Viewing archive of Saturday, 5 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 05 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 126 Issued at 2200Z on 05 May 2012

IA. Analysis of Solar Active Regions and Activity from 04-2100Z to 05-2100Z

Solar activity was at moderate levels. New Region 1476 (N09E67) produced several C-class flares along with an M1/Sn at 05/1329Z. The regions proximity to the limb makes spot classification difficult, however, it is currently considered a Dko-beta type group. Region 1469 (S26W77) continues to produce low level C-class activity as it rotates around the west limb. A model run was completed after the forecast was issued yesterday to include the CME observed off the southwest limb yesterday. It was determined that the CME has a slight Earth-directed component. A second CME, first visible in STEREO A COR2 imagery at 05/0309Z, appeared to be associated with a C1 flare from Region 1469 observed at 04/2350Z. Although both CMEs have a weak Earth-directed component, neither are expected to cause significant geomagnetic activity. A third CME associated with a C2/Sf flare from Region 1470 (S15W31) observed at 05/0639Z, first became visible in SDO AIA imagery at approximately 05/0600Z. Due to the source location, it is probable that the CME is Earth-directed and a model run is currently in progress to determine geoeffectiveness.
IB. Solar Activity Forecast
Solar activity is expected to be low with a chance for M-class flares for the next three days (06-08 May).
IIA. Geophysical Activity Summary 04-2100Z to 05-2100Z
The geomagnetic field was quiet during the past 24 hours.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be quiet on day one (06 May). Quiet to unsettled conditions are possible on days two and three (07-08 May) due to weak effects from the CMEs observed on 04 May.
III. Event Probabilities 06 May to 08 May
Class M25%25%25%
Class X01%01%01%
Proton01%01%01%
PCAFgreen
IV. Penticton 10.7 cm Flux
  Observed       05 May 116
  Predicted   06 May-08 May  115/115/115
  90 Day Mean        05 May 112
V. Geomagnetic A Indices
  Observed Afr/Ap 04 May  004/004
  Estimated     Afr/Ap 05 May  004/004
  Predicted    Afr/Ap 06 May-08 May  006/005-007/007-007/007
VI. Geomagnetic Activity Probabilities 06 May to 08 May
A. Middle Latitudes
Active05%10%10%
Minor storm01%01%01%
Major-severe storm01%01%01%
B. High Latitudes
Active10%15%15%
Minor storm01%05%05%
Major-severe storm01%01%01%

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