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Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2023 Aug 23 1231 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 Aug 2023	151	007
24 Aug 2023	153	007
25 Aug 2023	155	007

Régions solaires actives et éruptions solaires

There are eight active regions visible on the disk, a new region rotated over the east limb (NOAA AR 3415). They all have simple alpha or beta magnetic field configuration. An M1.1 flare occurred on 22 August, with peak at 23:04 UTC, from NOAA AR 3405. C-class flares are expected and M-class flares are possible in the next 24 hours.

Éjection de masse coronale

A wide CME (angular width around 80 degrees) erupted to the west, first seen at 19:00 UTC on 22 August by LASCO-C2. The source region of this CME is slightly backsided and thus the CME will not arrive to the Earth. About 1 hour later, a faint CME could be seen erupting towards the southeast, related to dimmings seen on EUV around NOAA ARs 3405 and 3411 (this activity is also related to the M1.1 flare from NOAA AR 3405). Due to the location of the dimmings (close to disk center), a possible arrival to the Earth of this faint CME cannot be discarded (on 26 August). Later on, one more faint CME erupted from NOAA AR 3404, in the vicinity of the previous eruption and first seen at 02:00 UTC by LASCO-C2. This last CME will most likely not affect Earth (although more data will be investigated as it becomes available).

Vent solaire

The Earth is inside a slow solar wind stream, with speed around 430 km/s and an interplanetary magnetic field around 5 nT. The interplanetary magnetic field orientation was predominantly in the negative sector (field directed towards the Sun). Similar conditions can be expected in the next 24 hours.

Géomagnétisme

During the last 24 hours the geomagnetic conditions were quiet (NOAA KP 1-2, K Bel 1-2). Similar conditions can be expected for the next 24 hours.

Niveaux de flux de protons

Over the past 24 hours the greater than 10 MeV GOES proton flux was at nominal levels and is expected to remain so over the next 24 hours.

Flux d'électrons sur l'orbite géostationnaire

The greater than 2 MeV electron flux remained below the 1000 pfu threshold as measured by GOES 16. It is expected to remain so in the next 24 hours. The 24 hour electron fluence was at normal levels and is expected to remain so.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 105, sur la base de 23 stations.

Indices solaires pour 22 Aug 2023

Nombre de Wolf, observé par Catania	127
Flux solaire à 10 cm	151
AK Chambon La Forêt	010
AK Wingst	008
Ap estimé	008
Nombre international de taches solaires estimé	119 - Basé sur 28 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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