SIDC Ursigram

:Issued: 2025 Sep 07 1231 UTC
:Product: documentation at http://www.sidc.be/products/meu
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# DAILY BULLETIN ON SOLAR AND GEOMAGNETIC ACTIVITY from the SIDC     #
# (RWC Belgium)                                                      #
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SIDC URSIGRAM 50907
SIDC SOLAR BULLETIN 07 Sep 2025, 1230UT
SIDC FORECAST 
SOLAR FLARES  : M-class flares expected (probability >=50%)
GEOMAGNETISM  : Active conditions expected (A>=20 or K=4)
SOLAR PROTONS : Quiet
PREDICTIONS FOR 07 Sep 2025  10CM FLUX: 144 / AP: 013
PREDICTIONS FOR 08 Sep 2025  10CM FLUX: 142 / AP: 008
PREDICTIONS FOR 09 Sep 2025  10CM FLUX: 140 / AP: 007

Solar Active Regions and flaring: Solar flaring activity was moderate over
the past 24 hours, with 1 M-class flare identified. The largest flare was a
M1.2 flare (SIDC Flare 5442) peaking on September 06 at 22:15 UTC, which
was produced by SIDC Sunspot Group 624 (NOAA Active Region 4207). A total
of 9 numbered sunspot groups were identified on the disk over the past 24
hours. SIDC Sunspot Group 624 (NOAA Active Region 4207) is the largest and
most magnetically complex (Beta-Gamma) region on disk and produced most of
the flaring activity in the last 24 hours. Solar flaring activity is
expected to be moderate over the next 24 hours, with M-class flares likely
and a small chance for X-class flares.

Coronal mass ejections: No Earth-directed Coronal Mass Ejections (CMEs)
have been detected in the available coronagraph images.

Solar wind: Over the past 24 hours the solar wind conditions at Earth were
disturbed, due to the arrival of a coronal mass ejection (CME) associated
with a faint halo CME observed in SOHO/LASCO-C3 images on September 04, and
the ongoing influence of a high-speed stream (HHS) associated with SIDC
Coronal Hole 123. On September 06 at 13:50 UTC the solar wind speed jumped
from 501 km/s to 620 km/s and the total interplanetary magnetic field
jumped from 10 nT to 22 nT. Over the entire period the Bz reached a minimum
of -10 nT. At the end of the period the solar wind speed is around 520 km/s
and the total interplanetary magnetic field is around 9 nT. The phi-angle
was mainly in the positive sector (directed away from the Sun), with
periods in the negative sector. The solar wind conditions are expected to
remain enhanced in the next 24 hours, due to the waning influence of the
ICME and the high-speed stream.

Geomagnetism: The geomagnetic conditions over the past 24 hours reached
minor storm conditions globally and locally (Kp 5 & K BEL 5). Active
conditions are expected for the next 24 hours.

Proton flux levels: Over the past 24 hours, the greater than 10 MeV GOES
proton was at background levels and is expected to remain so over the next
days.

Electron fluxes at GEO: The greater than 2 MeV electron flux, as measured
by the GOES-18 and GOES-19 satellites, were below the 1000 pfu threshold in
the last 24 hours. The 2 MeV electron flux is expected to cross 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.





Zdroj : SIDC Ursigram





Předpověď sluneční aktivity pro období : September 05 - September 11, 2025

Zdroj : http://www.asu.cas.cz/~sunwatch




Poslední fotografie ze SOHO / SDO:



Různé barvy snímků prozrazují odlišné vlnové délky - každá
vlnová délka je vyzařována plynem o určité teplotě: oranžová: 80 000 °C,
modrá: 1 000 000 °C, zelená: 1 500 000 °C, hnědá: 2 500 000 °C.

  

    




      He II/Si XI 30,4 nm

      80 000 °C

      EIT 304

    
    





      Fe IX/X 17,1 nm

      1 000 000 °C

      EIT 171

    
    





      Fe XII 19,5 nm

      1 500 000 °C

      EIT 195

    
    





      Fe XV 28,4 nm

      2 500 000 °C

      EIT 284

    
  
  

    




SDO/HMI Continuum


    





SDO/HMI Magnetogram


    





LASCO C2


    




LASCO C3

  










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