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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2015 Jan 26 1224 UTC

SIDC Forecast

Brillamenti solari

Eruptive (C-class flares expected, probability >=50%)

Geomagnetism

Active conditions expected (A>=20 or K=4)

Protoni solari

Quiet

	10cm flux	Ap
26 Jan 2015	130	020
27 Jan 2015	133	011
28 Jan 2015	136	010

Bulletin

Only 2 minor C-class flares were observed during the last 24 hours. The strongest was a C1.8 flare peaking at 06:27UT in steadily growing NOAA 2271. Some new flux emerged in the trailing portion of NOAA 2268. Both this region and NOAA 2271 have some mixed magnetic polarities. The other regions were quiet. No Earth-directed CMEs were observed. A 20 degree long filament near the solar equator is at W30 and thus in a geoeffective position in case of eruption. C-class flaring is expected, with a chance on an isolated M-class flare. A disturbance in the solar wind was recorded starting 25 January around 20:00UT. Bz fluctuated between +9 and -15 nT, wind speed increased slightly and varied between 350 and 400 km/s. Elevated particle densities (20-40 particles per cm3) were observed between 05:00UT and 10:00UT. This may herald the arrival of a CH HSS, but further data are required to confirm this. Both Kp as K Dourbes recorded active geomagnetic conditions. A small equatorial CH transited the CM on 25 January and may influence the geomagnetic field late on 28 January. The geomagnetic field is expected to be unsettled to active.

Today's estimated international sunspot number (ISN): 076, based on 06 stations.

Solar indices for 25 Jan 2015

Wolf number Catania	///
10cm solar flux	127
AK Chambon La Forêt	013
AK Wingst	007
Estimated Ap	006
Estimated international sunspot number	048 - Based on 15 stations

Noticeable events summary

Provided by the Solar Influences Data analysis Center© - SIDC - Processed by SpaceWeatherLive

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