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 Mar 15 1230 UTC :Product: documentation at http://www.sidc.be/products/tot #--------------------------------------------------------------------# # DAILY BULLETIN ON SOLAR AND GEOMAGNETIC ACTIVITY from the SIDC # #--------------------------------------------------------------------# SIDC URSIGRAM 60315 SIDC SOLAR BULLETIN 15 Mar 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 15 Mar 2026 10CM FLUX: 110 / AP: 019 PREDICTIONS FOR 16 Mar 2026 10CM FLUX: 115 / AP: 013 PREDICTIONS FOR 17 Mar 2026 10CM FLUX: 115 / AP: 011 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 M1.0 flare (SIDC Flare 7215) peaking on March 15 at 09:39 UTC, which was produced by SIDC Sunspot Group 820 (NOAA Active Region 4392). SIDC Sunspot Group 819 (NOAA Active Region 4393) was in charge of the majority of the C-class flaring over the past 24 hours. A total of 5 numbered sunspot groups were identified on the disk over the past 24 hours, all having simple (alpha or beta) magnetic configuration. Solar flaring activity is expected to be low over the next 24 hours, with C-class flares likely and a small chance for M-class flares. Coronal mass ejections: No new Earth-directed Coronal Mass Ejections (CMEs) have been detected in the available coronagraph images. Coronal holes: The southern midlatitude extension of the large positive polarity trans-equatorial coronal hole (SIDC Coronal Hole 154) is still crossing the central meridian. The associated high-speed stream is currently enhancing solar wind conditions at Earth. Solar wind: The solar wind conditions were enhanced over the past 24 hours, due to the influence of the high-speed streams associated with the SIDC coronal hole 154 (which first reached the central meridian in Mar 11). The interplanetary magnetic field reached 9 nT and is currently at 5 nT, with the Bz reaching a minimum value of -7 nT. The solar wind velocity reached 700 km/s and are currently around 650km/s. Enhanced solar wind conditions are expected in the next 24 hours. Geomagnetism: The geomagnetic conditions were globally mainly active and reached minor storm levels (NOAA Kp 5) between 12:00 and 15:00 UTC on Mar 14 (Locally unsettled to active conditions (K BEL 4)), due to the high speed stream arrival of the SIDC CH 154. Unsettled to active conditions are expected for the next 24 hours. Proton flux levels: The greater than 10 MeV proton flux, as measured by the GOES-19 satellite, was at background 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 remained below the 1000 pfu alert threshold, and is expected to remain below the threshold during the next 24 hours. The 24h electron fluence was at normal levels and is expected to remain so. TODAY'S ESTIMATED ISN : 071, BASED ON 16 STATIONS. 99999 SOLAR INDICES FOR 14 Mar 2026 WOLF NUMBER CATANIA : /// 10CM SOLAR FLUX : 112 AK CHAMBON LA FORET : 037 AK WINGST : 036 ESTIMATED AP : 037 ESTIMATED ISN : 063, BASED ON 20 STATIONS. NOTICEABLE EVENTS SUMMARY DAY BEGIN MAX END LOC XRAY OP 10CM Catania/NOAA RADIO_BURST_TYPES 15 0921 0939 0952 ////// M1.0 /////// III/2 END UMAGF 30503 60315 1004/ 14064 1/037 24343 33442 UMAGF 31523 60315 0000/ 14000 1/036 26544 35334 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.