Viewing archive of lördag, 17 september 2011

Solaktivitetsrapport

Any mentioned solar flare in this report has a scaling factor applied by the Space Weather Prediction Center (SWPC). Because of the SWPC scaling factor, solar flares are reported as 42% smaller than for the science quality data. The scaling factor has been removed from our archived solar flare data to reflect the true physical units.
Rapport för sol- och geofysisk aktivitet 2011 Sep 17 2200 UTC
Skapad av NOAA © SWPC och bearbetad av SpaceWeatherLive.com

USAF/NOAA rapport för sol- och geofysisk aktivitet

SDF Nummer 260 publicerat klockan 2200Z på 17 Sep 2011

IA. Analys av solfläcksgrupper och solaktivitet från 16-2100Z till 17-2100Z

Solar activity was low during the past 24 hours. Regions 1289 (N22W67) and 1290 (S13W84) each produced C-class events, the largest a long duration C2 event from Region 1289 at 16/2351Z. An associated CME first became visible on LASCO C2 imagery at 16/2348Z and had an estimated plane-of-sky speed of 575 km/s. Further analysis will be conducted to determine geoeffectiveness.
IB. Prognos för solaktivitet
Solar activity is expected to be low with a chance for isolated M-class flares for the next three days (18-20 September).
IIA. Sammanfattning av geofysisk aktivitet 16-2100Z till 17-2100Z
The geomagnetic field was quiet until approximately 17/0400Z when effects from the 14 September CME arrived at Earth. A shock was observed at ACE at 17/0256Z which was followed by a sudden impulse of 21 nT observed by the Boulder magnetometer. Solar wind speeds increased from approximately 350 km/s to 450 km/s along with a noticeable increase in temperature and density. The interplanetary magnetic field Bt reached +14 nT and there were several extended periods of southward Bz with a maximum deviation of -12 nT. Conditions at Earth increased to active levels following shock arrival with an isolated minor storm period at 17/1800Z. Solar wind speeds peaked at 550 km/s around 17/1115Z but have since decreased to approximately 450 km/s. The greater than 2 MeV electron flux at geosynchronous orbit reached high levels during the period.
IIB. Prognos för geofysisk aktivitet
The geomagnetic field is expected to be quiet to unsettled with a slight chance for isolated active periods on day one (18 September) as effects from the 14 September CME subside. Mostly quiet conditions are expected for days two and three (19-20 September).
III. Chans för solutbrott från 18 Sep till 20 Sep
M-klass30%35%35%
X-klass01%01%01%
Proton01%01%01%
PCAFgreen
IV. Penticton 10.7 cm Flux
  Observerad       17 Sep 145
  Prognoserat   18 Sep-20 Sep  145/145/145
  90 Day Mean        17 Sep 102
V. Geomagnetiskt A-index
  Observerad Afr/Ap 16 Sep  002/002
  Förväntat     Afr/Ap 17 Sep  023/032
  Prognoserat    Afr/Ap 18 Sep-20 Sep  010/010-005/005-005/005
VI. Chanser för geomagnetisk aktivitet från 18 Sep till 20 Sep
A. Medelhöga breddgrader
Aktivt20%10%05%
Små stormförhållanden10%01%01%
Svåra stormförhållanden01%01%01%
B. Höga breddgrader
Aktivt25%15%05%
Små stormförhållanden15%05%01%
Svåra stormförhållanden01%01%01%

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