SIDC ursigram

:Issued: 2018 Sep 22 1230 UTC
:Product: documentation at http://www.sidc.be/products/uge
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# DAILY BULLETIN ON SOLAR AND GEOMAGNETIC ACTIVITY from the SIDC     #
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SIDC URSIGRAM 80922
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
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.
UGEOI 30512 80922 1230/ 21/// 
10000 20670 3009/ 4//// 80000 90000 
99999
UGEOR 30512 80922 1230/ ///// ///// 
99999
UMAGF 30503 80922 1004/ 21066 1/028 20111 32544
UMAGF 31523 80922 0000/ 21002 1/009 20111 31225
BT
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