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Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2022 Apr 08 1232 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
08 Apr 2022	106	012
09 Apr 2022	102	007
10 Apr 2022	102	019

Bulletin

Solar activity was at very low to low levels with a single C-class flare over the past 24 hours. There are five simple active regions on the visible solar disk. NOAA 2978 (beta) has undergone further decay significantly decreasing its number of sunspots and is now approaching the west limb together with NOAA 2981 (beta). Active region NOAA 2985 has slightly increased its complexity and is now classified as magnetic type beta. NOAA 2983 has decayed into plage and a nearby simple region, Catania sunspot group 73, has produced an impulsive C1.0-class flare with peak time 11:21 UT. A new simple unipolar active region was numbered in the south- east quadrant, NOAA 2987 (alpha). The X-ray flaring activity is expected to be at very low to low levels for the next 24 hours with 50% probability for isolated C-class flaring.

No other Earth-directed coronal mass ejections (CMEs) were detected in the available coronagraph imagery over the past 24 hours.

The greater than 10 MeV proton flux was at nominal levels in the past 24 hours and is expected to remain so in the next 24 hours. The greater than 2 MeV electron flux has decreased under he 1000 pfu threshold is remain under the 1000 pfu threshold for the next 24 hours. The 24h electron fluence was at moderate levels over the past 24 hours and is expected to return to nominal levels in the next 24 hours.

Over the past 24 hours the solar wind parameters (ACE and DSCOVR) registered more signatures of the ICME arrival reported yesterday and most probably have remained under the influence of a flank of the halo CME related to the filament eruption on April 3rd. The solar wind parameters reflected a rather weak shock around 3:38 UT this morning with minor increase in the solar wind velocity, density and magnetic field. The solar wind density remained slightly enhanced. The solar wind velocity showed some decline, varying in the range of 345 to 422 km/s. The interplanetary magnetic field was further enhanced to 10.6 nT, with a weakly affected Bz component showing a minimum of -6.7 nT. The B field orientation was changing from negative to positive sector and back to negative (directed towards the Sun). The solar wind parameters are expected to return to background slow solar wind conditions over the next 24 hours.

The geomagnetic conditions over the past 24 hours were locally quiet to unsettled and globally registered an active period between 09-12 UT on Aril 7th. Mostly quiet to unsettled geomagnetic conditions are expected for the next 24 hours with decreasing chances for isolated active periods. The high speed stream from the geo-effective mid-latitude negative polarity coronal holes is expected to reach Earth late on April 9th and could result in unsettled to active geomagnetic conditions with some chances for a minor geomagnetic storm on April 10th.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 048, sur la base de 11 stations.

Indices solaires pour 07 Apr 2022

Nombre de Wolf, observé par Catania	085
Flux solaire à 10 cm	111
AK Chambon La Forêt	019
AK Wingst	010
Ap estimé	013
Nombre international de taches solaires estimé	049 - Basé sur 26 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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