Viewing archive of Saturday, 11 February 2012

Solar activity report

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.
Report of Solar-Geophysical Activity 2012 Feb 11 2200 UTC
Prepared by the NOAA © SWPC and processed by

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 042 Issued at 2200Z on 11 Feb 2012

IA. Analysis of Solar Active Regions and Activity from 10-2100Z to 11-2100Z

Solar activity was low due to a trio of C7 x-ray events. Regions 1416 (S19W02) and 1417 (N16E44) each produced C7 events at 10/2352Z and 11/1854Z respectively. The third C7 event was observed at 11/1004Z from behind the east limb near N25. The activity behind the NE limb portends the return of old Region 1402 (N26, L=218). Region 1416 continued its growth phase, both in area and spot count, and maintained a beta-gamma magnetic configuration. At about 10/1900Z, a 27 degree long segmented filament erupted in the NE quadrant of the disk. The ENE to WSW oriented filament was centered at N29E14. An associated CME was observed lifting of the NE limb, first visible in SOHO LASCO C2 imagery at 10/2012Z.
IB. Solar Activity Forecast
Solar activity is expected to be low with a chance for M-class activity for the next three days (12 - 14 February).
IIA. Geophysical Activity Summary 10-2100Z to 11-2100Z
The geomagnetic field was at quiet to unsettled levels. ACE solar wind speeds decreased steadily through the period from 450 km/s to about 350 km/s. The Bz component of the interplanetary magnetic field did not vary much beyond +/- 3 nT.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet to unsettled levels on days one and two (12 - 13 February) due to coronal hole high speed stream effects. Late on day two and through day three (14 February), field activity is expected to increase to unsettled to active levels, with high latitude minor storm intervals. This increase in activity is due to anticipated effects from the 10 February CME.
III. Event Probabilities 12 Feb to 14 Feb
Class M30%50%50%
Class X01%01%01%
IV. Penticton 10.7 cm Flux
  Observed       11 Feb 112
  Predicted   12 Feb-14 Feb  120/120/125
  90 Day Mean        11 Feb 135
V. Geomagnetic A Indices
  Observed Afr/Ap 10 Feb  004/004
  Estimated     Afr/Ap 11 Feb  004/005
  Predicted    Afr/Ap 12 Feb-14 Feb  006/008-011/012-014/018
VI. Geomagnetic Activity Probabilities 12 Feb to 14 Feb
A. Middle Latitudes
Minor storm05%15%20%
Major-severe storm01%01%05%
B. High Latitudes
Minor storm15%20%30%
Major-severe storm01%05%10%

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