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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2023 May 26 1316 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
26 May 2023	152	008
27 May 2023	150	003
28 May 2023	150	004

Solar Active Regions and flaring

Solar flaring activity over the past 24 hours has been at moderate levels with a single low M-class flare, namely an impulsive M1.1 flare, start time 14:37 UTC, peak time 14:46 UTC, end time 14:53 UTC, produced by NOAA AR 3312 (beta). The region has reduced its area and number of trailing sunspots. NOAA AR 3311 (beta-gamma) underwent significant decay and has produced only an isolated low C-class flaring. Multiple low C-class flaring was produced by NOAA AR 3315 (beta), which has increased its area and became the third largest active region after NOAA AR 3311 and NOAA AR 3310 (beta). The latter has developed a few more trailing spots and produced a single isolated low C-class flaring. The remaining flaring activity was produced by NOAA AR 3314 (beta), which lost half of its sunspots. A new active region (beta) has emerged near N10E42. It has been quiet and inactive. The solar flaring activity is expected to be at low levels over the next days with decreasing chances for M-class flaring.

Espulsioni di massa coronale

Multiple relatively narrow coronal mass ejections (CMEs) were observed to lift off the solar surface, but none is currently estimated to arrive at Earth. No Earth-directed CMEs were detected in the available coronagraph imagery.

Fori coronali

A narrow negative polarity is now crossing the central meridian. While no strong high speed stream arrival is expected, some enhancements in the solar wind near Earth could be observed on May 29th and May 30th.

Vento solare

Over the past 24 hours the solar wind parameters (ACE and DSCOVR) Solar wind parameters reflected the weakening influence of a high speed stream (HSS) from a negative polarity coronal hole. The solar wind velocity varied in the range of 426 km/s to 656 km/s. The interplanetary magnetic field remained weak with a maximum value of 6.6 nT and a minimum Bz of -6 nT. The B field was predominantly in the negative sector (directed towards the Sun). The solar wind conditions are expected to remain slightly elevated today and decline towards nominal slow solar wind levels over the next days.

Geomagnetism

The geomagnetic conditions over the past 24 hours were quiet to unsettled. Quiet to unsettled geomagnetic conditions are expected over the next 24 hours with slight chances for isolated active conditions. Mostly quiet conditions are expected thereafter.

Proton flux levels

Over the past 24 hours the greater than 10 MeV GOES proton flux was at nominal levels and is expected to remain so over the next days.

Electron fluxes at geostationary orbit

The greater than 2 MeV electron flux was above the 1000 pfu threshold for prolonged periods of time and is expected to remain so in the upcoming days. The 24h electron fluence was at moderate levels and is expected to remain at moderate levels over the next days.

Today's estimated international sunspot number (ISN): 140, based on 22 stations.

Solar indices for 25 May 2023

Wolf number Catania	///
10cm solar flux	152
AK Chambon La Forêt	///
AK Wingst	014
Estimated Ap	013
Estimated international sunspot number	148 - Based on 30 stations

Noticeable events summary

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

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