Viewing archive of Saturday, 26 May 2007
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 2007 May 26 2203 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 146 Issued at 2200Z on 26 May 2007IA. Analysis of Solar Active Regions and Activity from 25-2100Z to 26-2100Z Solar activity has been very low. The visible disk is
spotless. A slow moving CME was observed in LASCO imagery off of
the west limb and accompanied by a B1 flare at 26/1644Z.
IB. Solar Activity Forecast
Solar activity is expected to be very
low.
IIA. Geophysical Activity Summary 25-2100Z to 26-2100Z
The geomagnetic field ranged from quiet to active. The greater than
2MeV electron flux at geosynchronous orbit reached high levels again
today.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be unsettled to active on 27 May and quiet to unsettled
on 28 May. Conditions are expected to abate to quiet on 29 May as
the recurrent coronal hole high speed stream rotates past its
geoeffective position. The CME observed today from the west limb is
not expected to be geoeffective.
III. Event Probabilities 27 May to 29 May
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 26 May 068 Predicted 27 May-29 May 070/070/070 90 Day Mean 26 May 073
V. Geomagnetic A Indices
Observed Afr/Ap 25 May 009/016 Estimated Afr/Ap 26 May 012/020 Predicted Afr/Ap 27 May-29 May 012/015-006/010-003/005
VI. Geomagnetic Activity Probabilities 27 May to 29 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 20% | 20% |
| Minor storm | 15% | 10% | 05% |
| Major-severe storm | 10% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 40% | 30% | 25% |
| Minor storm | 30% | 20% | 10% |
| Major-severe storm | 15% | 10% | 01% |
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