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: 2018 Apr 20 1230 UTC
:Product: documentation at http://www.sidc.be/products/xut
#--------------------------------------------------------------------#
# GEOALERT message from the SIDC (RWC-Belgium)                       #
#--------------------------------------------------------------------#
GEOALERT BRU110
UGEOA 30512 80420 1230/ 9930/ 
10202 22202 30202 
99999
PLAIN
NOTE: the above forecasts are valid from 1230UT, 20 Apr 2018 until 22 Apr
2018
PREDICTIONS FOR 20 Apr 2018  10CM FLUX: 073 / AP: 035
PREDICTIONS FOR 21 Apr 2018  10CM FLUX: 072 / AP: 013
PREDICTIONS FOR 22 Apr 2018  10CM FLUX: 072 / AP: 009
COMMENT: The sunspot group which appeared from the behind of the East solar
limb yesterday got numbered as Catania sunspot group 78 (NOAA AR 2706).
This sunspot group was source of the all (low B-class), flaring activity
during last 24 hours. We expect that Catania sunspot group 78 might be the
source of the B-class flares and possibly also isolated C-class flare in
the following 24 hours.
There were no Earth directed CMEs observed since the last report and the
solar protons remain at the background level.

The in situ observations showed sudden increase of the interplanetary
magnetic field magnitude (IMF), solar wind speed, density and temperature
at about 23:19 UT yesterday evening. All this indicates arrival of the
shock wave, however presently it is still unclear if the shock wave will be
followed by the ICME or this is a shock in the solar wind related with the
expected arrival of the fast flow.
The shock wave was followed by gradual increase of the solar wind speed and
IMF. The fast solar wind (up to 515 km/s) and longer intervals of negative
values of the Bz component of the IMF (down to -19 nT), resulted in the
active to storm geomagnetic conditions reported this morning (local station
at Dourbes reported K=5 and NOAA reported Kp=6).
The solar wind speed is presently about 480 km/s and the IMF is about 14
nT. If the solar wind speed will continue to increase and the Bz component
will show longer intervals with negative values we can expect continuation
of the disturbed geomagnetic conditions in the coming hours.

TODAY'S ESTIMATED ISN  : 015, BASED ON 27 STATIONS.
99999
UGEOI 30512 80420 1230/ 19/// 
10012 20710 3002/ 4//// 80101 90010 
99999

NOTICEABLE EVENTS SUMMARY
DAY BEGIN MAX  END  LOC    XRAY OP  10CM Catania/NOAA RADIO_BURST_TYPES 
NONE
END

UGEOR 30512 80420 1230/ 20/06 20101 
10078 2//// 3//// 4321/ 50020 60005 16705 00000 
99999
USSPS 31405 20066 01542 78002 16705 21305
USSPS 21305 18157 02222 15001 20515 0/101 16001 41404 0/101
USSPS 81202 19038 01142 15001 30208 0/101
UMAGF 30503 80420 1004/ 19061 1/011 20110 31133
UMAGF 31523 80420 0000/ 19008 1/002 20002 31021
#--------------------------------------------------------------------#
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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.