NOAA active region 1846/ Catania 79 produced a C1.1 flare on September 24. Although the chances for more C-flares are small, we end the all-quiet-alert.
ACE data show now a clear coronal hole signature. The solar wind plasma has a speed just below 450 km/s. It took this plasma around 4 days to bridge the distance Sun-Earth. On September 20, a northern coronal hole passed the central meridian. The co-rotating interaction region (CIR) followed by a fast wind measured by ACE, is probably linked to this hole. The CIR was responsible for 1 interval of Kp=4 on September 24. We expect quiet geomagnetic conditions, with Kp below 3.
(Info from Royal Observatory of Belgium).
Equipment: Coronado 90 + SBIG 8300s + LX75
Time GMT: 14:00
Exposure 0.09 sec.
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