Flaring activity increased slightly during the past 24 hours, with two C-class flares. A C1.1 flare erupted from Catania sunspot group 35 (NOAA AR 2050) and peaked at 1:26 UT on 30 April. Also a C1.5 flare was detected (peak at 6:20 UT on 30 April), and SDO imagery indicates Catania sunspot group 33 (NOAA AR 2047) as source. Catania sunspot group 33 produced a B9 flare peaking at 22:54 UT on 29 April. The B9 flare was accompanied by a coronal dimming, which indicates the occurrence of CME. A CME was observed in LASCO/C2 with first measurement at 00:24 UT on 30 April. Further analysis of this CME will be carried out, once more data are available. A filament eruption (centered at around E20N25) was visible in PROBA2/SWAP and SDO imagery, starting at 8:27 UT on 30 April. More C-class flares are possible during the next 48 hours. Solar wind observations of ACE indicated the arrival of a transient near 19:30 UT on 29 April. There is no clear signature of the arrival of the expected coronal hole high-speed stream.
Solar wind speed (near 300 km/s) is still low. The magnitude of the interplanetary magnetic field currently is around 10 nT, with a south-directed vertical component. This lead to a few time slots with unsettled geomagnetic conditions, which is expected to continue for the next few hours. Quiet geomagnetic conditions are expected from 1 May on.
Equipment: Coronado 90 + Imaging Source DMK + LX75
Processing: Photoshop, Avistack 300 frames
Time UT: 15:00
Exposure 1/500 sec.
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