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 meu

Archive

Latest issue

:Issued: 2021 Jan 20 1230 UTC
:Product: documentation at http://www.sidc.be/products/meu
#--------------------------------------------------------------------#
# DAILY BULLETIN ON SOLAR AND GEOMAGNETIC ACTIVITY from the SIDC     #
# (RWC Belgium)                                                      #
#--------------------------------------------------------------------#
SIDC URSIGRAM 10120
SIDC SOLAR BULLETIN 20 Jan 2021, 1230UT
SIDC FORECAST (valid from 1230UT, 20 Jan 2021 until 22 Jan 2021)
SOLAR FLARES  : Quiet conditions (<50% probability of C-class flares)
GEOMAGNETISM  : Quiet (A<20 and K<4)
SOLAR PROTONS : Quiet
PREDICTIONS FOR 20 Jan 2021  10CM FLUX: 078 / AP: 006
PREDICTIONS FOR 21 Jan 2021  10CM FLUX: 076 / AP: 006
PREDICTIONS FOR 22 Jan 2021  10CM FLUX: 076 / AP: 006
COMMENT: During last 24 hours the solar flaring activity slightly
increased. Several B-class and an isolated C-class flares were reported,
all originating from the NOAA AR 2797. The impulsive C1.0 flare peaked at
17:54 UT on January 19. Presently available coronagraph observations (there
is a large data gap in observations) do not show signatures of the possibly
associated CME. We expect such a level of flaring activity to persist in
the coming hours.
During last 24 hours no Earth directed CMEs were observed in coronagraph
data, and proton flux levels remained at background values.

The solar wind speed is presently around 340 km/s and the interplanetary
magnetic field magnitude is about 6 nT. The geomagnetic conditions are
presently quiet and we expect quiet to unsettled geomagnetic conditions in
the coming hours.
TODAY'S ESTIMATED ISN  : 019, BASED ON 13 STATIONS.

SOLAR INDICES FOR 19 Jan 2021
WOLF NUMBER CATANIA    : 025
10CM SOLAR FLUX        : 078
AK CHAMBON LA FORET    : 007
AK WINGST              : ///
ESTIMATED AP           : 006
ESTIMATED ISN          : 017, BASED ON 16 STATIONS.

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

BT
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Details

The SIDC ursigram starts with the code SIDC URSIGRAM YMMDD, where
Y is the last digit of the year number,
MM is the number of the month,
DD is the day of the month.

A forecast is given 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.