Viewing archive of Tuesday, 26 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 26 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 207 Issued at 2200Z on 26 Jul 2011IA. Analysis of Solar Active Regions and Activity from 25-2100Z to 26-2100Z Solar activity was low during the past 24 hours.
Region 1260 (N20E45) produced the only C-class event of the period,
a C1 flare at 26/0339Z. Region 1260 has grown significantly and is
classified as a Dao type spot group. New Region 1261 (N16E74) was
numbered today. This region is still rotating onto the visible disk
and initial observations indicated a Dho type spot group. Both
regions were magnetically simple.
IB. Solar Activity Forecast
Solar activity is expected to be very
low to low for the next three days (27-29 July). Both Regions 1260
and 1261 are likely to produce C-class activity, with the remote
possibility of an isolated M-class event.
IIA. Geophysical Activity Summary 25-2100Z to 26-2100Z
The geomagnetic field has been quiet during 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 quiet on day one (27 July). Days two and three (28-29
July) are expected to be quiet to unsettled with isolated active
periods. The increase in activity is forecast due to the expected
arrival of a recurrent coronal hole high speed stream.
III. Event Probabilities 27 Jul to 29 Jul
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 26 Jul 094 Predicted 27 Jul-29 Jul 095/097/099 90 Day Mean 26 Jul 095
V. Geomagnetic A Indices
Observed Afr/Ap 25 Jul 010/012 Estimated Afr/Ap 26 Jul 004/005 Predicted Afr/Ap 27 Jul-29 Jul 005/005-010/012-012/012
VI. Geomagnetic Activity Probabilities 27 Jul to 29 Jul
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 05% | 15% | 15% |
| Minor storm | 01% | 05% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 05% | 15% | 25% |
| Minor storm | 01% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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