Viewing archive of Friday, 24 February 2017

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2017 Feb 24 1235 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
24 Feb 2017	084	028
25 Feb 2017	084	031
26 Feb 2017	084	029

Bulletin

Solar activity was low with NOAA region 2638 (Catania group 96) producing two more C flares. The strongest a C1.3 flare peaking at 20:53UT. The group evolved into a beta-gamma configuration while also some new small spots are recorded elsewhere on the Solar disk (Catania groups 97 and 98). Another C flare from NOAA region 2638 is quite possible but not expected. A narrow CME directed to the North East is visible in SoHO/LASCO coronagraph data from 23:53 after a datagap. It is possibly related to the C flaring from NOAA region 2638, but is anyway directed off the sun-Earth line. Proton flux values are at background levels and expected to remain so.

Solar wind was enhanced under influence of the positive polarity coronal hole high speed stream. Solar wind speed continued to increase and now fluctuates around 620 km/s. Total magnetic field fluctuated around 11nT until 4:00UT when it dropped to nominal values of around 5nT. Bz was variable with peaks down to -10nT. Solar wind conditions are expected to remain enhanced over the next 48 hours. Geomagnetic conditions were quiet to active (local K Dourbes 2-4) with an episode of minor storm conditions at planetary level (NOAA Kp 5 for the 0-3UT period). Active geomagnetic conditions are possible over the next days under influence of the high speed stream.

Today's estimated international sunspot number (ISN): 020, based on 20 stations.

Solar indices for 23 Feb 2017

Wolf number Catania	028
10cm solar flux	083
AK Chambon La Forêt	023
AK Wingst	015
Estimated Ap	013
Estimated international sunspot number	021 - Based on 23 stations

Noticeable events summary

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

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