Viewing archive of Sunday, 10 July 2011
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 2011 Jul 10 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 191 Issued at 2200Z on 10 Jul 2011IA. Analysis of Solar Active Regions and Activity from 09-2100Z to 10-2100Z Solar activity has been at very low levels for the past
24 hours. Region 1247 (S18W15) grew in sunspot count and magnetic
complexity but has remained stable and quiet. Region 1250 (S25E48)
emerged on the disk early in the period and has grown rapidly to the
second largest group on the visible disk. Two CMEs were observed
during the period but after careful analysis, both CMEs were
determined to be backsided and non-geoeffective.
IB. Solar Activity Forecast
Solar activity is expected to be at
low levels with a slight chance for M-class events for the next
three days (11-13 July) as both Region 1247 and 1250 continue to
grow and evolve.
IIA. Geophysical Activity Summary 09-2100Z to 10-2100Z
The geomagnetic field has been at quiet to active levels for the past
24 hours. The elevated levels are due to the continued effects of a
coronal hole high speed stream (CH HSS). Solar wind speeds, as
measured by the ACE spacecraft, peaked at around 540 km/s but has
since started to decay to around 450 km/s.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to remain quiet to unsettled for day one (11 July) as the
effects of the CH HSS wane. On day two (12 July), levels ranging
from quiet to active are expected due to the combined effects from
another CH HSS and the CME observed on 09 July. A return to quiet to
unsettled levels is expected on day three (13 July) as effects from
both events wane.
III. Event Probabilities 11 Jul to 13 Jul
| Class M | 10% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 10 Jul 091 Predicted 11 Jul-13 Jul 092/094/094 90 Day Mean 10 Jul 099
V. Geomagnetic A Indices
Observed Afr/Ap 09 Jul 010/012 Estimated Afr/Ap 10 Jul 010/010 Predicted Afr/Ap 11 Jul-13 Jul 007/007-012/012-007/007
VI. Geomagnetic Activity Probabilities 11 Jul to 13 Jul
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 30% | 20% |
| Minor storm | 05% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 40% | 25% |
| Minor storm | 05% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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