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

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Latest issue

:Issued: 2016 May 24 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 60524
SIDC SOLAR BULLETIN 24 May 2016, 1230UT
SIDC FORECAST (valid from 1230UT, 24 May 2016 until 26 May 2016)
SOLAR FLARES  : Quiet conditions (<50% probability of C-class flares)
GEOMAGNETISM  : Active conditions expected (A>=20 or K=4)
SOLAR PROTONS : Quiet
PREDICTIONS FOR 24 May 2016  10CM FLUX: 094 / AP: 003
PREDICTIONS FOR 25 May 2016  10CM FLUX: 093 / AP: 007
PREDICTIONS FOR 26 May 2016  10CM FLUX: 092 / AP: 011
COMMENT: Eight B-class flares and one C-class event were observed during
the period, with the C1.3 flare peaking at 10:20UT on 24 May. The source of
all this minor flaring activity was NOAA 2546 which remains the largest
sunspot group currently visible. A new small sunspot region emerged near
disk centre (Catania 80; N12E01), but remained quiet. No earth-directed
coronal mass ejections (CMEs) were observed.

Mostly quiet conditions are expected, with a small chance on an isolated
C-class flare.

Solar wind speed mostly varied between 400 and 500 km/s. Bz varied between
-6 and +6 nT, with the Interplanetary Magnetic Field directed away from the
Sun. A small negative coronal hole (CH) on the southern hemisphere has
transited the central meridian. Quiet geomagnetic conditions were observed.

Quiet to unsettled geomagnetic conditions are expected during the first 24
hours. Late on 25 or on 26 May, the wind stream associated with the small
negative southern CH may affect the geomagnetic environment. This may
result in active geomagnetic conditions.

TODAY'S ESTIMATED ISN  : 024, BASED ON 20 STATIONS.

SOLAR INDICES FOR 23 May 2016
WOLF NUMBER CATANIA    : 021
10CM SOLAR FLUX        : 097
AK CHAMBON LA FORET    : 008
AK WINGST              : 004
ESTIMATED AP           : 004
ESTIMATED ISN          : 016, BASED ON 23 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.