Viewing archive of Wednesday, 4 July 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 Jul 04 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 186 Issued at 2200Z on 04 Jul 2012

IA. Analysis of Solar Active Regions and Activity from 03-2100Z to 04-2100Z

Solar activity increased to high levels. Region 1515 (S17W23) produced an M5/2b flare at 04/0955Z along with occasional low-level M-class flares including an M2/Sn at 04/0437Z associated with a 150 sfu Tenflare. Spot and penumbral development was evident in the leading half of the region and it retained its beta-gamma-delta magnetic configuration. Coronal mass ejections (CME) were associated with the flare activity in Region 1515, but the bulk of the ejecta was directed southward, out of the ecliptic plane. Region 1513 (N17W36) produced an M1/2n flare at 04/1639Z associated with Types II (estimated shock velocity 807 km/s) and IV radio sweeps and a 200 sfu Tenflare. This event was also associated with a CME that may have had an Earthward component, but further analysis will be required to determine potential geoeffectiveness. Region 1513 showed no significant changes and retained its beta-gamma magnetic configuration. New Regions 1518 (N09E65) and 1519 (S14E76) rotated into view and were numbered late in the period.
IB. Solar Activity Forecast
Solar activity is expected to be moderate through the period (05 - 07 July) with a chance for an isolated X-class flare from Region 1515.
IIA. Geophysical Activity Summary 03-2100Z to 04-2100Z
Geomagnetic field activity was at quiet to unsettled levels with active periods detected at high latitudes. ACE solar wind data indicated Earth remained within a recurrent coronal hole high-speed stream (CH HSS). Solar wind speeds were in the 463 to 601 km/s range and IMF Bz was variable in the +6 to -5 nT range. Todays observed Penticton 10.7 cm flux reading (163 sfu) was flare-enhanced. The greater than 2 MeV electron flux at geosynchronous orbit reached high levels during the period.
IIB. Geophysical Activity Forecast
Geomagnetic field activity is expected to be at quiet to unsettled levels during the period (05 - 07 July) with a chance for active levels as the CH HSS gradually subsides. Recent CME activity from Region 1515 is not expected to significantly disturb the field.
III. Event Probabilities 05 Jul to 07 Jul
Class M80%80%80%
Class X25%25%25%
Proton10%10%10%
PCAFgreen
IV. Penticton 10.7 cm Flux
  Observed       04 Jul 163
  Predicted   05 Jul-07 Jul  155/160/160
  90 Day Mean        04 Jul 121
V. Geomagnetic A Indices
  Observed Afr/Ap 03 Jul  011/011
  Estimated     Afr/Ap 04 Jul  010/012
  Predicted    Afr/Ap 05 Jul-07 Jul  007/008-009/008-007/008
VI. Geomagnetic Activity Probabilities 05 Jul to 07 Jul
A. Middle Latitudes
Active25%20%25%
Minor storm05%05%05%
Major-severe storm01%01%01%
B. High Latitudes
Active15%15%15%
Minor storm30%15%30%
Major-severe storm30%10%30%

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