Solar wind
speed: 317.6 km/sec
density: 7.2 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 0620 UT

X-ray Solar Flares
6-hr max: B1 0226 UT Sep16
24-hr: B2 1415 UT Sep15
explanation | more data
Updated: Today at: 0625 UT

MINOR GEOMAGNETIC STORM WATCH: A CME is approaching Earth for a close encounter on Sept. 17th. It will either miss or deliver a glancing blow. Both outcomes are equally possible given uncertainties in the CME's trajectory. A hit could spark minor G1-class geomagnetic storms and high-latitude auroras.

Solar wind
speed: 333.4 km/sec
density: 7.2 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 1345 UT

X-ray Solar Flares
6-hr max: A1 0000 UT Jan01
24-hr: B2 1415 UT Sep15
explanation | more data
Updated: Today at: 1350 UT

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Solar wind
speed: 393.0 km/sec
density: 6.7 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 0419 UT

X-ray Solar Flares
6-hr max: C3 0420 UT Sep17
24-hr: B1 0226 UT Sep16
explanation | more data
Updated: Today at: 0425 UT

WEAK IMPACT: A CME hit Earth's magnetic field on Sept. 17th at ~0200 UT. The impact was very weak, lifting the solar wind speed by a measly 40 km/s. There's still a chance for geomagnetic unrest, however, as Earth passes through the CME's turbulent and magnetized wake.

Solar wind
speed: 405.0 km/sec
density: 18.2 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 2154 UT

X-ray Solar Flares
6-hr max: A8 1148 UT Sep16
24-hr: C3 0420 UT Sep17
explanation | more data
Updated: Today at: 2200 UT

Solar wind
speed: 381.9 km/sec
density: 10.9 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 0909 UT

X-ray Solar Flares
6-hr max: A8 1148 UT Sep16
24-hr: B1 0226 UT Sep16
explanation | more data
Updated: Today at: 0915 UT

GEOMAGNETIC STORM WATCH: Earth's magnetic field remains unsettled following the impact of a CME on Sept. 17th.

NOAA forecasters say there is a chance of G2-class geomagnetic storms on Sept. 18th as Earth passes through the CME's wake.

Solar wind
speed: 375.4 km/sec
density: 11.4 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 1556 UT

X-ray Solar Flares
6-hr max: A8 1148 UT Sep16
24-hr: B1 0226 UT Sep16
explanation | more data
Updated: Today at: 1605 UT

SUBSIDING GEOMAGNETIC ACTIVITY: The storm is over. Earth's magnetic field is quieting on Sept. 18th following G1-class storm conditions in the wake of yesterday's CME (see below). Bright auroras will probably retreat to the Arctic Circle as the storm continues to subside in the hours ahead.

Solar wind
speed: 331.5 km/sec
density: 6.5 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 0424 UT

X-ray Solar Flares
6-hr max: A8 1148 UT Sep16
24-hr: C2 0827 UT Sep18
explanation | more data
Updated: Today at: 0430 UT

Solar wind
speed: 312.8 km/sec
density: 6.5 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 1724 UT

X-ray Solar Flares
6-hr max: C2 0122 UT Sep19
24-hr: C1 0115 UT Sep19
explanation | more data
Updated: Today at: 1730 UT

Solar wind
speed: 303.5 km/sec
density: 10.5 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 2049 UT

X-ray Solar Flares
6-hr max: B4 1925 UT Sep20
24-hr: B8 0936 UT Sep20
explanation | more data
Updated: Today at: 2055 UT

Solar wind
speed: 331.9 km/sec
density: 15.9 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 1845 UT

X-ray Solar Flares
6-hr max: C1 1828 UT Sep21
24-hr: C1 1153 UT Sep21
explanation | more data
Updated: Today at: 1850 UT

Solar wind
speed: 368.2 km/sec
density: 4.3 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 1826 UT

X-ray Solar Flares
6-hr max: B2 1316 UT Sep22
24-hr: C1 1829 UT Sep21
explanation | more data
Updated: Today at: 1830 UT

GLANCING BLOW CME, INCOMING: A dark filament of magnetism exploded away from the sun's southern hemisphere on Sept. 19th. Watch the movie. NOAA analysts say the debris could reach Earth on Sept. 23rd in the form of a weak CME. A likely glancing blow could spark minor G1-class geomagnetic storms.

Solar wind
speed: 394.2 km/sec
density: 9.6 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 0354 UT

X-ray Solar Flares
6-hr max: B3 0355 UT Sep23
24-hr: C1 2014 UT Sep22
explanation | more data
Updated: Today at: 0400 UT

🔥 Solar wind
speed: 462.2 km/sec
density: 7.9 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 0430 UT

X-ray Solar Flares
6-hr max: B1 0252 UT Sep24
24-hr: M2 0442 UT Sep23
explanation | more data
Updated: Today at: 0435 UT

SOLAR ACTIVITY INTENSIFIES: So far today, sunspot AR2871 has produced two M-class solar flares, an M2 (1528 UT) and an M3 (0442 UT). The more powerful of the two flares is detailed below. Both explosions hurled CMEs into space, but perhaps not directly toward Earth. Glancing blows are possible on Sept. 26-27. Stay tuned for updates as more data become available.