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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2021 Sep 16 1231 UTC

SIDC Forecast

Valid from 1230 UTC, 16 Sep 2021 until 18 Sep 2021
Brillamenti solari

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

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

10cm fluxAp
16 Sep 2021076001
17 Sep 2021074001
18 Sep 2021076007

Bulletin

The solar activity was at very low levels with no C-class flare activity over the past 24 hours. The only significant feature observable from Earth is NOAA plage 2870 who is not expected to produce any C-class flares. There is a small chance of C-class activity from a returning active region for the next 24 hours.

No Earth-directed CMEs were detected in the available coronagraph imagery over the past 24 hours.

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 2MeV electron flux was below the 1000 pfu threshold and is expected to remain so in the next 24 hours. The 24h fluence for the greater than 2MeV electron flux was at nominal levels and is expected to remain so in the next 24 hours.

The Solar Wind (SW) parameters measured by ACE and DSCOVR are typical of the slow wind regime. The SW speed dropped from 430 to 310 km/s over the last 24 hours. The total magnetic field (Btot) varied 0.9 and 5.2 nT and the Bz magnetic field component varied between -3.5 and 3.7 nT during the past 24 hours. The interplanetary magnetic field was mainly positive (directed away from the Sun) during the last 24 hours. The solar wind parameters are expected to remain in the slow SW regime in the next 24 hours.

The geomagnetic conditions over the past 24 hours were globally and locally quiet (NOAA Kp index and K Dourbes 1-2). They are expected to become quiet both globally and locally in the next 24 hours.

Today's estimated international sunspot number (ISN): 000, based on 21 stations.

Solar indices for 15 Sep 2021

Wolf number Catania011
10cm solar flux075
AK Chambon La Forêt008
AK Wingst006
Estimated Ap006
Estimated international sunspot number011 - Based on 18 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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