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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2021 Feb 18 1230 UTC

SIDC Forecast

Valid from 1230 UTC, 18 Feb 2021 until 20 Feb 2021
Brillamenti solari

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

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

10cm fluxAp
18 Feb 2021073003
19 Feb 2021074004
20 Feb 2021075007

Bulletin

The solar activity has been quiet over the past 24 hours. One small bipolar sunspot (Catania 72) has just emerged on the visible solar disc, however, no significant flaring activity was recorded. The solar activity is expected to remain at low levels over the next 24 hours with small chances of C-class flare from the newly emerged sunspot.

No Earth-directed coronal mass ejections was observed in the available coronagraph imagery.

The greater than 10 MeV proton flux was at nominal levels in the past 24 hours and is expected to remain so in the next 24 hours. The greater than 2 MeV electron flux remained under the 1000 pfu threshold and is expected to remain so in the next 24 hours.

Over the past 24 hours, the solar wind speed decreased from 460 km/s to 400 km/s. The total magnetic field was around 5 nT and the Bz component ranged between -5.6 nT and 3.2 nT. The solar wind conditions are expected to return towards a slow solar wind speed regime the next day. A large equatorial coronal hole with negative magnetic polarity and located in the southern hemisphere is currently facing Earth. The high-speed streams associated with this coronal hole is expected to impact the solar wind environment near Earth in about 3 days.

The geomagnetic conditions over the past 24 hours were quiet with few short periods of unsettled condition. It is expected to remain quiet for the next day.

Today's estimated international sunspot number (ISN): 011, based on 14 stations.

Solar indices for 17 Feb 2021

Wolf number Catania000
10cm solar flux072
AK Chambon La Forêt012
AK Wingst///
Estimated Ap008
Estimated international sunspot number000 - Based on 21 stations

Noticeable events summary

DayBeginMaxFineLocStrengthOP10cmCatania/NOAARadio burst types
Nessuna

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

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Ultimo brillamento M2025/04/30M1.9
Ultima tempesta geomagnetica2025/04/21Kp5+ (G1)
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