Viewing archive of Tuesday, 1 February 2005
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 2005 Feb 01 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 032 Issued at 2200Z on 01 Feb 2005IA. Analysis of Solar Active Regions and Activity from 31-2100Z to 01-2100Z Solar activity was very low. The two sunspot regions on
the visible disk, Regions 727 (S09W68) and 729 (S08E06), were quiet
and stable. A 9 degree filament erupted from near S15W16 at
01/0800Z, but there was no apparent CME on LASCO imagery. An
impressive backside full halo CME was observed on LASCO imagery at
01/1106Z. The likely source of this eruption was old Region 720
(N13, L=178), which is due to return to the visible disk on 05
February. A Type II radio sweep (660 km/s) and a 245 MHz burst of
9800 sfu were observed at 01/1032Z, and were likely associated with
this backside CME.
IB. Solar Activity Forecast
Solar activity is expected to be very
low. The activity level is expected to increase after 05 February
when old Region 720 returns to the visible disk.
IIA. Geophysical Activity Summary 31-2100Z to 01-2100Z
The geomagnetic field was quiet to unsettled. Solar wind speed
remains elevated, but gradually declined from near 620 km/s to 530
km/s to end the period. The greater than 2 MeV electron flux at
geosynchronous orbit was at high levels today.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to continue at quiet to unsettled levels.
III. Event Probabilities 02 Feb to 04 Feb
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 01 Feb 084 Predicted 02 Feb-04 Feb 085/085/085 90 Day Mean 01 Feb 102
V. Geomagnetic A Indices
Observed Afr/Ap 31 Jan 015/019 Estimated Afr/Ap 01 Feb 010/010 Predicted Afr/Ap 02 Feb-04 Feb 012/012-010/010-010/010
VI. Geomagnetic Activity Probabilities 02 Feb to 04 Feb
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 20% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 25% | 25% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
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