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Daily bulletin on solar and geomagnetic activity from the SIDC

Випущено: 2021 Apr 03 1312 UTC

SIDC Forecast

Сонячні спалахи

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

Geomagnetism

Quiet (A<20 and K<4)

Сонячні протони

Quiet

	10cm flux	Ap
03 Apr 2021	074	005
04 Apr 2021	074	007
05 Apr 2021	074	014

Bulletin

The solar activity has been quiet over the past 24 hours. The visible solar disc is spotless and the X-ray flux is below B-level. The solar activity is expected to remain at low levels over the next 24 hours.

No Earth-directed coronal mass ejections (CMEs) was observed in the available coronagraph imagery.

The greater than 10 MeV proton flux was at nominal levels over the past 24 hours and is expected to remain so for the next 24 hours. The greater than 2 MeV electron flux exceeded 1000 pfu threshold on April 02, between 17:15 UTC and 17:40 UTC. It is expected to remain mainly below the 000 pfu threshold during the next 24 hours. The 24h electron fluence was at nominal levels in the last 24 hours and is expected to stay at normal levels for the next 24 hours.

The solar wind parameters (ACE and DSCOVR) were slightly enhanced due to the influence of the speed streams associated with small patchy equatorial coronal holes (in the south hemisphere, with negative polarity): The solar wind speed ranged between 349 km/s and 409 km/s . The interplanetary magnetic field magnitude peaked at 9.0 nT, and Bz components varied between -7.5 nT and 6.6 nT. The high-speed streams associated with the equatorial coronal hole (positive magnetic polarity and facing Earth on March 31) is expected to slightly enhanced the solar wind conditions near Earth later today and tomorrow on April 3 and 4. A large equatorial coronal hole (with a positive magnetic polarity) is currently facing Earth. The high-speed stream associated with this coronal hole is expected to reach Earth in about 3 days.

Geomagnetic conditions were quiet to unsettle (Kp and K-Dourbes: 1-3) due to the slight enhancement of the solar wind conditions. Quiet to unsettled conditions is expected to persist followed by possible periods of active conditions on April 2, due to the expected influence of the high-speed streams associated with the equatorial coronal hole (facing Earth on March 31).

Today's estimated international sunspot number (ISN): 000, based on 18 stations.

Solar indices for 02 Apr 2021

Wolf number Catania	000
10cm solar flux	072
AK Chambon La Forêt	011
AK Wingst	007
Estimated Ap	006
Estimated international sunspot number	000 - Based on 32 stations

Noticeable events summary

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

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