- Press Release
- Sep 26, 2022
Joint USAF/NOAA Report of Solar and Geophysical Activity 26 May 2004
Prepared jointly by the U.S. Dept. of Commerce, NOAA,
Space Environment Center and the U.S. Air Force.
Updated 2004 May 26 2210 UTC
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 147 Issued at 2200Z on 26 May 2004
IA. Analysis of Solar Active Regions and Activity from 25/2100Z
to 26/2100Z: Solar activity decreased to very low levels today.
Region 618 (S10W13) was limited to the production of several B-class
flares today. This region underwent decay during the period however
it still maintains a complex beta-gamma-delta magnetic structure.
Region 619 (S09E76) enhanced the x-ray flux late in the period as
surges and plague fluctuations were evident in H-alpha from near
region center. No new regions were numbered today.
IB. Solar Activity Forecast: Solar activity is expected to be at
low levels. Region 618 has the potential to produce an isolated
IIA. Geophysical Activity Summary 25/2100Z to 26/2100Z:
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 27 May-29 May
- Class M 50/50/50
- Class X 10/10/10
- Proton 05/05/05
- PCAF green
IV. Penticton 10.7 cm Flux
- Observed 26 May 103
- Predicted 27 May-29 May 100/105/105
- 90 Day Mean 26 May 105
V. Geomagnetic A Indices
- Observed Afr/Ap 25 May 005/008
- Estimated Afr/Ap 26 May 003/008
- Predicted Afr/Ap 27 May-29 May 006/008-006/010-004/010
VI. Geomagnetic Activity Probabilities 27 May-29 May
A. Middle Latitudes
- Active 15/15/10
- Minor storm 05/05/05
- Major-severe storm 01/01/01
B. High Latitudes
- Active 15/20/20
- Minor storm 05/10/10
- Major-severe storm 05/05/05