:Issued: 2026 Apr 19 1231 UTC :Product: documentation at http://www.sidc.be/products/meu #--------------------------------------------------------------------# # DAILY BULLETIN ON SOLAR AND GEOMAGNETIC ACTIVITY from the SIDC # # (RWC Belgium) # #--------------------------------------------------------------------# SIDC URSIGRAM 60419 SIDC SOLAR BULLETIN 19 Apr 2026, 1230UT SIDC FORECAST SOLAR FLARES : C-class flares expected, (probability >=50%) GEOMAGNETISM : Minor storm expected (A>=30 or K=5) SOLAR PROTONS : Quiet PREDICTIONS FOR 19 Apr 2026 10CM FLUX: 108 / AP: 032 PREDICTIONS FOR 20 Apr 2026 10CM FLUX: 108 / AP: 013 PREDICTIONS FOR 21 Apr 2026 10CM FLUX: 108 / AP: 007 Solar Active Regions and flaring: A total of 3 numbered sunspot groups were identified on the disk over the past 24 hours. Flaring activity has been very low, no C-class flares detected in the past 24 hours. The most complex region remains SIDC Sunspot Group 825 (NOAA Active Region 4419) currently located at N14W03 with a Beta-Gamma magnetic configuration. Low activity can be expected in the next 24 hours, with C-class falres likely. Coronal mass ejections: A CME was observed erupting towards the SE, first by LASCO C2 at 09:00 UTC on 18 February. This CME originated on a filament eruption centered around S40E40, with a speed around 350 km/s and angular of about 60 degrees, the bulk of the material was travelling to the south and will therefore most likely miss the Earth. Coronal holes: There is a large equatorial coronal hole with negative polarity in the western hemisphere (SIDC Coronal Hole 147). Solar wind: The Earth is still within the fast solar wind stream from SIDC Coronal Hole 147. The solar wind speed rose to close to 600 km/s, interplanetary magnetic field reached 18 nT with Bz down to -14 nT. Currently the speed is around 520 km/s with an interplanetary magnetic field magnitude of about 7 nT. Similar fast solar wind conditions can be expected for the next 24 hours. Geomagnetism: Geomagnetic conditions have reached moderate storm levels at planetary scale with Kp up to 6- and active levels locally with K_Bel up to 4. More disturbed periods are expected in the next 24 hours as the fast solar wind stream continues to pass. Proton flux levels: The greater than 10 MeV proton flux, as measured by GOES-18, was below the 10 pfu threshold level over the past 24 hours and is expected to remain so for the next 24 hours. Electron fluxes at GEO: The greater than 2 MeV electron flux, as measured by GOES-18 and GOES-19 was below the 1000 pfu alert threshold in the past 24 hours. The flux is expected to increase above the alert threshold over the next 24 hours. The 24-hour electron fluence was at normal levels over the past 24 hours and is expected to remain at these levels over the next 24 hours. TODAY'S ESTIMATED ISN : 040, BASED ON 17 STATIONS. SOLAR INDICES FOR 18 Apr 2026 WOLF NUMBER CATANIA : /// 10CM SOLAR FLUX : 106 AK CHAMBON LA FORET : 040 AK WINGST : 035 ESTIMATED AP : 037 ESTIMATED ISN : 045, BASED ON 26 STATIONS. NOTICEABLE EVENTS SUMMARY DAY BEGIN MAX END LOC XRAY OP 10CM Catania/NOAA RADIO_BURST_TYPES NONE END BT #--------------------------------------------------------------------# # Solar Influences Data analysis Center - RWC Belgium # # Royal Observatory of Belgium # # # # Website http://www.sidc.be. # # E-mail sidc-support@oma.be # # To unsubscribe http://www.sidc.be/registration/unsub.php # # # # Legal notices: # # - Intellectual Property Rights: # # http://www.astro.oma.be/common/internet/en/data-policy-en.pdf # # - Liability Disclaimer: # # http://www.astro.oma.be/common/internet/en/disclaimer-en.pdf # # - Use and processing of your personal information: # # http://www.astro.oma.be/common/internet/en/privacy-policy-en.pdf # #--------------------------------------------------------------------#