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 | tot |
Latest issue
:Issued: 2026 Aug 13 1230 UTC :Product: documentation at http://www.sidc.be/products/tot #--------------------------------------------------------------------# # DAILY BULLETIN ON SOLAR AND GEOMAGNETIC ACTIVITY from the SIDC # #--------------------------------------------------------------------# SIDC URSIGRAM 60813 SIDC SOLAR BULLETIN 13 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 13 Aug 2026 10CM FLUX: 101 / AP: 006 PREDICTIONS FOR 14 Aug 2026 10CM FLUX: 105 / AP: 014 PREDICTIONS FOR 15 Aug 2026 10CM FLUX: 107 / AP: 015 Solar Active Regions and flaring: Solar flaring activity was very low over the past 24 hours as the X-ray flux was below C level. The newly-emerged SIDC Sunspot Group 942 (NOAA Active Region 4509, Beta magnetic configuration) is rapidly growing and is likely to produce C-class flaring activity 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 450 to 390 km/s, the interplanetary magnetic field (B) ranged between 2 and 6 nT, and its North- South component (Bz) varied from -5 to 4 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 1 to 3- and K BEL 1 to 3). As a HSS is expected in the next 24 hours, active conditions are likely to register in the next 24 hours. 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 : 091, BASED ON 19 STATIONS. 99999 SOLAR INDICES FOR 12 Aug 2026 WOLF NUMBER CATANIA : /// 10CM SOLAR FLUX : 100 AK CHAMBON LA FORET : 015 AK WINGST : 012 ESTIMATED AP : 011 ESTIMATED ISN : 075, BASED ON 30 STATIONS. NOTICEABLE EVENTS SUMMARY DAY BEGIN MAX END LOC XRAY OP 10CM Catania/NOAA RADIO_BURST_TYPES NONE END UMAGF 30503 60813 1004/ 12061 1/015 22221 33123 UMAGF 31523 60813 0000/ 12002 1/012 22322 33242 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.
Besides the ISES codes like UMAGF, UCOSE and USSPS,
this message contains a forecast 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.