Viewing archive of Wednesday, 5 April 2023

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2023 Apr 05 1231 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
05 Apr 2023	135	011
06 Apr 2023	133	008
07 Apr 2023	130	005

Bulletin

Despite the presence of the complex NOAA AR 3270 on the visible side of the solar disc (classified yesterday as the beta-gamma-delta region), the solar flaring activity was during last 24 hours very low with only few B-class and low C-class flares reported. The NOAA AR 3270 shows decrease in complexity and it has now beta-gamma configuration of the photospheric magnetic field. We expect a low level of flaring activity to persist in the coming hours with C-class flares, while isolated M-class flares are possible but not very probable.

During last 24 hours there were no potentially Earth-directed CMEs detected in the coronagraph observations.

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, we expect both of these parameters will stay on the similar level in the coming hours. The 24h electron fluence is still at moderate to normal level, and we expect it to decrease to the normal level until tomorrow.

Earth is still withing the rather fast solar wind. During last 48 hours the solar wind velocity was fluctuating between about 530 and 490 km/s, with the present value around 480 km/s. The interplanetary magnetic field magnitude is around 5 nT.

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): 059, based on 16 stations.

Solar indices for 04 Apr 2023

Wolf number Catania	082
10cm solar flux	136
AK Chambon La Forêt	015
AK Wingst	014
Estimated Ap	013
Estimated international sunspot number	069 - Based on 25 stations

Noticeable events summary

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

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