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 Sep 22 1230 UTC
:Product: documentation at http://www.sidc.be/products/xut
#--------------------------------------------------------------------#
# GEOALERT message from the SIDC (RWC-Belgium)                       #
#--------------------------------------------------------------------#
GEOALERT BRU265
UGEOA 30512 80922 1230/ 9930/ 
10222 21222 30222 
99999
PLAIN
NOTE: the above forecasts are valid from 1230UT, 22 Sep 2018 until 24 Sep
2018
PREDICTIONS FOR 22 Sep 2018  10CM FLUX: 067 / AP: 018
PREDICTIONS FOR 23 Sep 2018  10CM FLUX: 067 / AP: 011
PREDICTIONS FOR 24 Sep 2018  10CM FLUX: 066 / AP: 008
COMMENT: There are presently no sunspot groups observed on the visible side
of the Sun. Accordingly, no flares were reported during last 24 hours and
we expect such a quiet conditions to persist in the coming hours.
No Earth directed CMEs were observed, and the solar protons remained at the
background level.

The in situ observations indicate arrival of the fast solar wind associated
with the low latitudinal extent of the northern polar coronal hole. The
interplanetary magnetic field magnitude started to increased simultaneously
with the density increase and the change of the phi angle in the late
evening of the September 21. After about 23:00 UT on September 21, density
decreased and solar wind speed started to increase simultaneously with the
increase of the temperature.
The solar wind speed is presently about 470 km/s and the interplanetary
magnetic field magnitude is about 10 nT.
The arrival of one more fast flow, associated with patchy equatorial
coronal hole which reached central meridian on September 18, is expected
this evening.
The arrival of the fast solar wind induced disturbed geomagnetic conditions
yesterday evening and this morning. Local station at Dourbes reported
intervals of K=4 at about 03:00 UT this morning, while NOAA reported two
intervals of  Kp=5 starting from about 21:00 UT yesterday up to 03:00 UT
this morning. Presently geomagnetic conditions are unsettled to active and
we expect such a disturbed geomagnetic conditions to remain the coming
hours. We might expect also isolated intervals of minor storm conditions
starting from late this evening due to arrival of the fast flow associated
with the equatorial coronal hole.

TODAY'S ESTIMATED ISN  : 000, BASED ON 20 STATIONS.
99999
UGEOI 30512 80922 1230/ 21/// 
10000 20670 3009/ 4//// 80000 90000 
99999

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

UGEOR 30512 80922 1230/ ///// ///// 
99999
UMAGF 30503 80922 1004/ 21066 1/028 20111 32544
UMAGF 31523 80922 0000/ 21002 1/009 20111 31225
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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.