Viewing archive of Saturday, 25 February 2017

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2017 Feb 25 1230 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
25 Feb 2017	082	023
26 Feb 2017	082	017
27 Feb 2017	081	010

Bulletin

Solar activity was very quiet with no significant flaring. NOAA region 2638 (Catania group 96) slightly decayed while the new Catania group 97 (NOAA 2639) remained a simple alpha region. No C flares are expected on the coming days. A Westbound CME with angular width around 110 degrees is visible in SoHO/LASCO coronagraph data from 22:12 UT onwards but is judged to be a backside event. Proton flux values are at background levels and expected to remain so.

Solar wind parameters indicated the continued but slowly declining influence of the high speed stream. Solar wind speed slowly declined from around 600 km/s to close to 500 km/s. Total magnetic field was at nominal 3-5nT levels with Bz variable. Solar wind will initially remain enhanced but continue its decline towards nominal conditions over the next days. Geomagnetic conditions declined from active at the start of the period (NOAA Kp 4) to quiet to unsettled throughout the rest of the period (local K Dourbes 1-3 and NOAA Kp 2-3). Geomagnetic conditions are expected to be quiet to unsettled with an active period initially still possible.

Today's estimated international sunspot number (ISN): 032, based on 16 stations.

Solar indices for 24 Feb 2017

Wolf number Catania	054
10cm solar flux	082
AK Chambon La Forêt	022
AK Wingst	020
Estimated Ap	020
Estimated international sunspot number	022 - Based on 30 stations

Noticeable events summary

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

All times in UTC

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