Viewing archive of Tuesday, 17 February 2009
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 2009 Feb 17 2201 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 048 Issued at 2200Z on 17 Feb 2009IA. Analysis of Solar Active Regions and Activity from 16-2100Z to 17-2100Z Solar activity was very low. No flares were observed
during the period. The visible disk remains spotless.
IB. Solar Activity Forecast
Solar activity is expected to be very
low.
IIA. Geophysical Activity Summary 16-2100Z to 17-2100Z
The geomagnetic field was quiet. During the period, solar wind speed
steadily decreased from about 440 km/s to near 375 km/s. The
greater than 2 MeV electron flux at geosynchronous orbit was at high
levels again today.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be at quiet levels for the next three days (18 - 20
February)
III. Event Probabilities 18 Feb to 20 Feb
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 17 Feb 071 Predicted 18 Feb-20 Feb 070/070/070 90 Day Mean 17 Feb 069
V. Geomagnetic A Indices
Observed Afr/Ap 16 Feb 002/003 Estimated Afr/Ap 17 Feb 002/004 Predicted Afr/Ap 18 Feb-20 Feb 005/005-005/005-005/005
VI. Geomagnetic Activity Probabilities 18 Feb to 20 Feb
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 05% | 05% | 05% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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