Het archief bekijken van maandag 28 juli 2025

Dagelijks bulletin over zonne- en geomagnetische activiteit van het SIDC

Datum verslag: 2025 Jul 28 1237 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 2025	143	008
29 Jul 2025	141	013
30 Jul 2025	141	017

Zonnevlekkengebieden en zonnevlammen

Solar flaring activity was at low levels with low C-class flaring over the past 24 hours. A total of 11 numbered sunspot groups were identified on the visible solar disk most of them being small, simple and inactive. Most of the flaring activity, including a C3.1 flare (SIDC Flare 4958) with peak time 18:44 UTC on July 27, was produced by a returning region close to the east limb, namely SIDC Sunspot Group 555 (NOAA Active Regions 4141, 4161). SIDC Sunspot Group 570 (NOAA Active Region 4153) has also contributed to the low flaring activity over the past day, as well as SIDC Sunspot Group 572 (NOAA Active Region 4155), which has shown signatures of decay. All three active regions are classified as magnetic type beta. The solar flaring activity is expected to remain at low levels over the next 24 hours, with very likely C-class flares and a chance for M-class flares.

Coronale massa uitstoten

No Earth-directed coronal mass ejections (CMEs) have been identified in the available coronagraph imagery.

Coronale gaten

A mid-latitudinal negative polarity coronal hole (SIDC 121), which first crossed the central meridian on July 26, continues to reside there. High-speed stream related to SIDC 121 is expected to reach Earth on July 29.

Zonnewind

Over the past 24 hours the solar wind parameters (ACE and DSCOVR) have reflected nominal background slow solar wind conditions. The interplanetary magnetic field (B) was rather weak with magnitude below 3 nT and a minimum Bz of -3.6 nT. The solar wind speed was below 500 km/s. The B field phi angle was predominantly in the negative sector (directed towards the Sun). The solar wind conditions are expected to become elevated under the influence of a high speed stream starting from July 29.

Geomagnetisme

The geomagnetic conditions over the past 24 hours were globally quiet. Locally a single unsettled period was registered over Belgium between 18:00 and 19:00 UTC on July 27. Mostly quiet to unsettled geomagnetic conditions are expected for the next 24 hours. Active periods to isolated minor storms levels can be reached later on July 29 with an expected high speed stream arrival from a negative polarity coronal hole.

Proton flux niveaus

Over the past 24 hours the greater than 10 MeV GOES proton flux has been at nominal levels. The greater than 10 MeV GOES proton flux is expected to remain at nominal levels over the next days.

Elektronenfluxen in geostationaire baan

The greater than 10 MeV GOES 16 and GOES 18 electron fluxes were oscillating around the 1000 pfu threshold over the last 24 hours and are expected to continue to do so in the next 24 hours. The 24-hour electron fluence was at the border of nominal to moderate levels and is expected to remain so in the next 24 hours.

Het geschatte internationale zonnevlekkengetal (ISN) van vandaag: 133, gebaseerd op 15 stations.

Zon indexen voor 27 Jul 2025

Wolfgetal Catania	///
10cm zonneflux	145
AK Chambon La Forêt	008
AK Wingst	004
Geschatte Ap	004
Geschat internationaal zonnevlekkengetal	138 - Gebaseerd op 18 stations

Overzicht opvallende gebeurtenissen

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

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