Viewing archive of Tuesday, 20 August 2024

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2024 Aug 20 1232 UTC

SIDC Forecast

Solar flares

M-class flares expected (probability >=50%)

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
20 Aug 2024	240	006
21 Aug 2024	235	007
22 Aug 2024	235	008

Solar Active Regions and flaring

Solar flaring activity was moderate over the past 24 hours. The largest flare was a M3.7-flare, with peak time 21:52 UTC on August 19 2024, from NOAA AR 3796 (beta-gamma). There are currently 11 numbered active regions on the visible disk. NOAA AR 3784 is the most complex AR (beta-gamma-delta). The solar flaring activity is expected to be at moderate levels for the next 24 hours with C-class flares expected and M-class flares probable and a chance of X-class flares.

Coronal mass ejections

No new Earth-directed Coronal Mass Ejections (CMEs) have been detected in the available coronagraph images.

Coronal holes

A small negative polarity mid-latitude coronal hole started to cross the central meridian in the northern hemisphere. A high-speed stream from this coronal hole may enhance the solar wind environment near Earth on August 23.

Solar wind

The solar wind at the Earth remained slow over the last 24 hours. The solar wind speed decreased from around 400 km/s to around 350 km/s and the interplanetary magnetic field was stable around 7nT. The Bz reached a minimum value of -6nT. Slow solar wind conditions are expected in the next 24h.

Geomagnetism

Geomagnetic conditions were globally and locally quiet to unsettled (Kp 3+ and K Bel 3). Quiet conditions are expected in the next 24 hours.

Proton flux levels

The greater than 10 MeV proton flux remained below the 10 pfu threshold and is expected to remain so over the next days.

Electron fluxes at geostationary orbit

The greater than 2 MeV electron flux remained below the 1000 pfu alert threshold, and is expected to remain below the threshold during the next 24 hours. The 24h electron fluence was at normal levels and is expected to remain so.

Today's estimated international sunspot number (ISN): 221, based on 22 stations.

Solar indices for 19 Aug 2024

Wolf number Catania	204
10cm solar flux	239
AK Chambon La Forêt	024
AK Wingst	010
Estimated Ap	010
Estimated international sunspot number	232 - Based on 21 stations

Noticeable events summary

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

All times in UTC

<< Go to daily overview page