GEOALERT SIDC

3-day-forecast of solar and geomagnetic activity.
Source SIDC (RWC-Belgium)
Frequency Daily
Format Encoded data (ISES)
Mail header GEOALERT SIDC
SIDC code xut

Latest issue

:Issued: 2024 Mar 28 1233 UTC
:Product: documentation at http://www.sidc.be/products/xut
#--------------------------------------------------------------------#
# GEOALERT message from the SIDC (RWC-Belgium)                       #
#--------------------------------------------------------------------#
GEOALERT BRU088
UGEOA 30512 40328 1233/ 9930/ 
12282 20282 30282 
99999
PLAIN
PREDICTIONS FOR 28 Mar 2024  10CM FLUX: 170 / AP: 006
PREDICTIONS FOR 29 Mar 2024  10CM FLUX: 166 / AP: 005
PREDICTIONS FOR 30 Mar 2024  10CM FLUX: 155 / AP: 008

Solar Active Regions and flaring: The solar flaring activity was moderate
with one M-class flare recorded. The largest flare of the period was an
M7.1 flare with peak time 06:29 UTC March 28. This flare originated from
Catania region 22 (NOAA AR 3615), which is the largest and most complex
region on disk (Beta-Gamma-Delta) but has begun to decay slightly. This
region also produced much of the C-class flaring activity. Catania region
30 and 32 (NOAA ARs 3623 and 3622) decayed into plage regions The remaining
regions on disk are simple and were either stable or in decay. The solar
flaring activity is expected to be at moderate levels over the next 24
hours with C-class flares expected, M-class flares likely and a low
probability for an X-class flare.

Coronal mass ejections: No Earth directed Coronal Mass Ejections (CMEs)
have been detected in the available coronagraph imagery.

Coronal holes: Two small positive polarity coronal holes one near the
equator and one in the southern hemisphere began to cross the central
meridian on March 27.

Solar wind: The solar wind speed gradually decreased from values around 500
km/s to around 420 km/s due to the waning influence of the ICME which
arrived on March 24. The interplanetary magnetic field ranged between 0 and
5 nT. The Bz component reached a minimum value of -2 nT.  The
interplanetary magnetic field phi angle was predominantly in the positive
sector. The solar wind speed is expected to reflect slow solar wind
conditions on March 28 and 29, enhancements due to the solar wind
associated with the positive coronal holes may be expected from March 30.

Geomagnetism: Geomagnetic conditions were at quiet levels (NOAA Kp 2 and
Local K Bel 2). Geomagnetic conditions are expected to be at quiet to
unsettled levels on March 28 to March 30.

Proton flux levels: Over the past 24 hours the greater than 10 MeV GOES
proton flux was still slightly enhanced but remained below the 10pfu
threshold. The proton flux is expected to continue to decrease and remain
below 10 Mev threshold over the next 24 hours.

Electron fluxes at GEO: The greater than 2 MeV electron flux remained below
the 1000 pfu threshold as measured by GOES 16. It is expected to exceed
this threshold over the next days. The 24-hour electron fluence was at
nominal levels. The electron fluence is expected to increase to normal to
moderate levels over the next day.


TODAY'S ESTIMATED ISN  : 097, BASED ON 14 STATIONS.
99999
UGEOI 30512 40328 1233/ 27/// 
1//// 21750 3006/ 4//// 8//// 9//// 
99999

NOTICEABLE EVENTS SUMMARY
DAY BEGIN MAX  END  LOC    XRAY OP  10CM Catania/NOAA RADIO_BURST_TYPES 
28  0616  0629 0636 S16W55 M7.1 1N       22/3615      
END

UGEOR 30512 40328 1233/ ///// ///// 
99999
USSPS 81202 27021 13032 83009 44716 2/801 89014 40818 21410 94001 10521
01202 93001 13311 01202 90002 22009 11303 86003 30914 2/801 84096 34213
57641
UMAGF 30503 40328 1004/ 27068 1/008 22111 31121
UMAGF 31523 40328 0000/ 27008 1/006 23122 31111
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Details

The Geoalert message starts with the code GEOALERT BRUXXX, where xxx is the day-of-the-year number.
Besides the ISES codes like UGEOA, UGEOI, UGEOR and USSPS, this message contains the following information:
PLAIN
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
99999
This gives the predicted 10.7 cm radioflux and the predicted Ap index for 3 days starting on the date of the message
NOTICEABLE EVENTS SUMMARY
DAY BEGIN MAX END LOC XRAY OP 10CM TYPE Catania NOAA NOTE

This is the header of a table that lists all major events.
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.