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Daily bulletin on solar and geomagnetic activity from the SIDC

Существующий: 2023 Apr 04 1232 UTC

SIDC Forecast

Солнечные вспышки

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

Geomagnetism

Quiet (A<20 and K<4)

Солнечные протоны

Quiet

	10cm flux	Ap
04 Apr 2023	135	012
05 Apr 2023	137	012
06 Apr 2023	135	005

Bulletin

During last 24 hours the solar flaring activity was very low with only several B-class and low C-class flares reported. Majority of the flaring activity originated from the NOAA AR 3270 which continues to increase in the sunspot area and in the complexity of its photosperic magnetic field configuration. The NOAA AR 3270 is presently classified as the complex beta-gamma-delta region and as such it is potential source region for the C-class and even M-class flares in the coming hours. The NOAA AR 3266 became also more complex during last hours, and it has now beta configuration of its photospheric magnetic filed. This region could also be the source of the C-class flaring activity in the coming hours.

The partial halo CME was observed in the morning of April 03, first time seen in the SOHO/LASCO C2 field of view at 07:36 UT. The CME’s velocity was about 300 km/s (as reported by CACTUS software), and its angular width was about 200 degrees. No clear on-disc signatures of the CME are visible in the presently available data. Therefore, we conclude that this was probably back-side event and as such this CME will not arrive to Earth.

The greater than 10 MeV proton flux remained at the background levels, and the greater than 2 MeV electron flux was fluctuating around the 1000 pfu threshold. The 24h electron fluence continues to be at moderate to normal level. We do not expect change in these three parameters in the coming 24 hours.

During last 24 hours the solar wind velocity was fluctuating between about 500 and 530 km/s. The interplanetary magnetic field magnitude is around 5 nT. Earth might be already under the influence of the solar wind originating from the two small negative polarity coronal holes reported on April 2, and whose impact was expected starting from today. However, this is not fully clear from the presently available in situ observations.

During last 24 hours the geomagnetic conditions were quiet to unsettled (NOAA reported Kp=3+ this morning. We expect such a geomagnetic conditions to persist in the coming hours.

Today's estimated international sunspot number (ISN): 072, based on 17 stations.

Solar indices for 03 Apr 2023

Wolf number Catania	///
10cm solar flux	134
AK Chambon La Forêt	026
AK Wingst	014
Estimated Ap	016
Estimated international sunspot number	062 - Based on 27 stations

Noticeable events summary

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

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