storm. The flare event was associated with Type II Radio Emission with an estimated velocity...

May 29, 2021

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Multiple Earth-directed CMEs produced over the weekend

Solar activity has increased from low to moderate levels on Saturday and Sunday, May 22 and 23, 2021, with a series of C- and M-class solar flares produced by Active Region 2824. Multiple CMEs were produced during this period, with several having Earth-directed...

May 24, 2021

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Moderately strong M1.1 solar flare erupts from Region 2824

A moderately strong solar flare measuring M1.1 at its peak erupted from Active Region 2824 (Alpha) at 17:11 UTC on May 22, 2021. The event started at 17:03 and ended at 17:16 UTC. Its location does not favor Earth-directed CMEs, but there is a possibility that a...

May 22, 2021

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Geomagnetic storm watch in effect for May 18

NOAA SWPC forecasters have issued a geomagnetic storm watch for May 18, 2021, after a pair of coronal mass ejections (CMEs) launched from the Sun on May 13 and 14. Enhanced solar wind parameters are expected on May 17 due to the influence of a negative polarity...

May 17, 2021

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CME impacts Earth, sparking G3 - Strong geomagnetic storm

A coronal mass ejection (CME) produced by a filament eruption around 10:00 UTC on May 9, 2021, has reached Earth at 06:43 UTC on May 12. G3 - Moderate geomagnetic storm levels were observed at 12:59 UTC. The CME arrived at the DSCOVR spacecraft at 05:47 UTC. Solar...

May 12, 2021

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Incoming CME, impact expected early May 12

Two coronal mass ejections (CMEs) with Earth-directed components were produced on the Sun on May 9, 2021. The impact is expected early Wednesday, May 12. Active Region 2833 produced a long-duration C-class solar flare measuring C4.0 at its peak at 14:49 UTC on May 9...

May 10, 2021

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M3.9 solar flare erupts from Active Region 2822

A strong solar flare measuring M3.9 at its peak erupted from Active Region 2822 at 19:04 UTC on May 7, 2021. While this is one of the strongest solar flares of the new solar cycle -- SC25, the location of region 2822 does not favor Earth-directed CMEs. This event...

May 08, 2021

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G2 - Moderate geomagnetic storm watch in effect for April 25

A partial halo Coronal Mass Ejection (CME) produced by the C3.8 solar flare from Region 2816 at 04:35 UTC on April 22 is heading toward Earth and is expected to arrive on April 25. As a result, a G2 - Moderate geomagnetic storming is expected. This CME has been...

April 24, 2021

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C3.8 solar flare erupts from geoeffective Region 2816, CME produced

A C3.8 solar flare erupted from Active Region 2816 at 04:35 UTC on April 22, 2021, producing a coronal mass ejection (CME). The event started at 04:10 and ended at 05:00 UTC. The location of the source region favors Earth-directed CMEs. The flare was associated with...

April 22, 2021

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M1.1 solar flare erupts from AR 2816, produces coronal mass ejection (CME)

A moderately strong solar flare measuring M1.1 at its peak erupted at 23:42 UTC on April 19, 2021. The event started at 23:19 and ended at 23:59 UTC. The source was Active Region 2816 (beta). Associated with this event were Type II (shock velocity of 750 km/s) and...

April 20, 2021

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Solar wind parameters indicate the arrival of a slow-moving CME

Solar wind parameters over the past 12 hours indicated the arrival of a slow-moving Coronal Mass Ejection (CME), likely produced on April 10. A period of G1 - Minor storming began at 08:59 UTC on April 15. Another enhancement in parameters is expected on April 16...

April 15, 2021

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Negative polarity CH HSS sparks G2 - Moderate geomagnetic storm

Earth is under the influence of negative polarity coronal hole high speed stream (CH HSS) over the past 24 hours, sparking G2 geomagnetic storming. The source is a polar connected coronal hole located in the Sun's southern hemisphere. Geomagnetic K-index of 5...

March 20, 2021

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Negative polarity CH HSS sparks G1 - Minor geomagnetic storm and auroras in the lower 48

Earth is under the influence of a negative polarity coronal hole high speed stream, sparking G1 - Minor geomagnetic storm and auroras as low as Michigan and Wisconsin, U.S. Enhanced solar wind parameters were observed on March 13, 2021, due to co-rotating...

March 14, 2021

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Negative polarity CH HSS sparks G2 - Moderate geomagnetic storm

Earth is under the influence of a negative polarity coronal hole high speed stream (CH HSS) on March 1, 2021, sparking G1 - Minor and G2 - Moderate geomagnetic storming. Solar wind speed started increasing late February 28, from 369 km/s at 22:00 UTC to 521 km/s at...

March 01, 2021

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Filament eruption produces partial-halo CME, glancing blow expected

A solar filament eruption took place shortly before 12:00 UTC on February 20, 2021, producing a partial-halo CME. Analysis suggests a glancing blow from the periphery of the CME is likely on February 23 or 24. The CME signature was first observed in SOHO/LASCO C2...

February 22, 2021

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Slow-moving transient sparks vivid auroras around the Arctic circle

Solar wind parameters reflected the arrival of a slow-moving transient at approximately 08:23 UTC on January 11, 2021. At this time, density, temperature, and wind speed increased, sparking vivid auroras around the Arctic circle. The cause of the shock wave might...

January 12, 2021