Viewing archive of Sunday, 23 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 23 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 144 Issued at 2200Z on 23 May 2004IA. Analysis of Solar Active Regions and Activity from 22-2100Z to 23-2100Z
Solar activity was low. Region 618 (S10E26) produced
four low-level C-class events during the past 24 hours. The group
continues to grow and is maintaining magnetic complexity with a
delta configuration in the leader spots. New regions 619 (S09W37)
and 620 (S15E34) emerged on the disk today as small sunspot groups.
IB. Solar Activity Forecast
Solar activity is expected to be low
to moderate. There is a fair chance for an M-class event from Region
618, given the continuing growth trend and the magnetic complexity
of the group.
IIA. Geophysical Activity Summary 22-2100Z to 23-2100Z
The geomagnetic field was mostly unsettled during the past 24 hours.
The high speed solar wind stream continues to persist (similar to
the last 3-4 days) with speeds typically ranging from 450 to 500
km/s.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to unsettled for the next three days (24-26
May). The currently enhanced solar wind velocity is expected to
decline to nominal levels over the next 24 hours. 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 24 May to 26 May
| Class M | 50% | 50% | 50% |
| Class X | 10% | 10% | 10% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 23 May 104 Predicted 24 May-26 May 105/105/100 90 Day Mean 23 May 105
V. Geomagnetic A Indices
Observed Afr/Ap 22 May 007/011 Estimated Afr/Ap 23 May 010/010 Predicted Afr/Ap 24 May-26 May 005/008-007/008-007/008
VI. Geomagnetic Activity Probabilities 24 May to 26 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 20% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 05% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 25% | 25% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 05% | 05% | 05% |
All times in UTC
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