SIDC Ursigram
3-day-forecast of solar and geomagnetic activity.| Source | SIDC (RWC-Belgium) |
| Frequency | Daily |
| Format | Encoded data (ISES) |
| Mail header | SIDC Ursigram |
| SIDC code | meu |
Archive
Latest issue
:Issued: 2026 Aug 14 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 60814 SIDC SOLAR BULLETIN 14 Aug 2026, 1230UT SIDC FORECAST SOLAR FLARES : C-class flares expected, (probability >=50%) GEOMAGNETISM : Active conditions expected (A>=20 or K=4) SOLAR PROTONS : Quiet PREDICTIONS FOR 14 Aug 2026 10CM FLUX: 107 / AP: 008 PREDICTIONS FOR 15 Aug 2026 10CM FLUX: 109 / AP: 015 PREDICTIONS FOR 16 Aug 2026 10CM FLUX: 111 / AP: 010 Solar Active Regions and flaring: Solar flaring activity was low over the past 24 hours, with three C-class flares identified. SIDC Sunspot Group (SG) 936 (NOAA Active Region [AR] 4503, Beta magnetic configuration) had a sudden flux emerge shortly before the release of SIDC flare 8350 on 14 Aug at 07:01 UTC. With a C4 brightness this is the larger flare since 2 Aug. SIDC SG 941 (NOAA AR 4508, Alpha magnetic configuration) produced the second C-class flare and SIDC SG 939 (NOAA AR 4506, Beta magnetic configuration) the third. Isolated C-class flaring activity is expected in the next 24 hours. Coronal mass ejections: No Earth-directed Coronal Mass Ejections (CME) were observed in the last 24 hours. Solar wind: The Solar Wind (SW) conditions of the past 24 hours featured a slow SW regime. The SW speed dropped from 400 to 330 km/s, the interplanetary magnetic field (B) ranged between 3 and 8 nT, and its North- South component (Bz) varied from -6 to 6 nT. A High Speed Stream (HSS) that is associated with the SIDC Coronal Hole (CH) 174, is expected to arrive in the next 24 hours. Geomagnetism: The geomagnetic conditions of the past 24 hours were from quiet to unsettled both globally and locally (NOAA Kp and K BEL 1 to 3). As a HSS is likely to arrive in the next 24 hours, up to active conditions will probably register. Proton flux levels: The greater than 10 MeV proton flux, as measured by the GOES-19 satellite, was at nominal levels over the past 24 hours and is likely to remain so in the next 24 hours. Electron fluxes at GEO: The greater than 2 MeV electron flux, as measured by GOES 19, was below the 1000 pfu alert threshold for past 24 hours. It is expected to remain at the same levels in the next 24 hours. The electron fluence was at normal levels in the past 24 hours and it is expected to remain at the same levels in the next 24 hours. TODAY'S ESTIMATED ISN : 106, BASED ON 20 STATIONS. SOLAR INDICES FOR 13 Aug 2026 WOLF NUMBER CATANIA : /// 10CM SOLAR FLUX : 108 AK CHAMBON LA FORET : 014 AK WINGST : 011 ESTIMATED AP : 010 ESTIMATED ISN : 091, BASED ON 28 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 # #--------------------------------------------------------------------#
Details
The SIDC ursigram starts with the code SIDC URSIGRAM YMMDD, whereY is the last digit of the year number,
MM is the number of the month,
DD is the day of the month.
A forecast is given on:
the global flare probability,
geomagnetic disturbances,
solar proton events.
PREDICTIONS FOR "today" : 10CM FLUX: xxx / AP: xxx
PREDICTIONS FOR "today+1": 10CM FLUX: xxx / AP: xxx
PREDICTIONS FOR "today+2": 10CM FLUX: xxx / AP: xxx
COMMENT
ESTIMATED ISN : xxx, based on xx stations.
where ISN stands for International Sunspot Number.
OBSERVED SOLAR INDICES FOR THE DAY BEFORE
SUNSPOT INDEX : xxx, the Wolf number observed by Catania
10CM SOLAR FLUX : xxx,
AK CHAMBON LA FORET : xxx,
AK WINGST : xxx,
ESTIMATED AP : xxx,
ESTIMATED ISN : xxx, based on xx stations.
NOTICEABLE EVENTS SUMMARY
DAY BEGIN MAX END LOC XRAY OP 10CM TYPE Catania NOAA NOTE
DAY gives the day-of-the-month.
BEGIN, MAX and END give the UT time of the different phases of the X-ray output of the event.
LOC gives the location of the event in heliographic coordinates.
XRAY gives the GOES X-ray class of the event.
OP lists the optical flare class.
10cm gives the 10.7 cm radioflux output of the event.
TYPE specifies the type of radiobursts observed.
Catania gives the Catania sunspot group number where the event happened.
NOAA is the corresponding NOAA active region number.
NOTE is the header of any other type of information, e.g. if a CME was observed associated with the event.
Check the ISES code book for information on ISES codes.