Viewing archive of Wednesday, 2 May 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 May 02 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 123 Issued at 2200Z on 02 May 2012

IA. Analysis of Solar Active Regions and Activity from 01-2100Z to 02-2100Z

Solar activity has been at low levels for the past 24 hours. Old Region 1468 (N11W96) produced two low level C-class events before rotating off the west limb. Region 1469 (S23W39) showed some rapid growth in the trailer spot region and is now magnetically classified as a beta-gamma. As Region 1469 was growing, it also produced two C-class x-ray events. Early in the period, a full-halo CME was observed in LASCO C2 imagery, but analysis indicated this was a backsided event. Around 02/1007Z, in SDO imagery, a large filament was observed lifting off the northwest limb of the solar disk. LASCO C2 imagery showed a CME around 02/1336Z that is believed to be associated with the filament eruption. Further analysis is needed to determine if this CME will become geoeffective. A new region was numbered today, Region 1474 (N14E71), as it rotated onto the northeast limb.
IB. Solar Activity Forecast
Solar activity is expected to be at low levels with a slight chance for M-class flares for the next three days (03 - 05 May) as Regions 1469 and 1471 (S21E19) continue to evolve.
IIA. Geophysical Activity Summary 01-2100Z to 02-2100Z
The geomagnetic field has been at quiet levels for the past 24 hours. The greater than 2 MeV electron flux at geosynchronous orbit was at high levels throughout the period.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet levels for the next three days (03 - 05 May).
III. Event Probabilities 03 May to 05 May
Class M15%15%15%
Class X01%01%01%
Proton01%01%01%
PCAFgreen
IV. Penticton 10.7 cm Flux
  Observed       02 May 116
  Predicted   03 May-05 May  115/115/115
  90 Day Mean        02 May 112
V. Geomagnetic A Indices
  Observed Afr/Ap 01 May  003/004
  Estimated     Afr/Ap 02 May  003/004
  Predicted    Afr/Ap 03 May-05 May  006/005-006/005-006/005
VI. Geomagnetic Activity Probabilities 03 May to 05 May
A. Middle Latitudes
Active05%05%05%
Minor storm01%01%01%
Major-severe storm01%01%01%
B. High Latitudes
Active15%15%15%
Minor storm10%10%10%
Major-severe storm05%05%05%

All times in UTC

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