- Press Release
- Oct 5, 2022
Joint USAF/NOAA Report of Solar and Geophysical Activity 28 Dec 2005
Product: Report of Solar-Geophysical Activity
Issued: 2005 Dec 28 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 362 Issued at 2200Z on 28 Dec 2005
IA. Analysis of Solar Active Regions and Activity from 27/2100Z to 28/2100Z: Solar activity was at very low levels today. Region 843 produced the largest flare of the period, a B9 x-ray flare which occurred at 28/1125Z. No new regions were numbered today.
IB. Solar Activity Forecast: Solar activity is expected to remain at very low levels.
IIA. Geophysical Activity Summary 27/2100Z to 28/2100Z: The geomagnetic field ranged from unsettled to minor storm levels. A recurrent trans-equatorial high speed coronal hole stream was responsible for the elevated conditions. The greater than 2 MeV electron flux at geosynchronous orbit reached high levels today.
IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at predominantly unsettled to active levels with isolated minor storm periods possible through 29 December. A return to quiet to unsettled levels is expected on 30 and 31 December as the coronal hole moves out of geoeffective position.
III. Event Probabilities 29 Dec-31 Dec
- Class M 01/01/01
- Class X 01/01/01
- Proton 01/01/01
- PCAF green
IV. Penticton 10.7 cm Flux
- Observed 28 Dec 089
- Predicted 29 Dec-31 Dec 090/090/090
- 90 Day Mean 28 Dec 084
V. Geomagnetic A Indices
- Observed Afr/Ap 27 Dec 010/018
- Estimated Afr/Ap 28 Dec 015/020
- Predicted Afr/Ap 29 Dec-31 Dec 012/020-008/015-005/010
VI. Geomagnetic Activity Probabilities 29 Dec-31 Dec A. Middle Latitudes
- Active 25/20/15
- Minor storm 10/05/01
- Major-severe storm 05/01/01
B. High Latitudes
- Active 40/35/25
- Minor storm 25/15/10
- Major-severe storm 10/05/05