Affichage des archives de vendredi, 29 juillet 2022

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2022 Jul 29 1232 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

Active conditions expected (A>=20 or K=4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
29 Jul 2022	094	029
30 Jul 2022	095	031
31 Jul 2022	095	010

Bulletin

Only a single C flare was observed. The C4.2 flare peaked at 4:33UTC from the new bipolar region (NOAA active region 3068) after some flux emergence in its intermediate region. The region was otherwise quiet, and all other active regions on disc were showing signs of decay, with NOAA active regions 3066 and 3067 loosing their spots. Some new spot formation in the north-west quadrant was observed but it remains to be confirmed that it persists. Flaring at C level is not very likely but remains quite possible over the next days.

At least the most southern part of the filament located south of NOAA active region 3062 has erupted starting around 22UTC. However, no associated CMEs could be identified in coronagraph data. No Earth directed CME's have been observed in coronagraph data.

The greater than 10 MeV proton flux was at background levels and is expected to remain so. The greater than 2 MeV electron flux just briefly touched the 1000 pfu alert threshold. The 24h electron fluence was at normal levels and is expected to be at normal levels following a slow declining trend.

A small coronal hole of positive polarity located just to the north of the equator that crossed the central meridian on July 26 is expected to influence Solar wind from today onwards.

Slow Solar wind conditions were observed. Solar wind speed decreased steadily from around 400km/s to around 325km/s. The interplanetary magnetic field had a magnitude of between 5-8nT with a variable north-south component. The interplanetary magnetic field is connected to a negative sector (field towards the Sun). We are expecting today a switch into the positive sector (field away from the Sun), followed by an increase in Solar wind speed associated to the high speed stream from the isolated coronal hole that crossed the central meridian on July 26.

Geomagnetic conditions were quiet to unsettled (NOAA Kp 1-2 and local K Dourbes 1-3) with an isolated active period observed by local K Dourbes. Active conditions are expected over the next days associated to the interaction region and high speed stream from the isolated coronal hole that crossed the central meridian on July 26. Isolated minor geomagnetic storm episodes can not be excluded.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 047, sur la base de 21 stations.

Indices solaires pour 28 Jul 2022

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	093
AK Chambon La Forêt	013
AK Wingst	009
Ap estimé	009
Nombre international de taches solaires estimé	045 - Basé sur 31 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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