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Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2023 Apr 02 1231 UTC

Prévisions SIDC

Éruptions solaires

Quiet conditions (<50% probability of C-class flares)

Géomagnétisme

Quiet (A<20 and K<4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
02 Apr 2023	125	013
03 Apr 2023	125	008
04 Apr 2023	125	005

Bulletin

Over the past 24 hours, the solar flaring activity was at very low levels with only one low C-class flare observed. Currently there are five numbered active regions on the visible side of the solar disk. All of these regions have simple configuration of their photospheric magnetic field (alpha or beta). We expect the solar flaring activity to stay at low levels for the next 24 hours, with a small possibility for C-class flares.

One halo CME has been observed by SOHO/LASCO C2 and C3 coronagraphs. It was seen for the first time at 12:36UT on April 1 in SOHO/LASCO C2 field of view. This CME was found to be back-sided and will not impact Earth.

The greater than 10MeV proton flux was at nominal levels over the past 24 hours and is expected to remain so. The greater than 2MeV electron flux has been above the threshold for most of the past 24 hours with a peak at 15:25 UT on April 1. Since 22:30UT on April 1 it has returned to background levels. We expect the greater than 2MeV electron flux to stay at background levels for the next 24 hours. The 24h electron fluence was at moderate levels over the past 24 hours. We expect this to go back to normal levels over the next 24 hours.

Over the past 24 hours the solar wind speed has stayed almost constant with values of about 520 to 580 km/s, characterised by the continued high speed stream (HSS) influence. The magnitude of the interplanetary magnetic field was about 5-7nT. We expect the solar wind speed will start to slowly decline over the next 24 hours as the influence of the HSS fades. Two small, negative polarity coronal holes have crossed the centre of the solar disk on March 31 and April 1 and are expected to start to influence the solar wind over the next 1-2 days. We do not expect a strong impact of the solar wind originating from these coronal holes.

During the last 24 hours, the geomagnetic conditions were mostly unsettled. A short interval of active conditions was reported by local station at Dourbes around 13:00 UT and 19:00 UT on April 1 (K was between 2 and 4), and by NOAA at around midnight on April 2 (Kp was between 3 and 4). Geomagnetic conditions are expected to stay unsettled for the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 043, sur la base de 10 stations.

Indices solaires pour 01 Apr 2023

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	125
AK Chambon La Forêt	031
AK Wingst	016
Ap estimé	016
Nombre international de taches solaires estimé	046 - Basé sur 12 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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