Viewing archive of Monday, 23 September 2024

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2024 Sep 23 1231 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
23 Sep 2024	163	007
24 Sep 2024	163	007
25 Sep 2024	163	032

Solar Active Regions and flaring

Solar flaring activity over the past 24 hours was moderate. There are seven numbered regions on the visible solar disc with NOAA ARs 3828 (beta-gamma), 3831 (beta) and 3835 (beta) being the most active in the last 24 hours. NOAA AR 3835 produced the strongest flare of the day, an M3.7 flare with peak at 21:39 UTC on 22 September. The solar flaring activity is likely to remain at moderate over the coming days, with more M-class flares possible.

Coronal mass ejections

A partial halo CME with apparent angular width around 180 degrees erupted on 22 September at 21:37 UTC (first seen by LASCO C2), with a speed of around 1300 km/s. It is directed to the southeast but it has an Earth component that could hit the Earth around 6:00 UTC on 25 September, according to EUHFORIA.

Coronal holes

A small equatorial positive polarity coronal hole crossed the central meridian on 21 September. A mild high speed stream may arrive at Earth on 25 September.

Solar wind

Over the past 24 hours the solar wind parameters (ACE and DSCOVR) were indicative of a slow solar wind regime. The interplanetary magnetic field was below 9 nT with a minimum Bz of -6 nT. The solar wind velocity decreased to about 380 km/s. Similar slow wind conditions are expected to continue for the next 24 hours.

Geomagnetism

The geomagnetic conditions over the past 24 hours were quiet both globally and locally (Kp and K_Bel from 0 to 2). Similar conditions are expected for the next 24 hours.

Proton flux levels

Over the past 24 hours the greater than 10 MeV GOES proton flux has been at nominal levels and is expected to remain so over the next 24 hours.

Electron fluxes at geostationary orbit

The greater than 2 MeV electron flux as measured by GOES 16 and GOES 18 has been slightly above the 1000 pfu threshold on 22 September. It is expected to be below threshold over the next 24 hours. The 24h electron fluence was at normal levels and is expected to remain so over the next 24 hours.

Today's estimated international sunspot number (ISN): 134, based on 13 stations.

Solar indices for 22 Sep 2024

Wolf number Catania	///
10cm solar flux	163
AK Chambon La Forêt	011
AK Wingst	005
Estimated Ap	004
Estimated international sunspot number	143 - Based on 11 stations

Noticeable events summary

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

All times in UTC

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