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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Feb 22 1230 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
22 Feb 2017	085	011
23 Feb 2017	085	031
24 Feb 2017	085	031

Bulletin

Solar activity was low with NOAA region 2638 (Catania groups 95 and 96), the only active region on disk, producing several B flares of which the strongest of magnitude B6.8 peaking at 1:51UT. The region appears to be fairly simple and flaring is expected to remain at B level. No Earth directed CMEs have been observed in coronagraph data. The proton flux values are at background levels and expected to remain so.

Solar wind speed fluctuated in the 400-450 km/s range. Total magnetic field gradually increased from 4nT to around 7nT. There was a period of persistent positive Bz and fluctuation in the magnetic field phi angle following a drop in temperature around 15:30 UT. But otherwise Bz was variable with negative peaks not lower than -5nT and the magnetic field phi angle stable in the positive sector. Solar wind speed is expected to pick up by tomorrow February 23 reaching around 600 km/s under the influence of the equatorial positive polarity coronal hole. Geomagnetic conditions have been quiet to unsettled (local K Dourbes 1-3) with an isolated active period around midnight (only NOAA Kp 4). Over the next days active conditions are likely with also minor geomagnetic storms possible due to the expected high speed stream.

Today's estimated international sunspot number (ISN): 028, based on 09 stations.

Solar indices for 21 Feb 2017

Wolf number Catania	050
10cm solar flux	083
AK Chambon La Forêt	015
AK Wingst	005
Estimated Ap	004
Estimated international sunspot number	027 - Based on 19 stations

Noticeable events summary

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

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