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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2022 May 22 1232 UTC

SIDC Forecast

Brillamenti solari

C-class flares expected, (probability >=50%)

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
22 May 2022	167	013
23 May 2022	165	012
24 May 2022	162	005

Bulletin

Solar flaring activity was low during the last 24 hours with seven C-class flares detected. Most of the activity came from NOAA AR 3010 (magnetic type Beta, Catania group 11) and NOAA Active Region (AR) 3014 (magnetic type Beta-Gamma-Delta, Catania group 14) with the latter retaining its magnetic complexity and all its Greek letters. C-class activity is almost certain to continue in the next 24 hours and there is good chance of an isolated M-class flare.

A partial halo CME automatically detected by CACTus on 21 May 16:00 UT is a back-sided event and is not expected to affect Earth.

The greater than 10 MeV proton flux was at 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 remained below the 1000 pfu alert threshold and is expected to remain below this threshold during the next 24 hours. The 24h electron fluence was at nominal levels and is expected to remain so.

The Solar Wind (SW) conditions (as measured by the DSCOVR and ACE satellites) feature a slow return to a typical slow SW regime. The SW speed dropped from 550 to 450 km/s in the last 24 hours. During the same period the total magnetic field was very low with values between 2 and 6 nT, while its Bz component varied between -5 and 5 nT. The interplanetary magnetic field phi angle was predominantly positive (directed away from the Sun) during the last 24 hours. The solar wind conditions are expected to continue their gradual return to the slow SW regime in the next 24 hours.

Geomagnetic conditions were globally and locally active (NOAA Kp 0-4 and K Dourbes 1-4) in the last 24 hours.They are expected to become moderate during the next 24 hours.

Today's estimated international sunspot number (ISN): 166, based on 18 stations.

Solar indices for 21 May 2022

Wolf number Catania	///
10cm solar flux	167
AK Chambon La Forêt	023
AK Wingst	014
Estimated Ap	014
Estimated international sunspot number	149 - Based on 23 stations

Noticeable events summary

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

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