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 uge

Latest issue

:Issued: 2017 Sep 23 1234 UTC
:Product: documentation at http://www.sidc.be/products/uge
#--------------------------------------------------------------------#
# DAILY BULLETIN ON SOLAR AND GEOMAGNETIC ACTIVITY from the SIDC     #
#--------------------------------------------------------------------#
SIDC URSIGRAM 70923
GEOALERT BRU266
UGEOA 30512 70923 1234/ 9930/ 
11232 21232 30232 
99999
PLAIN
NOTE: the above forecasts are valid from 1230UT, 23 Sep 2017 until 25 Sep
2017
COMMENT: Over the past 24 hours the solar activity was very low, only a
small B-class flare was recorded. Catania sunspot groups 56 (NOAA active
regions 2681) remained stable showing no flaring activity. Catania sunspot
group 55 (NOAA active region 2680) is currently turning over the west solar
limb. The top of the loops from the returning region Catania sunspot group
46 (NOAA active region 2673), from which a B3.0-class flare (Sept 23 at
06:03 UT) is attributed, is now visible at the east solar limb. We expect
the solar activity to increase due to this returning region with C-class
flares. As this region was very active with several X-class flares during
the previous solar rotation, we cannot exclude the possibility of M to
X-class flares to occur. Once the foot-points of the loops will be visible,
a better estimation of its magnetic complexity will be made and we will be
able to better estimate the probability of flaring activity.

No Earth directed CMEs have been observed and the solar protons remained at
background level over the past 24 hours.

The Earth remained inside a slow solar wind flow with de speed lower than
400 Km/s. The interplanetary magnetic field magnitude remained below 6 nT
and the Bz component fluctuated between -4 and 4 nT being mainly negative.
The associated fast solar wind to the small equatorial coronal hole that
has crossed the central meridian on Sept 20 is expected to arrive at Earth
today around midnight UT time.

Geomagnetic conditions were mostly quiet to unsettled with Kp (NOAA) and
local K (Dourbes) indexes ranging between 1-2 and 0-3 respectively. While
the solar wind remained in its nominal condition, the local K (Dourbs)
sowed an unexpected short duration maximum (K=4) at 22:00 UT due to the Bz
components being mostly negative. The geomagnetic conditions are expected
to remain quiet to unsettled until Sept 23 when the fast solar will reach
Earth.



TODAY'S ESTIMATED ISN  : 012, BASED ON 21 STATIONS.
UGEOI 30512 70923 1234/ 22/// 
10022 20780 3008/ 4//// 80102 90100 
99999
UGEOR 30512 70923 1234/ 22/06 23102 
10055 2//// 3//// 472// 50030 60001 48408 00000 
10056 2//// 3//// 472// 50070 60001 25513 00000 
99999
UMAGF 30503 70923 1004/ 22064 1/012 21111 33311
UMAGF 31523 70923 0000/ 22001 1/008 21111 31134
BT
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