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Tägliches Bulletin zur solaren und geomagnetischen Aktivität des SIDC

Ausgestellt: 2026 May 17 1231 UTC

Vorhersage des SIDC

Sonneneruptionen

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

Geomagnetismus

Quiet (A<20 and K<4)

Sonnenprotonen

Quiet

	10cm Fluss	Ap
17 May 2026	108	015
18 May 2026	110	007
19 May 2026	113	025

Solaraktive Regionen und Flares

Solar flaring activity was moderate over the past 24 hours, with four M-class flares. The strongest flares were two M1.9 flares: SIDC Flare 7718, peaking at 16:12 UTC on May 16, which was associated with the returning SIDC Sunspot Group 825 (NOAA Active Region 4436, magnetic type beta), and SIDC Flare 7714, peaking at 17:42 UTC on May 16, which was associated with SIDC Sunspot Group 844 (NOAA Active Region 4435). There are currently seven numbered active regions on the solar disk, with all regions classified as magnetic type beta or alpha. SIDC Sunspot Groups 871 and 872, both magnetic type beta, emerged in the southeast quadrant, while SIDC Sunspot Group 870 (NOAA Active Region 4441, magnetic type beta) emerged in the northeast quadrant. SIDC Sunspot Group 844 (NOAA Active Region 4435) has rotated across the west limb. The 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.

Koronaler Massenauswurf

A wide and fast Coronal Mass Ejection (SIDC CME 656) was observed in LASCO/C2 and C3 coronagraph imagery starting from around 16:36 UTC on May 16, directed mainly toward the northwest. The CME is associated with an M1.9 flare peaking at 16:12 UTC on May 16 from SIDC Sunspot Group 825 (NOAA Active Region 4436), with associated dimming and field line movement observed in SDO/AIA data. Type IV radio emission was detected from 16:05 UTC on May 16, associated with this event. Preliminary analysis suggests that the CME has a fitted speed around 1200 km/s. Although the bulk of the ejecta appears to be directed mainly toward the northwest, preliminary modelling indicates that a glancing blow is expected at Earth around May 19. No other Earth-directed CMEs were observed in the available coronagraph imagery.

Sonnenwind

Over the past 24 hours, the solar wind parameters (ACE) reflected enhanced solar wind conditions under the waning influence of the high-speed stream from the large, negative polarity transequatorial coronal hole (returning SIDC Coronal Hole 147). Speed values ranged between 620 km/s and 730 km/s. The interplanetary magnetic field values ranged between 2 nT and 5 nT. The Bz component varied between -5 nT and 4 nT. Solar wind conditions are expected to gradually return towards a slow solar wind regime over the next 24 hours.

Geomagnetismus

Geomagnetic conditions globally reached minor storm levels between 15:00 UTC and 18:00 UTC on May 16 (NOAA Kp 5- ), before returning to mostly quiet levels towards the end of the period. Locally, geomagnetic conditions reached active levels during several intervals at the beginning of the period (K BEL 4), before returning to mostly quiet levels towards the end of the period. Mostly quiet geomagnetic conditions are expected over the next 24 hours.

Protonenflusswerte

The greater than 10 MeV proton flux was below the 10 pfu threshold level over the past 24 hours. It is expected to remain below the threshold level over the next 24 hours.

Elektronenflüsse im geostationären Orbit

The greater than 2 MeV electron flux measured by GOES 18 and GOES 19 was below the 1000 pfu threshold until around 16:00 UTC on May 16 and exceeded the threshold afterwards. The greater than 2 MeV electron flux is expected to remain around or above the 1000 pfu threshold levels in the next 24 hours. The 24-hour electron fluence was initially at normal levels and reached moderate levels for the rest of the period. It is expected to remain at moderate levels over the next 24 hours.

Die heute international geschätzte Sonnenfleckenanzahl (ISN): 092, basierend auf 14 Stationen.

Solarindizes für den 16 May 2026

Wolf-Zahl Catania	///
10cm Solarflux	109
AK Chambon La Forêt	033
AK Wingst	031
Geschätzer Ap-Wert	034
Geschätzte internationale Sonnenfleckenzahl	055 - Basierend auf 18 Stationen

Zusammenfassung auffälliger Ereignisse

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

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