:Issued: 2026 Jul 15 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 60715 SIDC SOLAR BULLETIN 15 Jul 2026, 1230UT SIDC FORECAST SOLAR FLARES : Quiet conditions (<50% probability of C-class flares) GEOMAGNETISM : Active conditions expected (A>=20 or K=4) SOLAR PROTONS : Quiet PREDICTIONS FOR 15 Jul 2026 10CM FLUX: 099 / AP: 007 PREDICTIONS FOR 16 Jul 2026 10CM FLUX: 098 / AP: 008 PREDICTIONS FOR 17 Jul 2026 10CM FLUX: 099 / AP: 010 Solar Active Regions and flaring: Solar flaring activity has been low over the past 24 hours, with few C-class flares. The strongest flare was a C3.9 flare (SIDC Flare 8201) from beyond the west limb, peaking at 12:39 UTC on July 14. There are currently two numbered active regions on the solar disk. The most complex one is SIDC Sunspot Group 910 (NOAA Active Region 4482, magnetic type beta). SIDC Sunspot Group 912 (NOAA Active Region 4487) has decayed into plage. The solar flaring activity is expected to be low over the next 24 hours, with a chance for C-class flares. Coronal mass ejections: A Coronal Mass Ejection (SIDC CME 688) was observed in LASCO/C2 coronagraph imagery, lifting off from the southwest limb starting from 03:22 UTC on July 15. It is most likely associated with a prominence eruption over the southwest limb and it is not expected to impact Earth. No other Earth-directed CMEs were observed in the available coronagraph imagery during the last 24 hours. Coronal holes: A northern, positive polarity coronal hole (SIDC Coronal Hole 174) is crossing the central meridian. A mild high-speed stream may arrive at Earth starting from July 18. Solar wind: Over the past 24 hours, the solar wind parameters (SOLAR-1 and ACE) reflected the possible impact of a glancing blow (associated with SIDC CME 686), combined potentially with a high-speed stream from the southern, positive polarity coronal holes (SIDC Coronal Holes 172 and 173). The solar wind speed increased from 350 km/s to around 500 km/s. The interplanetary magnetic field reached a maximum of 14 nT. The Bz component reached a minimum of -8 nT. The interplanetary magnetic field angle phi was initially negative and has switched to positive since 18:00 UTC on July 14. Mostly enhanced solar wind conditions are expected over the next 24 hours, due to the ongoing influence of the high-speed stream. Geomagnetism: Geomagnetic conditions globally were initially quiet during the past 24 hours, increasing to active levels (NOAA Kp 4- ) between 03:00 UTC and 06:00 UTC on July 15. Geomagnetic conditions locally were initially quiet to unsettled (K Bel 2 to 3), increasing to active levels (K Bel 4) between 06:00 UTC and 08:00 UTC. Mostly quiet to unsettled conditions (NOAA Kp 2 to 3) are expected over the next 24 hours, with a chance for isolated active intervals, due to the ongoing influence of the high-speed stream. Proton flux levels: The greater than 10 MeV proton flux was below the 10 pfu threshold during the past 24 hours. It is expected to remain below the threshold level over the next 24 hours. Electron fluxes at GEO: The greater than 2 MeV electron flux measured by GOES 18 was above the 1000 pfu threshold between 17:20 UTC and 23:35 UTC on July 14. The greater than 2 MeV electron flux measured by GOES 19 was enhanced but remained below the 1000 pfu threshold during the past 24 hours. The greater than 2 MeV electron flux is expected to remain below the 1000 pfu threshold over the next 24 hours. The 24-hour electron fluence was at normal levels and it is expected to remain so over the next 24 hours. TODAY'S ESTIMATED ISN : 027, BASED ON 27 STATIONS. SOLAR INDICES FOR 14 Jul 2026 WOLF NUMBER CATANIA : 038 10CM SOLAR FLUX : 100 AK CHAMBON LA FORET : 016 AK WINGST : 011 ESTIMATED AP : 010 ESTIMATED ISN : 039, BASED ON 32 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 # #--------------------------------------------------------------------#