Het archief bekijken van dinsdag 28 juli 2026

Dagelijks bulletin over zonne- en geomagnetische activiteit van het SIDC

Datum verslag: 2026 Jul 28 1231 UTC

SIDC Prognose

Zonnevlammen

C-class flares expected, (probability >=50%)

Geomagnetisme

Quiet (A<20 and K<4)

Proton Flux monitor

Quiet

	10cm flux	Ap
28 Jul 2026	144	007
29 Jul 2026	140	013
30 Jul 2026	142	010

Zonnevlekkengebieden en zonnevlammen

Solar flaring activity was low over the past 24 hours, with only C-class flares identified. A total of 9 numbered sunspot groups were identified on the disk over the past 24 hours. SIDC Sunspot Group 886 (NOAA Active Region 4494) and SIDC Sunspot Group 923 (NOAA Active Region 4496) are the most magnetically complex regions on disk (both Beta). SIDC Sunspot Group 886 produced most of the flaring activity in the last 24 hours. SIDC Sunspot Group 927 (NOAA Active Region 4498) has rotated on the visible disk. The largest flare was a C5.1 flare (SIDC Flare 8288) peaking on July 28 at 03:19 UTC, which was produced by SIDC Sunspot Group 886. Solar flaring activity is expected to be low over the next 24 hours, with C-class flares very likely and a chance for M-class flares.

Coronale massa uitstoten

No Earth directed Coronal Mass Ejections (CMEs) were observed in the past 24 hours. Further analysis of the CME observed in LASCO-C2 data at 20:00 UTC on July 26 shows that the CME is not expected to impact the Earth. Further analysis of the CME observed in LASCO-C2 data at 11:00 UTC on July 27, which is associated with a filament eruption that was observed in SDO/AIA 304 at 04:32 UTC on July 27, shows a possible glancing blow arrival at Earth on July 30.

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

In the past 24 hours the solar wind parameters came under the influence of an ICME associated with a CME that left the sun on July 24. A shock in the solar wind was observed at 15:30 UTC on July 27. The solar wind speed jumped from 360 to 410 km/s and the solar wind density jumped from 0.4 to 4.3 particles/cm3. The total interplanetary magnetic field jumped from 5 to 8 nT. The total interplanetary magnetic field ranged from 4 to 9 nT over the period, with the Bz reaching a minimum of -6 nT. The phi-angle was in the negative sector (directed towards the Sun) with periods in the positive sector. The solar wind conditions are expected to return to slow solar wind conditions in the next 24 hours.

Geomagnetisme

The geomagnetic conditions were quiet to unsettled globally and locally quiet (Kp 1-3 K BEL 1-3) in the last 24 hours. Quiet to unsettleconditions 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 and GOES-19 satellites, were above the 1000 pfu threshold at the start of the period and dipped below the threshold around 00:00 UTC on July 28. The 2 MeV electron flux is expected to cross the threshold during the next 24 hour. The 24-hour electron fluence was at moderate levels and is expected to return to normal levels over the next 24 hours.

Het geschatte internationale zonnevlekkengetal (ISN) van vandaag: 105, gebaseerd op 19 stations.

Zon indexen voor 27 Jul 2026

Wolfgetal Catania	///
10cm zonneflux	147
AK Chambon La Forêt	014
AK Wingst	008
Geschatte Ap	007
Geschat internationaal zonnevlekkengetal	119 - Gebaseerd op 26 stations

Overzicht opvallende gebeurtenissen

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

Alle tijden in UTC

<< Keer terug naar de dagelijkse overview pagina