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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2021 Mar 24 1230 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
24 Mar 2021	079	007
25 Mar 2021	082	007
26 Mar 2021	082	007

Bulletin

Solar activity was at very low levels in the past 24 hours. NOAA AR 2811 and Catania group 81 produced only minor B-class flares. A new small active region that rotated into view has been numbered by NOAA as AR 2812 (alpha magnetic field configuration). Solar activity is expected to remain at low levels, with a small chance of a C-class flare.

A Coronal Mass Ejection (CME) was observed on 22 March, 01:10 UT. It has an Earth-directed component and its speed is estimated to 250-300 km/s. It is expected to reach Earth on 26 March.

An equatorial negative polarity coronal hole crossed the central meridian, its associated high speed stream will arrive at the Earth in about 3 days.

The greater than 10 MeV proton flux was below nominal levels over the past 24 hours and is expected to remain so for the next 24 hours. The greater than 2 MeV electron flux exceeded the 1000 pfu threshold in the past 24 hours and is expected to remain elevated in the next 24 hours. The 24h electron fluence was at moderate levels in the last 24 hours and is expected to remain at moderate levels in the next 24 hours.

The solar wind speed decreased from 500 km/s to 420 km/s. The interplanetary magnetic field magnitude varied between 1 and 5 nT. Bz was between 3 and -4 nT. The magnetic field phi angle showed alternating polarity. Slow solar wind conditions are expected in the next 24 hours.

Geomagnetic conditions were quiet to unsettled, Kp varied between 2 and 3 and local K Dourbes between 1 and 3 over the past 24 hours. The CME observed on 20 March could still arrive today and cause at most active conditions (otherwise mostly quiet conditions expected).

Today's estimated international sunspot number (ISN): 027, based on 16 stations.

Solar indices for 23 Mar 2021

Wolf number Catania	///
10cm solar flux	079
AK Chambon La Forêt	019
AK Wingst	013
Estimated Ap	012
Estimated international sunspot number	025 - Based on 20 stations

Noticeable events summary

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

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