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Daily bulletin on solar and geomagnetic activity from the SIDC

Datum verslag: 2023 Mar 27 1231 UTC

SIDC Forecast

Zonnevlammen

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

Geomagnetism

Quiet (A<20 and K<4)

Proton Flux monitor

Quiet

	10cm flux	Ap
27 Mar 2023	175	002
28 Mar 2023	173	003
29 Mar 2023	170	005

Bulletin

Over the past 24 hours, the solar flaring activity has been at low levels with nine low C-class flares observed. There are nine numbered active regions observed on the visible side of the solar disk. Most of the flaring activity originated from Catania group 24 (NOAA AR 3256) which has a beta-gamma configuration of the photospheric magnetic field and is currently the most complex active region on the visible side of the solar disk. All other regions have an alpha or beta configuration of their photospheric magnetic field. The solar flaring activity is expected to remain at low levels over the next 24 hours with C-class flares expected and a very small possibility of M-class flares.

During the last 24 hours there were no potentially Earth-directed coronal mass ejections detected in the available coronagraph observations.

The greater than 10 MeV proton flux was at nominal levels over the past 24 hours. The greater than 2 MeV electron flux has been around the 1000 pfu threshold since March 27 00:25UT, barely crossing the threshold and continues to remain so. We expect it will remain around the 1000 pfu threshold over the next 24 hours. The 24h electron fluence was at nominal levels and is expected to remain so over the next 24 hours.

The solar wind parameters of the last 24 hours still reflect conditions of the high speed stream that arrived on the 25th of March. The solar wind speed increased to values of up to about 650 km/s. Starting from 16:00UT on the 27th of March, it declined towards values of about 570km/s. The interplanetary magnetic field strength was about 6-7 nT during the last 24 hours. We expect the solar wind speed and magnetic field to stay enhanced as long as Earth resides in the high speed stream. From early March 30 onwards, we are expecting the arrival of another high speed stream, associated with the negative polarity, equatorial coronal hole which started to cross the central meridian today.

During the last 24 hours, the geomagnetic conditions were quiet with the K and Kp values between 1-2 as reported by the local station at Dourbes and NOAA, respectively. Geomagnetic conditions are expected to remain quiet in the coming hours.

Today's estimated international sunspot number (ISN): 156, based on 21 stations.

Solar indices for 26 Mar 2023

Wolf number Catania	///
10cm solar flux	159
AK Chambon La Forêt	011
AK Wingst	009
Estimated Ap	008
Estimated international sunspot number	149 - Based on 11 stations

Noticeable events summary

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

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