Solar wind
speed: 447.3 km/sec
density: 3.6 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 0758 UT

X-ray Solar Flares
6-hr max: A5 0205 UT Aug17
24-hr: B1 0927 UT Aug16
explanation | more data
Updated: Today at: 0805 UT

Solar wind
speed: 433.5 km/sec
density: 4.0 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 1915 UT

X-ray Solar Flares
6-hr max: A5 1323 UT Aug17
24-hr: A9 1101 UT Aug17
explanation | more data
Updated: Today at: 1920 UT

Solar wind
speed: 444.5 km/sec
density: 4.1 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 0508 UT

X-ray Solar Flares
6-hr max: A4 2305 UT Aug17
24-hr: A9 1101 UT Aug17
explanation | more data
Updated: Today at: 0515 UT

Solar wind
speed: 334.1 km/sec
density: 3.1 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 0620 UT

X-ray Solar Flares
6-hr max: A8 0247 UT Aug19
24-hr: B2 2007 UT Aug18
explanation | more data
Updated: Today at: 0625 UT

NAKED-EYE NOVA UPDATE: It's not a naked-eye nova anymore. White dwarf star RS Oph, which exploded on Aug. 8th, has dimmed 16-fold to magnitude +7.5. For five days after the blast, the exploding star could be seen with the naked eye after sunset in the constellation Ophiuchus. Now a telescope is required.

Solar wind
speed: 321.6 km/sec
density: 7.8 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 0544 UT

X-ray Solar Flares
6-hr max: B3 0547 UT Aug20
24-hr: B3 0547 UT Aug20
explanation | more data
Updated: Today at: 0550 UT

Solar wind
speed: 317.2 km/sec
density: 7.6 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 0610 UT

X-ray Solar Flares
6-hr max: B3 0410 UT Aug21
24-hr: C3 1557 UT Aug20
explanation | more data
Updated: Today at: 0615 UT

Solar wind
speed: 309.1 km/sec
density: 12.7 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 0615 UT

X-ray Solar Flares
6-hr max: C1 0414 UT Aug22
24-hr: C1 0414 UT Aug22
explanation | more data
Updated: Today at: 0620 UT

THE SOLAR WIND IS COMING: A stream of solar wind is approaching Earth. ETA: Aug. 25th.

The gaseous material is flowing from a northern hole in the sun's atmosphere and could cause polar geomagnetic unrest when it arrives.

Solar wind
speed: 300.5 km/sec
density: 16.0 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 1145 UT

X-ray Solar Flares
6-hr max: B1 1103 UT Aug23
24-hr: B6 1658 UT Aug22
explanation | more data
Updated: Today at: 1150 UT

Solar wind
speed: 299.4 km/sec
density: 14.5 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 0935 UT

X-ray Solar Flares
6-hr max: B1 0408 UT Aug24
24-hr: B1 1334 UT Aug23
explanation | more data
Updated: Today at: 0940 UT

EARTH'S MAGNETIC FIELD IS ABOUT TO BE UPSET: A solar wind stream and, possibly, two CMEs are approaching Earth. A direct hit by the stream on Aug. 25th followed by near-misses (or glancing blows) from the CMEs on Aug. 26th could spark 2 to 3 days of polar geomagnetic unrest. That's exciting because the Arctic Circle is getting dark enough for auroras. Read on...

Solar wind
speed: 341.7 km/sec
density: 19.7 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 2015 UT

X-ray Solar Flares
6-hr max: C1 1449 UT Aug24
24-hr: C1 1449 UT Aug24
explanation | more data
Updated: Today at: 2020 UT

POSSIBLE CME IMPACT THIS WEEK: A coronal mass ejection (CME) might hit Earth on Aug. 26-27. It left the sun on Aug. 23rd when a magnetic filament in the sun's northern hemisphere exploded.

In SOHO images, the CME looks like a faint expanding halo--a sign that it is heading almost directly for our planet. Geomagnetic unrest, and maybe minor geomagnetic storms, are possible when the CME arrives.

Solar wind
speed: 395.1 km/sec
density: 4.5 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 1825 UT

X-ray Solar Flares
6-hr max: B4 1602 UT Aug25
24-hr: C1 0124 UT Aug25
explanation | more data
Updated: Today at: 1830 UT

CHANCE OF STORMS, DOWNGRADED: NOAA analysts have determined that a CME launched by yesterday's "inky explosion" (described below) will sail east of the sun-Earth line, missing our planet. Another CME might still deliver a weak blow on Aug. 26-27. Overall, the chance of magnetic storms is less than before, albeit not zero.

Solar wind
speed: 398.6 km/sec
density: 5.4 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 0510 UT

X-ray Solar Flares
6-hr max: B2 2351 UT Aug25
24-hr: B4 1602 UT Aug25
explanation | more data
Updated: Today at: 0515 UT