Viewing archive of Wednesday, 7 March 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 Mar 07 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 067 Issued at 2200Z on 07 Mar 2012

IA. Analysis of Solar Active Regions and Activity from 06-2100Z to 07-2100Z

Solar activity was high. Region 1429 (N17E15) produced an X5/3B long-duration flare with maximum at 07/0024Z. The event was associated with type II and type IV radio sweeps and a full halo, though slightly asymmetric coronal mass ejection (CME). The CME had an estimated plane of sky speed of about 2200 km/s. During the decay of the X5 x-ray event, Region 1430 (N21W00) produced an X1/Sf at 0114Z. Region 1429 dominates the disk with an area of about 1300 millionths. Observations show slight separation of the central spots but the region continues to be large and magnetically complex; multiple deltas are clearly evident as well as a dominant east-west polarity inversion line. Region 1430 showed steady growth during the past 24 hours. Region 1428 (S17W05) also showed growth during the period but was relatively quiet and stable.
IB. Solar Activity Forecast
Solar activity is expected to be moderate to high. M-class level activity is expected to continue and there continues to be a good chance for an additional major flare and/or proton producing event from Region 1429. In addition, the growth trend in 1430 suggests that it may also contribute to the M-flare activity during the next three days.
IIA. Geophysical Activity Summary 06-2100Z to 07-2100Z
The geomagnetic field ranged from quiet to major storm levels during the past 24 hours. Activity levels were initially quiet to unsettled until an interplanetary shock arrived. The shock was seen at ACE at 07/0334Z and was followed by a sudden storm commencement (SSC) at Earth at 07/0421Z. Although solar wind speeds did not increase greatly, the interplanetary magnetic field (IMF) and density did increase markedly and the Bz component had numerous intervals of fairly strong southward orientation (with the strongest negative intervals at about -15 to -20 nT). Geomagnetic activity increased to minor to major storm levels following the SSC with some periods of severe storm levels at high latitudes. The disturbance most likely originated from the X1/halo CME that occurred on 05 March. A greater than 10 MeV proton event began at 07/0500Z and has reached a peak so far of 1630 PFU at 1540Z. A greater than 100 MeV proton event also occurred, beginning at 07/0405Z and reaching an apparent maximum of 69 PFU at 07/1525Z. Both of these events continue in progress and are clearly associated with todays X5/Full halo CME event.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be active initially on day 1 (08 March) but is expected to increase to major storm levels with a likelihood for isolated severe storm levels after the arrival of the CME from todays X5/full halo event. The arrival time is estimated to be sometime between 0600-1000Z. Minor to major storm levels are expected to continue partway (6-12 hours) into the second day (09 March), but a decline to predominantly active levels is expected for the remainder of the day. Predominantly unsettled levels are expected for the third day (10 March). The greater than 10 MeV proton event is expected to continue through the first day and is also likely to continue partway through the second day. The greater than 100 Mev proton event is expected to slowly decline over the next 24 hours.
III. Event Probabilities 08 Mar to 10 Mar
Class M85%85%85%
Class X40%40%40%
Proton99%80%50%
PCAFred
IV. Penticton 10.7 cm Flux
  Observed       07 Mar 136
  Predicted   08 Mar-10 Mar  140/140/135
  90 Day Mean        07 Mar 125
V. Geomagnetic A Indices
  Observed Afr/Ap 06 Mar  010/009
  Estimated     Afr/Ap 07 Mar  036/050
  Predicted    Afr/Ap 08 Mar-10 Mar  047/075-018/028-007/015
VI. Geomagnetic Activity Probabilities 08 Mar to 10 Mar
A. Middle Latitudes
Active15%20%25%
Minor storm40%40%15%
Major-severe storm45%30%05%
B. High Latitudes
Active05%25%15%
Minor storm10%35%30%
Major-severe storm85%25%45%

All times in UTC

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