Viewing archive of Saturday, 18 February 2017

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2017 Feb 18 1923 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

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

Solar protons

Quiet

	10cm flux	Ap
18 Feb 2017	075	013
19 Feb 2017	076	031
20 Feb 2017	078	019

Bulletin

Solar conditions have been quiet with X-ray flux at background levels. Catania group 93 (NOAA 2636) decayed slightly while a new region is appearing at the North Eastern limb. There is only a slight chance for C flares. No Earth directed CMEs have been observed in coronagraph data. Proton flux values are at background levels and expected to remain so.

Solar wind conditions remained enhanced under the positive polarity coronal hole influence. Solar wind speed saw a peak close to 600 km/s while magnetic field was in the 4-9nT range with a period of sustained negative Bz (down to -7nT) around midnight. Enhanced solar wind conditions will continue over the next days. Geomagnetic conditions were quiet to active (both NOAA Kp and local K Dourbes 1-4), with the active periods around midnight associated to the negative Bz values. Periods of active geomagnetic conditions remain possible over the next days.

Today's estimated international sunspot number (ISN): 011, based on 17 stations.

Solar indices for 17 Feb 2017

Wolf number Catania	012
10cm solar flux	075
AK Chambon La Forêt	038
AK Wingst	022
Estimated Ap	023
Estimated international sunspot number	013 - Based on 20 stations

Noticeable events summary

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

All times in UTC

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