Viewing archive of Wednesday, 19 May 2004
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 2004 May 19 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 140 Issued at 2200Z on 19 May 2004IA. Analysis of Solar Active Regions and Activity from 18-2100Z to 19-2100Z Solar activity was low. Two small C-class flares
occurred in an unnumbered region rotating onto the disk near SE10.
Regions currently on the visible disk have been relatively quiet
with only a few B-class flares observed.
IB. Solar Activity Forecast
Solar activity is expected to be low.
Sunspots associated with the new region at the southeast limb are
expected to rotate into view within the next 24 hours. B and C-class
flares are most likely to occur in this new region.
IIA. Geophysical Activity Summary 18-2100Z to 19-2100Z
The geomagnetic field was mostly quiet to unsettled. An isolated
active period occurred at some locations at 19/1500-1800 UTC.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to unsettled. NOTE: The ACE spacecraft orbit
will bring ACE nearly in line with the Sun from about May 30 to June
2, 2004. During that time solar radio noise is expected to interfere
with spacecraft telemetry resulting in the loss of solar wind
plasma, magnetic field, and particle data.
III. Event Probabilities 20 May to 22 May
| Class M | 30% | 30% | 30% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 19 May 109 Predicted 20 May-22 May 110/110/100 90 Day Mean 19 May 105
V. Geomagnetic A Indices
Observed Afr/Ap 18 May 004/004 Estimated Afr/Ap 19 May 008/010 Predicted Afr/Ap 20 May-22 May 008/015-008/010-008/015
VI. Geomagnetic Activity Probabilities 20 May to 22 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 30% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 05% | 05% | 05% |
All times in UTC
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