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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2016 Dec 25 1337 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

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

Protoni solari

Quiet

	10cm flux	Ap
25 Dec 2016	072	022
26 Dec 2016	071	013
27 Dec 2016	071	009

Bulletin

Solar activity was very low in the past 24 hours. No flares, no coronal mass ejections were observed. One NOAA Halpha plages 2619 and one NOAA active region (AR) 2620 are rotating across the west solar limb, while one returning NOAA AR is expected to appear at the east solar limb in the next 24 hours. Solar protons have remained at background levels. Solar activity is expected to remain low over the next 24 hours with a small chance of B-class flares. The solar wind speed was stable over the past 24 hours, varying around 630 km/s. The total magnetic field strength has fluctuated between 7.5 nT and 4.5 nT. The Bz component has fluctuated between -6 nT and +7 nT. Geomagnetic conditions were ranged between Kp index 2-4 (NOAA) and local K index 1-4 (Dourbes), with the singular enhance value from Dourbes K=4 (starting at 12:00 UT today, 25-12-2016). The solar wind variations are still enhanced due to the fast solar wind stream from the coronal hole, as a consequence geomagnetic conditions are expected to be active to unsettled to for the next two days (Kp index <= 4). A minor storm (Kp = 5) is not excluded.

Today's estimated international sunspot number (ISN): 000, based on 12 stations.

Solar indices for 24 Dec 2016

Wolf number Catania	///
10cm solar flux	073
AK Chambon La Forêt	025
AK Wingst	015
Estimated Ap	015
Estimated international sunspot number	000 - Based on 16 stations

Noticeable events summary

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

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