Joint USAF/NOAA Report of Solar and Geophysical Activity 27 May 2007
Product: Report of Solar-Geophysical Activity
Issued: 2007 May 27 2200 UTC
Prepared jointly by the U.S. Dept. of Commerce, NOAA,
Space Environment Center and the U.S. Air Force.
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 147 Issued at 2200Z on 27 May 2007
IA. Analysis of Solar Active Regions and Activity from 26/2100Z to 27/2100Z: Solar activity has been very low.
IB. Solar Activity Forecast: Solar activity is expected to be very low.
IIA. Geophysical Activity Summary 26/2100Z to 27/2100Z: The geomagnetic field has been quiet to unsettled. The greater than 2 MeV electron flux at geosynchronous orbit reached high levels again today.
IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be quiet to unsettled May 28. There remains the possibility of isolated active periods. The geomagnetic field is expected to be quiet May 29 – 30.
III. Event Probabilities 28 May-30 May
- Class M 01/01/01
- Class X 01/01/01
- Proton 01/01/01
- PCAF Green
IV. Penticton 10.7 cm Flux
- Observed 27 May 067
- Predicted 28 May-30 May 065/065/065
- 90 Day Mean 27 May 073
V. Geomagnetic A Indices
- Observed Afr/Ap 26 May 010/016
- Estimated Afr/Ap 27 May 010/015
- Predicted Afr/Ap 28 May-30 May 006/010-003/005-003/005
VI. Geomagnetic Activity Probabilities 28 May-30 May
A. Middle Latitudes
- Active 20/15/15
- Minor storm 10/05/05
- Major-severe storm 01/01/01
B. High Latitudes
- Active 25/20/20
- Minor storm 15/10/10
- Major-severe storm 10/01/01