Viewing archive of Tuesday, 10 August 2021

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2021 Aug 10 1230 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
10 Aug 2021	074	011
11 Aug 2021	074	005
12 Aug 2021	074	004

Bulletin

Solar flaring activity was at very low levels. No significant flares have been recorded. Solar activity is expected to remain at very low levels.

No Earth directed Coronal Mass Ejections (CMEs) were observed in the available coronagraphic 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, while the 24h electron fluence was at nominal levels over the past 24 hours. Over the next 24 hours they may increase slightly.

The solar wind parameters indicate we are possibly under the influence of the anticipated high speed stream associated with the negative polarity coronal hole crossing central meridian Aug 5. Over the past 24 hours the solar wind speed increased up to 450 km/s. The total magnetic field strength had values between 1 and 9 nT, while its Bz component varied between -6 and 7 nT. The interplanetary magnetic field phi angle was predominantly on the negative sector (directed towards the Sun). Over the next 24 hours, solar wind conditions are expected to remain at about these levels.

Geomagnetic conditions were at quiet to unsettled levels (NOAA Kp 0-2 and K Dourbes 0-3) over the past 24 hours. Quiet to unsettled conditions are expected over the next 24 hours.

Today's estimated international sunspot number (ISN): 000, based on 24 stations.

Solar indices for 09 Aug 2021

Wolf number Catania	012
10cm solar flux	073
AK Chambon La Forêt	008
AK Wingst	005
Estimated Ap	004
Estimated international sunspot number	007 - Based on 33 stations

Noticeable events summary

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

All times in UTC

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