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OK0NAG > SOLAR 27.11.17 13:56l 128 Lines 4392 Bytes #999 (0) @ EU
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Subj: GEOALERT SIDC
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Date: Mon, 27 Nov 2017 12:30:17 GMT
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Subject: GEOALERT SIDC
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:Issued: 2017 Nov 27 1230 UTC
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#--------------------------------------------------------------------#
# GEOALERT message from the SIDC (RWC-Belgium) #
#--------------------------------------------------------------------#
GEOALERT BRU331
UGEOA 30512 71127 1230/ 9930/
10272 21272 30272
99999
PLAIN
NOTE: the above forecasts are valid from 1230UT, 27 Nov 2017 until 29 Nov
2017
PREDICTIONS FOR 27 Nov 2017 10CM FLUX: 075 / AP: 011
PREDICTIONS FOR 28 Nov 2017 10CM FLUX: 074 / AP: 013
PREDICTIONS FOR 29 Nov 2017 10CM FLUX: 074 / AP: 008
COMMENT: Solar activity was at very low levels. NOAA 2689 is the only
visible sunspot group and was the source of a B2.9 event peaking at
11:17UT. Several filaments are present in the northern hemisphere, as well
as a long filament in the SW quadrant. No earth-directed coronal mass
ejections (CMEs) were observed in available coronagraphic imagery. The
greater than 10 MeV proton flux was at nominal levels.
Quiet flaring conditions are expected, with a small chance on a C-class
flare.
The direction of the interplanetary magnetic field switched from away to
towards the Sun around noon on 26 November. It was accompanied by a gradual
increase in solar wind density, likely from the stream interaction region
preceding the expected high speed stream (HSS) from the negative equatorial
coronal hole (CH). Solar wind speed was around 300 km/s until 19:00UT,
when
it started a gradual increase to its current values between mostly 400
and
430 km/s (DSCOVR). Bz varied between -6 and +10 nT.
The geomagnetic field was at quiet levels throughout the period. Increasing
wind speeds are expected in response to the full arrival of the HSS later
today, which may result in unsettled to active geomagnetic conditions.
A
glancing blow from the 25 November CME is possible and may result in
unsettled conditions late on 28 or on 29 November.
TODAY'S ESTIMATED ISN : 016, BASED ON 09 STATIONS.
99999
UGEOI 30512 71127 1230/ 26///
1//// 20760 3002/ 4//// 8//// 9////
99999
NOTICEABLE EVENTS SUMMARY
DAY BEGIN MAX END LOC XRAY OP 10CM Catania/NOAA RADIO_BURST_TYPES
NONE
END
UGEOR 30512 71127 1230/ ///// /////
99999
USSPS 31405 27096 01532 65005 42713 21305
USSPS 32404 25093 01532 84002 10113 21305
USSPS 21305 25162 01422 86002 40313 11304
USSPS 81202 26024 01532 81009 40912 21505
UMAGF 30503 71127 1004/ 26063 1/006 21001 31121
UMAGF 31523 71127 0000/ 26008 1/002 20010 31121
#--------------------------------------------------------------------#
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