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Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2023 Jul 23 1240 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
23 Jul 2023	174	012
24 Jul 2023	170	009
25 Jul 2023	170	010

Régions solaires actives et éruptions solaires

Solar flaring activity over the past 24 hours was at low levels. The largest flare was a C9.9-flare, with peak time 04:54 UTC on July 23, produced by NOAA AR 3373 (beta), which is one of the most complex regions on disk but is also starting to decay. There are currently 7 numbered active regions on the visible disk including new numbered active region NOAA AR 3380 which has started to rotate on disk in the southern hemisphere. NOAA AR 3372 (beta), NOAA AR 3376 (beta) and NOAA AR 3379 (beta) are decaying. NOAA AR 3378 (alpha) and NOAA AR 3377 (beta) remained stable. The solar flaring activity is likely to remain at low levels over the coming days with C-class flares expected, M-class flares possible and a low chance for isolated X-class flaring.

Éjection de masse coronale

In SDO/AIA 304 a filament was observed erupting in the north-east quadrant around 16 UTC on July 22 producing an on-disk dimming. However, no clear Coronal Mass Ejection (CME) signature has been identified as this was quickly followed by two eruptions in the north-east quadrant obscuring the CME. In LASCO/C2 coronagraph data from 21:24 UTC on July 22 two eruptions were seen to the east and the north-east likely associated with these two eruptions near to NOAA AR 3379. The filament eruption is still being analysed as it may have an Earth directed component due to the source location it may have an Earth directed component. The CMEs to the north and north east are not expected to impact Earth. The previously mentioned CME associated with the M3.2-flare on July 22 is not expected to arrive at Earth.

Trous coronaux

The negative polarity coronal hole is still transiting the central meridian in the northern hemisphere. Two small positive polarity mid latitude coronal holes one in the north and one in the south are approaching the central meridian.

Vent solaire

Over the past 24 hours the solar wind parameters (ACE and DSCOVR) reflected the waning influence of the ICME. The solar wind velocity fluctuated between 400 km/s to 480 km/s. The interplanetary magnetic had a maximum value of 8 nT going to 6 nT by the end of the period. Bz had a minimum value of -5 nT. The magnetic field orientation was predominantly in the negative sector (field directed towards from the Sun). Slow solar wind conditions are expected in the next two days with small enhancements possible due to the High-Speed Stream (HSS) associated with a negative polarity coronal hole.

Géomagnétisme

The geomagnetic conditions over the past 24 hours were quiet (NOAA KP = 2 and K-Bel = 2). Quiet to unsettled conditions are expected over the next two days.

Niveaux de flux de protons

The greater than 10 MeV proton flux was at background levels over the last 24 hours and is expected to remain at background levels in the next 24 hours.

Flux d'électrons sur l'orbite géostationnaire

The greater than 2 MeV electron flux measured by GOES-16 and GOES-18 stayed below the 1000 pfu alert threshold and is currently at background levels. The greater than 2 MeV electron flux is not expected to cross the threshold in the next 24 hours. The 24h electron fluence was at nominal levels and is expected to remain at nominal levels in the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 135, sur la base de 08 stations.

Indices solaires pour 22 Jul 2023

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	174
AK Chambon La Forêt	011
AK Wingst	010
Ap estimé	010
Nombre international de taches solaires estimé	136 - Basé sur 20 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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