Viewing archive of Monday, 24 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 24 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 145 Issued at 2200Z on 24 May 2004IA. Analysis of Solar Active Regions and Activity from 23-2100Z to 24-2100Z Solar activity was at low levels today. Region 618
(S10E13) produced the largest flare of the period, a C4 x-ray event
that occurred at 24/1104Z. There was a continued growth in sunspot
area and the total spot count today. A continued emergence of flux
now shows several delta structures near region center in this
magnetic beta-gamma-delta group. The remaining active regions were
quiescent today. No new regions were numbered today.
IB. Solar Activity Forecast
Solar activity is expected to be at
low to moderate levels. Due to continued growth in magnetic
complexity, Region 618 has the potential of producing M-class flare
activity.
IIA. Geophysical Activity Summary 23-2100Z to 24-2100Z
The geomagnetic field ranged from quiet to active levels. The high
speed solar wind stream continues to persist while solar wind speeds
were exceeding 500 km/s late in the period.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be at predominantly quiet to unsettled levels. Isolated
active conditions are possible through 25 May as the geoeffective
high speed coronal hole stream begins to wane. 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 25 May to 27 May
| Class M | 50% | 50% | 50% |
| Class X | 10% | 10% | 10% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 24 May 105 Predicted 25 May-27 May 105/105/100 90 Day Mean 24 May 105
V. Geomagnetic A Indices
Observed Afr/Ap 23 May 009/012 Estimated Afr/Ap 24 May 012/015 Predicted Afr/Ap 25 May-27 May 007/010-007/010-010/010
VI. Geomagnetic Activity Probabilities 25 May to 27 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 20% |
| Minor storm | 05% | 05% | 10% |
| Major-severe storm | 05% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 20% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 05% | 05% | 05% |
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