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Daily bulletin on solar and geomagnetic activity from the SIDC

Випущено: 2023 Mar 26 1231 UTC

SIDC Forecast

Сонячні спалахи

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

Geomagnetism

Active conditions expected (A>=20 or K=4)

Сонячні протони

Quiet

	10cm flux	Ap
26 Mar 2023	160	012
27 Mar 2023	160	011
28 Mar 2023	160	004

Bulletin

Solar flaring activity over the past 24 hours was low levels with multiple low C-class flares mostly from NOAA AR 3263 (beta) and NOAA AR 3262 (alpha), but also from NOAA AR 3264 (alpha), NOAA AR 3259 (beta) and NOAA AR 3256 (beta-gamma). There are eight numbered active regions on the visible solar and a new region has immersed to the south-east of NOAA AR 3260 (beta). NOAA 3256 remains the largest and most complex region. NOAA 3258 (beta) has shows slight development, as well as NOAA 3263. The solar flaring activity is expected to be at low levels over the next 24 hours.

No Earth-directed coronal mass ejections (CMEs) have been detected in the limited available coronagraph imagery.s

The greater than 10 MeV GOES proton flux was at nominal levels over the past 24 hours and is expected to remain so in the next 24 hours. The greater than 2 MeV electron flux has been below the1000 pfu threshold and is expected to reach the 1000 pfu threshold over the next 24 hours. The 24h electron fluence was at nominal levels and is expected to be at the borer of nominal to moderate levels over the next 24 hours.

Over the past 24 hours the solar wind parameters (ACE and DSCOVR) reflected the ongoing high speed stream (HSS) arrival, reported on March 25th. The solar wind velocity varied in the range of 498 to 618 km/s. The interplanetary magnetic field (B) was relatively weak with a maximum value of 8 nT and a minimum Bz of -5.3 nT. The B field was predominantly in the negative sector (directed towards the Sun) reflecting the polarity of the geo-effective coronal hole, which produced the HSS. The solar wind density was mostly around 10 ppcc. The solar wind parameters over the next 24 hours are expected to remain enhanced under the influence of the ongoing HSS arrival.

The geomagnetic conditions over the past 24 hours were quiet to unsettled. Predominantly quiet to active geomagnetic conditions are expected for the next 24 hours with possible isolated minor storms due to the ongoing high speed stream.

Today's estimated international sunspot number (ISN): 140, based on 05 stations.

Solar indices for 25 Mar 2023

Wolf number Catania	///
10cm solar flux	160
AK Chambon La Forêt	024
AK Wingst	014
Estimated Ap	014
Estimated international sunspot number	150 - Based on 19 stations

Noticeable events summary

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

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