Viewing archive of Wednesday, 21 February 2024

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2024 Feb 21 1231 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
21 Feb 2024	150	008
22 Feb 2024	148	010
23 Feb 2024	146	010

Solar Active Regions and flaring

Solar flaring activity over the past 24 hours was at low levels. The largest flare was a C4.4-flare, with peak time 02:17 UTC on February 21, associated with a yet unnumbered active region behind the east-limb on the southern hemisphere of the Sun. There are currently 3 numbered active regions on the visible disk. NOAA AR 3590 (beta-gamma) is the largest and most magnetically complex region but has only produced minor C-class flares in the last 24 hours. NOAA AR 3586 (beta) has been stable and inactive. NOAA AR 3584 has decreased in size and is rotating over the west limb. The solar flaring activity is likely to be at low levels over the coming days with C-class flares expected and M-class flares possible.

Coronal mass ejections

No Earth directed Coronal Mass Ejections (CME)s, have been observed in the last 24 hours. Further analysis of the CME seen in LASCO C2 data one at 23:24 UTC on February 19, shows it is not expected to impact the Earth.

Solar wind

Slow solar wind conditions were recorded over the past 24 hours. The solar wind speed as measured by ACE, gently declined from around 460 km/s to around 270 km/s. The interplanetary magnetic field fluctuated between 2 nT and 9 nT, with the Bz reaching a minimum value of -6 nT. The phi-angle was in the positive sector (directed away the Sun) with periods on the negative sector. In the next 24-hours slow solar wind conditions are expected.

Geomagnetism

Geomagnetic conditions were globally and locally quiet (Kp 3 and K Bel 3) with some unsettled periods over the past 24 hours.

Proton flux levels

Over the past 24 hours the greater than 10 MeV GOES proton flux continued to decrease and, although still slightly elevated, remained below the 10 pfu threshold. The proton flux is expected to continue to decrease over the next 24 hours.

Electron fluxes at geostationary orbit

The greater than 2 MeV GOES 16 electron flux was below the 1000 pfu threshold and is expected to remain so in the upcoming days. The 24h electron fluence was at nominal level and is expected to remain so in the next days.

Today's estimated international sunspot number (ISN): 050, based on 11 stations.

Solar indices for 20 Feb 2024

Wolf number Catania	///
10cm solar flux	153
AK Chambon La Forêt	012
AK Wingst	007
Estimated Ap	006
Estimated international sunspot number	049 - 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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