Bulletin over de zonne- en geomagnetische activiteit — woensdag 29 juli 2026

Dagelijks bulletin over zonne- en geomagnetische activiteit van het SIDC

Datum verslag: 2026 Jul 29 1231 UTC

SIDC Prognose

Zonnevlammen

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

Geomagnetisme

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

Proton Flux monitor

Quiet

	10cm flux	Ap
29 Jul 2026	143	007
30 Jul 2026	142	011
31 Jul 2026	138	008

Zonnevlekkengebieden en zonnevlammen

A total of 9 numbered sunspot groups were identified on the disk over the past 24 hours. SIDC Sunspot Group 927 (NOAA Active Region 4498) is the largest and the most magnetically complex region on disk (Beta-Gamma) and produced most of the flaring activity in the last 24 hours. The largest flare was a C1.7 flare (SIDC Flare 8292) peaking on July 28 at 23:45 UTC, which was produced by SIDC Sunspot Group 927. Solar flaring activity is expected to be moderate over the next 24 hours, with C-class flares expected and M-class flares likely.

Coronale massa uitstoten

No Earth directed Coronal Mass Ejections (CMEs) were observed in the past 24 hours.

Coronale gaten

SIDC Coronal Hole 159 (mid-latitude coronal hole with a positive polarity), which first reached the central meridian on July 27 is continuing to cross the central meridian.

Zonnewind

Slow solar wind conditions were recorded over the past 24 hours. The solar wind speed ranged between 320 km/s to 404 km/s. The total interplanetary magnetic field ranged from 2 to 8 nT, with the Bz reaching a minimum of -5 nT. The phi-angle was in the negative sector (directed towards the Sun) until it switched to the positive sector at 07:50 UTC on July 29. The solar wind conditions are expected to become enhanced in the next 24 hours, due to the possible arrival of high-speed streams associated with SIDC Coronal Hole 159 and possible glancing blow arrival from a CME (SIDC CME 700) that left the Sun on July 27

Geomagnetisme

The geomagnetic conditions were quiet to unsettled globally (Kp 1-3) and locally reached active conditions (K BEL 4) in the last 24 hours. Active conditions are expected over the next 24 hours.

Proton flux niveaus

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

Elektronenfluxen in geostationaire baan

The greater than 2 MeV electron flux, as measured by the GOES-18 satellites, was above the 1000 pfu threshold between 17:00 UTC on July 28 between 21:20 UTC on July 28. The 2 MeV electron flux is expected to remain below the threshold during the next 24 hour. The 24-hour electron fluence was at normal levels and is expected to remain at normal levels over the next 24 hours.

Het geschatte internationale zonnevlekkengetal (ISN) van vandaag: 115, gebaseerd op 22 stations.

Zon indexen voor 28 Jul 2026

Wolfgetal Catania	139
10cm zonneflux	143
AK Chambon La Forêt	///
AK Wingst	013
Geschatte Ap	010
Geschat internationaal zonnevlekkengetal	110 - Gebaseerd op 29 stations

Overzicht opvallende gebeurtenissen

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