Affichage des archives de jeudi, 22 février 2024

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2024 Feb 22 1231 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

Quiet (A<20 and K<4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
22 Feb 2024	174	008
23 Feb 2024	176	010
24 Feb 2024	178	008

Régions solaires actives et éruptions solaires

Solar flaring activity over the past 24 hours was at high levels, with two X-class flares and one M-class flare. The largest flare was a X1.8-flare, with peak time 23:07 UTC on February 21 and the second largest flare was a X1.7-flare, with peak time 06:32 UTC on February 22. Both flares were associated with NOAA AR 3590 (beta-gamma- delta). A M1.6-flare, with peak time 00:14 UTC on February 22 was produced by a yet unnumbered active region behind the east-limb on the southern hemisphere of the Sun. There are currently 2 numbered active regions on the visible disk. NOAA AR 3590 (beta-gamma-delta) is the largest and most magnetically complex region. NOAA AR 3586 (alfa) has been stable and inactive. The solar flaring activity is likely to be at moderate levels over the coming days with C-class flares expected and M-class flares possible and a low chance for an X-class flare.

Éjection de masse coronale

A south-east partial halo coronal mass ejection (CME) was observed in LASCO/C2 data around 16:12 UTC on February 21th. The eruption was related to an activity behind the east limb. No impact on Earth is expected. A second westward partial halo CME was detected in the LASCO/C2 data at 18:36 UTC on February 21th. The CME is associated with a filament eruption seen in SDO/AIA 304 & 193 at 17:37 on February 21th in the north-west quadrant of visible solar disk. The CME has an estimated plane-of-sky speed of around 450 km/s although the bulk of the ejection will miss Earth, a glancing blow arrival is possible on February 25th. A third south-east CME was detected in LASCO/C2 data around 00:24 UTC on February 22th, associated with the M1.6-flare peaking at 00:14 UTC on February 22.

Trous coronaux

Two negative polarity coronal holes have started to cross the central meridian. One in the northern half of the Sun at high latitude and the other in the Southern half at low latitude.

Vent solaire

Slow solar wind conditions were recorded over the past 24 hours. The solar wind speed fluctuated between 286 km/s to 377 km/s. The interplanetary magnetic field fluctuated between 5 nT and 8 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.

Géomagnétisme

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

Niveaux de flux de protons

Over the past 24 hours the greater than 10 MeV GOES proton flux was at nominal levels and is expected to remain so over the next days. Some enhancements are possible in the case of an eruptive activity from NOAA AR 3590.

Flux d'électrons sur l'orbite géostationnaire

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.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 053, sur la base de 08 stations.

Indices solaires pour 21 Feb 2024

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	170
AK Chambon La Forêt	007
AK Wingst	003
Ap estimé	003
Nombre international de taches solaires estimé	051 - Basé sur 15 stations

Résumé des événements marquants

Données fournies par le Solar Influences Data analysis Center© - SIDC - Traité par SpaceWeatherLive

Toutes les heures sont indiquées en UTC

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