Viewing archive of Sunday, 27 July 2003
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 2003 Jul 27 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 208 Issued at 2200Z on 27 Jul 2003IA. Analysis of Solar Active Regions and Activity from 26-2100Z to 27-2100Z Solar activity was at very low levels. Active regions
were quiescent through the period. Newly numbered Region 421
(S08E77) remains too close to the east limb for a detailed analysis
of its complexity.
IB. Solar Activity Forecast
Solar activity is expected to be at
predominantly very low levels. Based on SXI imagery Region 421 may
have the potential to produce C-class flares, pending further
analysis, as it has yet to fully rotate onto the visible disk.
IIA. Geophysical Activity Summary 26-2100Z to 27-2100Z
The geomagnetic field was at unsettled to minor storm levels. A
recurrent high speed coronal hole stream and a sustained southward
Bz are believed responsible for the elevated activity. The solar
wind speed exceeded 800 km/s at approximately 27/0600Z. NASA/ACE
data also indicates a possible transient passage very early in the
period. The greater than 2 MeV electron fluxes at geosynchronous
orbit reached moderate levels today.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be at predominantly unsettled to active levels.
Isolated minor storm conditions are possible at both mid and high
latitudes due to the effects of the high speed solar wind for days
one and two. Day three should see a decrease in the elevated solar
wind speeds and the associated effects.
III. Event Probabilities 28 Jul to 30 Jul
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 27 Jul 102 Predicted 28 Jul-30 Jul 110/115/115 90 Day Mean 27 Jul 126
V. Geomagnetic A Indices
Observed Afr/Ap 26 Jul 020/026 Estimated Afr/Ap 27 Jul 020/030 Predicted Afr/Ap 28 Jul-30 Jul 020/030-020/030-012/025
VI. Geomagnetic Activity Probabilities 28 Jul to 30 Jul
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 40% | 40% | 25% |
| Minor storm | 25% | 25% | 10% |
| Major-severe storm | 10% | 10% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 40% | 40% | 35% |
| Minor storm | 35% | 35% | 30% |
| Major-severe storm | 20% | 20% | 15% |
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