Viewing archive of Friday, 13 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 13 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 195 Issued at 2200Z on 13 Jul 2012IA. Analysis of Solar Active Regions and Activity from 12-2100Z to 13-2100Z
Solar activity has been at low levels for the past 24
hours. Region 1521 (S21W34) has been the most active region,
producing multiple low-level C-class events. Region 1520 (S16W23)
has decayed in area but remains the most magnetically complex region
on the disk, still classified as a beta-gamma-delta. The other four
numbered active sunspot regions have remained quiet and rather
stable. A CME was observed in LASCO C2 imagery at 13/0224Z. After
analysis, the CME was determined to not be geoeffective.
IB. Solar Activity Forecast
Solar activity is expected to be at
low to moderate levels for the next three days (14-16 July), as
Regions 1520 and 1521 continue to evolve and rotate toward the west
limb.
IIA. Geophysical Activity Summary 12-2100Z to 13-2100Z
The geomagnetic field has been at quiet levels for the past 24 hours.
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 minor storm levels with a slight chance
for isolated periods at major storm levels on day one (14 July), due
the arrival of the 12 July CME. Unsettled to active levels with a
chance for minor storm periods are expected on day two (15 July), as
effects of the CME continue. A return to predominantly quiet levels
is expected on day three (16 July).
III. Event Probabilities 14 Jul to 16 Jul
| Class M | 70% | 70% | 70% |
| Class X | 20% | 20% | 20% |
| Proton | 99% | 99% | 50% |
| PCAF | red | ||
IV. Penticton 10.7 cm Flux
Observed 13 Jul 147 Predicted 14 Jul-16 Jul 145/135/125 90 Day Mean 13 Jul 128
V. Geomagnetic A Indices
Observed Afr/Ap 12 Jul 011/014 Estimated Afr/Ap 13 Jul 003/003 Predicted Afr/Ap 14 Jul-16 Jul 017/034-014/018-004/005
VI. Geomagnetic Activity Probabilities 14 Jul to 16 Jul
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 35% | 05% |
| Minor storm | 15% | 15% | 01% |
| Major-severe storm | 15% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 15% | 15% |
| Minor storm | 30% | 20% | 10% |
| Major-severe storm | 60% | 20% | 05% |
All times in UTC
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