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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2019 Jan 31 1242 UTC

SIDC Forecast

Brillamenti solari

Quiet conditions (<50% probability of C-class flares)

Geomagnetism

Minor storm expected (A>=30 or K=5)

Protoni solari

Quiet

	10cm flux	Ap
31 Jan 2019	074	017
01 Feb 2019	072	025
02 Feb 2019	070	011

Bulletin

No C-class flares in the past 24 hours, NOAA AR 2733 rotated over the west limb. There are no active regions visible. Eight B-class flares were observed (still from NOAA AR 2733), the strongest one was a B9.7 flare peaking at 17:05 UT on 30 January. Low solar activity is expected.

No Earth directed Coronal Mass Ejections (CMEs) have been detected. Solar protons have remained at background levels over the past 24 hours.

The solar wind speed is at 350 km/s with interplanetary magnetic fields of 14 nT. Geomagnetic conditions have been quiet. Solar wind density, speed, temperature and magnetic field have been increasing since last night, together with a sector boundary crossing (from positive to negative magnetic field polarity), marking the arrival of the fast solar wind associated with a negative polarity equatorial coronal hole. Disturbed geomagnetic conditions (most likely up to K=5) are expected for the next 48 hours.

Today's estimated international sunspot number (ISN): 000, based on 16 stations.

Solar indices for 30 Jan 2019

Wolf number Catania	012
10cm solar flux	074
AK Chambon La Forêt	005
AK Wingst	002
Estimated Ap	002
Estimated international sunspot number	000 - Based on 21 stations

Noticeable events summary

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

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