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Inserito il - 10/04/2018 : 11:41:00
:Product: SWPC Space Weather Alerts ALTS.txt
:Issued: 2018 Apr 10 0933 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# See http://swpc.noaa.gov/alerts/ for description and other displays
# Send comments and suggestions to SWPC.Webmaster@noaa.gov
#
# SWPC Space Weather Alerts Issued in the last 24 hours
#---------------------------------------------------------------------
Space Weather Message Code: WARK05
Serial Number: 1466
Issue Time: 2018 Apr 10 0702 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2018 Apr 10 0702 UTC
Valid To: 2018 Apr 10 1200 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
#-------------------------------------------------
Space Weather Message Code: WARK04
Serial Number: 3456
Issue Time: 2018 Apr 10 0552 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3455
Valid From: 2018 Apr 09 2130 UTC
Now Valid Until: 2018 Apr 10 1500 UTC
Warning Condition: Persistence
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
#-------------------------------------------------
Space Weather Message Code: WARK05
Serial Number: 1465
Issue Time: 2018 Apr 09 2335 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2018 Apr 09 2335 UTC
Valid To: 2018 Apr 10 0600 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
#-------------------------------------------------
Space Weather Message Code: ALTK04
Serial Number: 2048
Issue Time: 2018 Apr 09 2152 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2018 Apr 09 2151 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
#-------------------------------------------------
Space Weather Message Code: WARK04
Serial Number: 3455
Issue Time: 2018 Apr 09 2131 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2018 Apr 09 2130 UTC
Valid To: 2018 Apr 10 0600 UTC
Warning Condition: Onset
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
#-------------------------------------------------
:Product: Solar and Geophysical Activity Summary
:Issued: 2018 Apr 10 0245 UTC
# Prepared jointly by the U.S. Dept. of Commerce, NOAA,
# Space Weather Prediction Center and the U.S. Air Force.
#
Joint USAF/NOAA Solar and Geophysical Activity Summary
SGAS Number 100 Issued at 0245Z on 10 Apr 2018
This report is compiled from data received at SWO on 09 Apr
A. Energetic Events
Begin Max End Rgn Loc Xray Op 245MHz 10cm Sweep
None
B. Proton Events: None
C. Geomagnetic Activity Summary: The geomagnetic field was quiet to
active.
D. Stratwarm: Not Available
E. Daily Indices: (real-time preliminary/estimated values)
10 cm 069 SSN 000 Afr/Ap 011/010 X-ray Background <A1.0
Daily Proton Fluence (flux accumulation over 24 hrs)
GT 1 MeV 1.1e+06 GT 10 MeV 1.6e+04 p/(cm2-ster-day)
(GOES-15 satellite synchronous orbit W135 degrees)
Daily Electron Fluence
GT 2 MeV 6.00e+06 e/(cm2-ster-day)
(GOES-15 satellite synchronous orbit W135 degrees)
3 Hour K-indices:
Boulder 2 2 3 2 3 3 2 4 Planetary 1 1 3 1 2 2 3 4
F. Comments: None
:Product: Weekly Highlights and Forecasts
:Issued: 2018 Apr 09 0536 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC contact on the Web
# http://www.swpc.noaa.gov/weekly.html
#
# Weekly Highlights and Forecasts
#
Highlights of Solar and Geomagnetic Activity
02 - 08 April 2018
Solar activity was at very low levels throughout the period with
only a few low level B-class flare observed on 03 Apr from Region
2703 (S08, L=193, class/area Axx/010 on 31 Mar). No Earth-directed
coronal mass ejections were observed.
No proton events were observed at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit reached
high levels on 02-04 Apr and at moderate levels on 05-08 Apr. The
largest flux of the period was 2,150 pfu observed at 02/1915 UTC.
Geomagnetic field activity was mostly quiet with unsettled periods
observed on 05 Apr. Solar wind speed began the period slightly
enhanced near 470 km/s with total field around 4-5 nT. Solar wind
speed declined to near 320 km/s by 04 April before increasing
briefly to near 450 km/s by late on 05 Apr. Total field increased to
a maximum of 9 nT at 05/2130 UTC. By 07 Apr, solar wind speed had
decreased to 330-380 km/s while the total field decreased to 5 nT or
less.
Forecast of Solar and Geomagnetic Activity
09 April - 05 May 2018
Solar activity is expected to be at very low levels throughout the
forecast period.
No proton events are expected at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit is
expected to reach high levels on 12-30 Apr due to recurrent coronal
hole high speed stream (CH HSS) influence.
Geomagnetic field activity is expected to be at unsettled to active
levels on 10-16 Apr and again from 19-23 Apr with G1 (minor) storm
levels likely on 10-11 Apr due to recurrent CH HSS effects.
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