Het archief bekijken van dinsdag 26 augustus 2025

Dagelijks bulletin over zonne- en geomagnetische activiteit van het SIDC

Datum verslag: 2025 Aug 26 1231 UTC

SIDC Prognose

Zonnevlammen

M-class flares expected (probability >=50%)

Geomagnetisme

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

Proton Flux monitor

Warning condition (activity levels expected to increase, but no numeric forecast given)

	10cm flux	Ap
26 Aug 2025	175	020
27 Aug 2025	180	016
28 Aug 2025	182	007

Zonnevlekkengebieden en zonnevlammen

Solar flaring activity was moderate over the past 24 hours, with 4 M-class flares identified. The largest flare was a M4.5 flare (SIDC Flare 5237) peaking on August 26 at 05:25 UTC, which was produced by SIDC Sunspot Group 614 (NOAA Active Region 4197). That region and SIDC Sunspot Group 617 (NOAA Active Region 4199), both located close to the east limb, are driving most of the activity. Solar flaring activity is expected to be moderate over the next 24 hours, with M-class flares likely and a small chance for X-class flares.

Coronale massa uitstoten

No Earth-directed Coronal Mass Ejections (CMEs) have been observed in the last 24 hours.

Coronale gaten

SIDC Coronal Hole 126 (northern mid-latitude coronal hole with negative polarity) is located in the western hemisphere and its related high speed solar wind stream may arrive to the Earth in the next 24 hours.

Zonnewind

The Earth is inside slow solar wind with speeds around 400 km/s and interplanetary magnetic fields of about 5 nT (directed towards the Sun, negative polarity). A high speed solar wind stream is expected to arrive in the next 24 hours, with probably only mild effects.

Geomagnetisme

Geomagnetic conditions have been quiet to unsettled (Kp and B_Bel between 0 and 3). Similar conditions are expected until the arrival of the high speed solar wind stream in the next 24 hours (mostly active conditions expected then).

Proton flux niveaus

The greater than 10 MeV proton flux has continued to increase slowly and has almost reached the 10 pfu threshold, without going above it (currently at 9 pfu). A warning condition forecast is issued for the next 48 hours.

Elektronenfluxen in geostationaire baan

The greater than 2 MeV electron flux as measured by GOES 18 and 19 remained below the 1000 pfu alert threshold (except for a minimal crossing of the threshold between 13:00 and 26:00 UTC on 25 August, in GOES 19), similar conditions expected for the next 24 hours. The 24 h electron fluence was at normal levels and is expected to remain so.

Het geschatte internationale zonnevlekkengetal (ISN) van vandaag: 184, gebaseerd op 23 stations.

Zon indexen voor 25 Aug 2025

Wolfgetal Catania	125
10cm zonneflux	175
AK Chambon La Forêt	016
AK Wingst	011
Geschatte Ap	009
Geschat internationaal zonnevlekkengetal	139 - Gebaseerd op 32 stations

Overzicht opvallende gebeurtenissen

Aangeboden door het Solar Influences Data Analysis Center© - SIDC - Verwerkt door SpaceWeatherLive

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