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Tägliches Bulletin zur solaren und geomagnetischen Aktivität des SIDC

Ausgestellt: 2025 Jun 29 1243 UTC

Vorhersage des SIDC

Sonneneruptionen

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

Geomagnetismus

Quiet (A<20 and K<4)

Sonnenprotonen

Quiet

	10cm Fluss	Ap
29 Jun 2025	123	010
30 Jun 2025	122	011
01 Jul 2025	121	029

Solaraktive Regionen und Flares

Solar flaring activity was low over the past 24 hours, with only C-class flares identified. The largest flare was a C4.0 flare (SIDC Flare 4771) peaking on June 28 at 19:54 UTC, which was produced by SIDC Sunspot Group 537 (NOAA Active Region 4126). During the flare, the source region (AR 4126) of the flare had beta configuration of its photospheric magnetic field. A total of 10 numbered sunspot groups were identified on the disk over the past 24 hours. The solar flaring activity is expected to be at low to moderate levels over the next 24 hours with C-class flares expected, M-class flares probable, and a small chance of X-class flares.

Koronaler Massenauswurf

A partial halo coronal mass ejection (CME) was first observed in SOHO/LASCO-C2 images around 21:00 UTC on Jun 28. It was associated with the C4.0 flare (peaked at 19:54 UTC on June 28) produced by SIDC Sunspot Group 537 (NOAA Active Region 4126). With its source region (N06 W21) closer to the central meridian, the corresponding ICME is expected to impact the Earth on Jul 01-02. No other Earth-directed CMEs were detected in the available coronagraph observations during last 24 hour.

Koronale Löcher

Recurrent negative polarity coronal hole (SIDC Coronal Hole 111) which spans from 20 to 40 S has started to cross the central meridian. The high speed streams originating from this coronal hole are expected to impact the Earth on Jul 02.

Sonnenwind

Over the past 24 hours, the solar wind parameters remained under the influence of high speed streams (HSSs) from the SIDC Coronal Hole 116 (negative polarity) which crossed the central meridian during Jun 21-25. The solar wind speed ranged between 495 km/s and 700 km/s. The North-South component (Bz) ranged between -4 and 5 nT. The interplanetary magnetic field ranged between 3 nT to 6 nT. In the next 24 hours, we expect a gradual transition from fast to slow solar wind.

Geomagnetismus

Geomagnetic conditions were globally at quiet (NOAA Kp 1 to 2) and locally at quiet to unsettled conditions (K_BEL 1 to 3). We expect quiet to unsettled conditions (K 1 to 3) in the next 24 hours.

Protonenflusswerte

The greater than 10 MeV GOES proton flux was below the threshold level over the past 24 hours and it is expected to remain so unless there is any major flare from the active regions near the W limb.

Elektronenflüsse im geostationären Orbit

The greater than 2 MeV electron flux, as measured by GOES-19 and GOES-18 satellites, remained above the 1000 pfu alert threshold level during the past 24 hours, in response to the high solar wind speed associated with the SIDC Coronal Hole 116 crossing the central meridian during Jun 21-25. The electron flux is expected to remain so during the next 24 hours. The 24h electron fluence was at moderate levels and is expected to remain so.

Die heute international geschätzte Sonnenfleckenanzahl (ISN): 149, basierend auf 25 Stationen.

Solarindizes für den 28 Jun 2025

Wolf-Zahl Catania	///
10cm Solarflux	122
AK Chambon La Forêt	014
AK Wingst	011
Geschätzer Ap-Wert	011
Geschätzte internationale Sonnenfleckenzahl	127 - Basierend auf 31 Stationen

Zusammenfassung auffälliger Ereignisse

Zur Verfügung gestellt vom Solar Influences Data Analysis Center© - SIDC - Verarbeitet von SpaceWeatherLive

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