Viewing archive of Tuesday, 6 April 2021

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2021 Apr 06 1233 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

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

Solar protons

Quiet

	10cm flux	Ap
06 Apr 2021	072	008
07 Apr 2021	072	006
08 Apr 2021	072	005

Bulletin

The solar activity has been very low over the past 24 hours. Active Region NOAA 12813 (Mag. type:Axx) is further decaying, with a smaller, spotless, region present in the South-Eastern part of the visible disk. The solar activity is expected to remain at low levels over the next 24 hours.

No Earth-directed coronal mass ejections were observed in the available coronagraph imagery.

The greater than 10 MeV proton flux was at background levels in the past 24 hours, and is expected to stay at nominal levels in the next 24 hours. The greater than 2 MeV electron flux remained below the 1000 pfu alert threshold. It is expected to remain so during the next 24 hours. The 24h electron fluence was at nominal levels and is expected to remain so.

The solar wind speed has fluctuated between 300 and 345 km/s over the past 24 hours. The total magnetic field strength has fluctuated between 3 nT and 9 nT. The Bz component decreased sharply to about -7 nT around April 5 09:30UT, smoothly increasing for the rest of the 24-hour window. The interplanetary magnetic field phi angle was predominantly in the positive sector (directed away from the Sun). The values recorded for the solar wind parameters indicate the possible passage of a magnetic cloud, starting around April 5 09:30UT. We are therefore anticipating the influence from the high speed stream associated with the southern positive Coronal Hole, which was on Central Meridian on April 3, over the next 24 hours. As a response, over the next 24 hours the solar wind parameters are expected to increase.

Geomagnetic conditions were mostly at quiet levels with isolated unsettled periods (NOAA Kp 0-3 and local K Dourbes 0-2) over the past 24 hours. Quiet to unsettled conditions are expected for the next 24-hour period, with a very slight chance of active conditions, due to the arrival of the aforementioned high-speed stream.

Today's estimated international sunspot number (ISN): 006, based on 27 stations.

Solar indices for 05 Apr 2021

Wolf number Catania	///
10cm solar flux	072
AK Chambon La Forêt	007
AK Wingst	004
Estimated Ap	004
Estimated international sunspot number	011 - Based on 25 stations

Noticeable events summary

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

All times in UTC

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