Affichage des archives de vendredi, 28 janvier 2022

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2022 Jan 28 1235 UTC

Prévisions SIDC

Éruptions solaires

C-class flares expected, (probability >=50%)

Géomagnétisme

Quiet (A<20 and K<4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
28 Jan 2022	108	008
29 Jan 2022	108	007
30 Jan 2022	108	011

Bulletin

Solar activity was relatively quiet over the last 24 hours beside the number of bipolar sunspot groups visible on the disc. Several C-class flares were recorded and produced by the currently most active region: Catania bipolar sunspot group 17 (NOAA-AR 2936). The other sunspot groups did not show any significant flaring activity. Solar activity is expected to remain slightly active with possible C-class flares in the next 24 hours.

No Earth directed Coronal Mass Ejection (CME) has been detected in the available coronagraph imagery over the last 24 hours.

The greater than 10 MeV proton flux was at nominal levels in the past 24 hours and is expected to remain at nominal levels in the next 24 hours. The greater than 2 MeV electron flux remained below the 1000 pfu alert threshold and is expected to remain below the threshold in the next 24 hours. The greater than 2 MeV electron fluence dropped to nominal levels in the past 24 hours and is expected remained at nominal levels in the next 24 hours.

The solar wind parameters measured in the Earth environment (by DSCOVR) remained slightly enhanced under the influence of the effect from the solar high-speed stream connected to the Coronal Hole (positive magnetic polarity) that crossed the central meridian on January 21. The solar wind speed continued reached 543 km/s, the interplanetary magnetic field decreased to values below 5 nT, and its southward Bz-component fluctuated between -3.1 nT and 1.1 nT. The solar wind conditions are expected to slowly decreased. Then, the effect of the high-speed streams associated to the recurrent equatorial coronal hole facing Earth last January 26 (positive magnetic polarity) is expected to impact the solar wind conditions in about 1-2 days.

Geomagnetic conditions were quiet to unsettled (K_Bel 1-3) and at planetary levels (NOAA-Kp 1-3). Mainly quiet geomagnetic conditions are expected with possible short period of unsettled conditions in response to the high- speed streams from an equatorial Coronal Hole (that crossed the central meridian on January 21).

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 077, sur la base de 16 stations.

Indices solaires pour 27 Jan 2022

Nombre de Wolf, observé par Catania	095
Flux solaire à 10 cm	107
AK Chambon La Forêt	015
AK Wingst	008
Ap estimé	007
Nombre international de taches solaires estimé	080 - Basé sur 19 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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