Viewing archive of Tuesday, 25 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 25 2200 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 25 May 2004IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z Solar activity was at low levels. Region 615 (N17W53)
produced the largest flare of the period, a C1 x-ray event that
occurred at 24/2239Z. Region 618 (S10W00) was limited to B-class
flare production this period while two delta structures remain
evident across the magnetic region center in this beta-gamma-delta
complex. Little change was noted in sunspot area today. A 20
degree filament that was seen near the north-center of the disk
became active just before 24/1800Z, and had fully erupted by
24/1930Z. This disappearing filament resulted in a northward
directed CME as seen on LASCO imagery and appears to have little
geoeffective potential. No new regions were numbered today.
IB. Solar Activity Forecast
Solar activity is expected to be at
low to moderate levels. Region 618 remains capable of producing
isolated M-class flare activity.
IIA. Geophysical Activity Summary 24-2100Z to 25-2100Z
The geomagnetic field was at quiet to unsettled levels.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be at quiet to unsettled levels throughout the period.
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 26 May to 28 May
| Class M | 50% | 50% | 50% |
| Class X | 10% | 10% | 10% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 25 May 102 Predicted 26 May-28 May 100/100/105 90 Day Mean 25 May 105
V. Geomagnetic A Indices
Observed Afr/Ap 24 May 008/011 Estimated Afr/Ap 25 May 007/010 Predicted Afr/Ap 26 May-28 May 007/010-010/010-010/010
VI. Geomagnetic Activity Probabilities 26 May to 28 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 20% | 20% |
| Minor storm | 05% | 10% | 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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