Viewing archive of Thursday, 27 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 27 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 148 Issued at 2200Z on 27 May 2004IA. Analysis of Solar Active Regions and Activity from 26-2100Z to 27-2100Z Solar activity was at low levels today. Region 618
(S10W27) produced a C1/Sf flare that occurred at 27/0027Z. This
region continued to show decay in magnetic complexity and sunspot
area during the period. The delta structure near region center
remains intact. Region 619 (S09W89) managed to produce a C1 flare
just before the sunspots vanished in white light. No new regions
were numbered today.
IB. Solar Activity Forecast
Solar activity is expected to be at
low levels. Region 618 continues to exhibit the potential for
producing isolated M-class flares.
IIA. Geophysical Activity Summary 26-2100Z to 27-2100Z
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. 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 28 May to 30 May
| Class M | 40% | 40% | 40% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 27 May 102 Predicted 28 May-30 May 100/100/105 90 Day Mean 27 May 105
V. Geomagnetic A Indices
Observed Afr/Ap 26 May 003/006 Estimated Afr/Ap 27 May 004/008 Predicted Afr/Ap 28 May-30 May 004/010-004/010-008/012
VI. Geomagnetic Activity Probabilities 28 May to 30 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 05% | 01% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 25% |
| Minor storm | 10% | 10% | 15% |
| Major-severe storm | 05% | 05% | 05% |
All times in UTC
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