Viewing archive of Monday, 9 August 2021

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2021 Aug 09 1236 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
09 Aug 2021	074	010
10 Aug 2021	074	013
11 Aug 2021	074	005

Bulletin

Over the past 24 hours, a C1.3 class flare has taken place, originating from Catania region 29. The solar activity is expected to remain at low levels, with a small change of C class flares over the next 24 hours.

No Earth-directed coronal mass ejections have been 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. They are expected to likely remain so during the next 24 hours.

Over the past 24 hours the solar wind speed fluctuated between 330 and 390 km/s. The total magnetic field strength had values between 1 and 8 nT, while its Bz component varied between -6 and 5 nT. The interplanetary magnetic field phi angle was predominantly on the positive sector (directed away from the Sun), until Aug 9 08:00UT when it switched to the negative sector. Over the next 24 hours, solar wind conditions could possibly be slightly enhanced, due to the expected high speed stream associated with the negative polarity coronal hole crossing central meridian Aug 5.

Geomagnetic conditions were at quiet to unsettled levels (NOAA Kp 1-2 and K Dourbes 1-3) over the past 24 hours. Quiet to active conditions are expected over the next 24 hours.

Today's estimated international sunspot number (ISN): 010, based on 20 stations.

Solar indices for 08 Aug 2021

Wolf number Catania	///
10cm solar flux	074
AK Chambon La Forêt	009
AK Wingst	006
Estimated Ap	005
Estimated international sunspot number	000 - Based on 24 stations

Noticeable events summary

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

All times in UTC

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