Solar prominence observed at eastern limb
Solar activity was at low levels. The largest event during last 48 hours was a long duration C1 solar flare with a large prominence erupted on September 23 around 15:56 UTC from an area behind the eastern limb. It produces CME cloud with no threat to Earth.
Some activity can be expected from the Sunspot 1575 which is growing and has at the moment beta-gama configuration. Sunspot 1577 is growing fast and might give C-class and M-class flares. NOAA/SWPC forecasters estimate a 10% chance of an eruption during the next 24 hours. Any CME produced at this time would be Earth-directed. The remaining regions were quiet and stable.
ACE satellite measurements indicated a steady decline in wind speed from about 400 km/s to near 350 km/s while the Bz component of the interplanetary magnetic field did not vary much beyond +/- 4 nT. A solar wind stream flowing from coronal hole should reach Earth on Sept 23/24. There are no large coronal holes so the geomagnetic field is expected to be at predominately quiet levels for the next three days.
CURRENT CONDITIONS:
Solar wind
speed: 353.3 km/sec
density: 3.1 protons/cm3
The Radio Sun
10.7 cm flux: 125 sfu
Planetary K-index
Now: Kp= 0 quiet
24-hr max: Kp= 1 quiet
Interplanetary Mag. Field
Btotal: 3.3 nT
Bz: 2.7 nT north
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