Viewing archive of Saturday, 14 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 14 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 196 Issued at 2200Z on 14 Jul 2012

IA. Analysis of Solar Active Regions and Activity from 13-2100Z to 14-2100Z

Solar activity has been at moderate levels for the past 24 hours. Region 1521 (S21W47) produced an M1/1f x-ray event at 0458Z. As well as being partially responsible for todays M-class flare, Region 1520 (S17W35) also produced a C2/Sf event at 1410Z with an associated 150 sfu Tenflare. Elsewhere on the solar disk, Region 1519 (S16W56) and Region 1523 (S28E04) grew both in area and magnetic complexity, however, both have remained quiet and stable. No Earth directed CMEs were observed.
IB. Solar Activity Forecast
Solar activity is expected to be at low to moderate levels for the next three days (15-17 July) as Region 1520 and Region 1521 continue to evolve.
IIA. Geophysical Activity Summary 13-2100Z to 14-2100Z
The geomagnetic field began the period at quiet levels until around 1811Z, when a sudden impulse of 27 nT was observed by the Boulder magnetometer. 43 minutes earlier, at 1728Z, measurements made by the ACE spacecraft indicated a shock arrival. Solar wind speeds increased from 350 km/s to around 630 km/s and the IMF (total field) increased from 4 nT to around 17 nT, with extended periods of the Bz component hovering around -12 nT. All of these signatures are congruent with the arrival of a CME at ACE and later here at Earth. After the arrival of the CME, an increase from quiet to minor storm levels was observed. A greater than 10 MeV proton event began, reached a peak of 96 pfu at 12/2225Z, and is still in progress. The greater than 2 MeV electron flux at geosynchronous orbit reached high levels during the period.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet to active levels with a slight chance for minor storms on day one (15 July), as CME effects continue. Predominantly quiet levels are expected on days two and three (16-17 July).
III. Event Probabilities 15 Jul to 17 Jul
Class M70%70%70%
Class X15%15%15%
Proton99%50%20%
PCAFred
IV. Penticton 10.7 cm Flux
  Observed       14 Jul 148
  Predicted   15 Jul-17 Jul  140/130/120
  90 Day Mean        14 Jul 128
V. Geomagnetic A Indices
  Observed Afr/Ap 13 Jul  004/003
  Estimated     Afr/Ap 14 Jul  010/018
  Predicted    Afr/Ap 15 Jul-17 Jul  015/022-007/008-006/005
VI. Geomagnetic Activity Probabilities 15 Jul to 17 Jul
A. Middle Latitudes
Active40%15%05%
Minor storm15%05%01%
Major-severe storm01%01%01%
B. High Latitudes
Active15%15%15%
Minor storm20%20%10%
Major-severe storm25%20%05%

All times in UTC

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