As of this update, the solar wind speed as measured by the ACE spacecraft is 584.7 km/s, and the Bz component of the interplanetary magnetic field is pointing north +13.3 nT. Several hours of geomagnetic storming was observed yesterday evening following the X1.6 CME impact, including a brief period of Strong G3 storming at higher latitudes (KP=7). A geomagnetic storm watch remains in effect for today, although the Bz/IMF component would have to switch to a south pointing orientation for this to become more likely.
The anticipated coronal mass ejection (CME) generated by the X1.6 solar flare on September 10th swept past Earth at 15:55 UTC Friday. Solar Wind speeds as measured by the ACE spacecraft increased from 433.2 km/s, to 671.8 km/s. A Geomagnetic Sudden Impulse measuring 43 nT was detected by the ground based magnetometer in Boulder, Colorado. Moderate G2 geomagnetic storming was observed at high latitudes, with a brief period of Strong G3 storming detected as well. The Bz component of the interplanetary magnetic field (IMF) has since pointed north, a condition that is known to suppress geomagnetic activity. A geomagnetic storm watch will remain in effect on Saturday.