Since the X3.3 flare yesterday, the NOAA AR 1890 (no Catania number yet) produced only C-class flares, the strongest one being the C8.6 flare peaking at 08:51 UT today. Nevertheless, this active region still keeps the beta-gamma-delta configuration of its photospheric magnetic field. We expect further strong flaring from this region, primarily on the M-level. Another X-class flare is also probable. Given that the NOAA AR 1890 is approaching the solar central meridian, we maintain the warning condition for a proton event. The Earth is currently inside a slow (around 350 km/s) solar wind flow with average (around 5 nT) interplanetary magnetic field magnitude. The geomagnetic conditions are quiet and are expected to remain so.
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Equipment: Coronado 90 + SBIG 8300s + LX75
Time GMT: 13:00
Exposure 0.12 sec.
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NOAA AR 1890 (no Catania number yet) produced today an M2.5 flare peaking at 08:18 UT, and a C8.0 flare peaking at 11:58 UT. We expect the flaring activity at the M-level, with a small chance for an X-class flare. A CME was associated with the M2.5 flare, first appearing in the LASCO C2 field of view at 08:24 UT. The data currently available do not allow yet to measure the full angular width of the CME. However, STEREO and LASCO data clearly show that the bulk of the material is ejected southward of the ecliptic plane, so we do not expect the arrival of the corresponding interplanetary disturbance at the Earth. The proton flux at energies above 10 MeV measured by GOES exhibited a small increase around 08:40 UT today, probably associated with the M2.5 flare and corresponding CME. The proton flux remains below the threshold, but we issue a warning condition for a proton event. The Earth is currently inside a slow (around 360 km/s) solar wind flow with average (around 4 nT) interplanetary magnetic field magnitude. The geomagnetic conditions are quiet and are expected to remain so.