Viewing archive of Saturday, 28 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 28 2201 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 059 Issued at 2200Z on 28 Feb 2009IA. Analysis of Solar Active Regions and Activity from 27-2100Z to 28-2100Z Solar activity was very low with no flares observed.
The visible solar disk was spotless. A slow moving, asymmetric CME
was first observed in LASCO C2 imagery lifting off the NW limb at
27/1931Z.
IB. Solar Activity Forecast
Solar activity is expected to be very
low.
IIA. Geophysical Activity Summary 27-2100Z to 28-2100Z
The geomagnetic field was at mostly quiet levels. Solar winds speeds
decayed steadily throughout the summary period from a high of near
700 km/s to a low of about 500 km/s. The Bz component of the IMF
remained mostly north (+2 to +4 nT) for a majority of the period.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet for days one and two of the forecast period (01
- 02 March). By day three (03 March), activity levels are expected
to increase to quiet to unsettled, with isolated active periods
possible at high latitudes. This increase in activity is due to a
coronal hole high speed stream that is expected to rotate into a
geoeffective position. The CME mentioned earlier is not expected to
be geoeffective.
III. Event Probabilities 01 Mar to 03 Mar
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 28 Feb 071 Predicted 01 Mar-03 Mar 070/070/070 90 Day Mean 28 Feb 070
V. Geomagnetic A Indices
Observed Afr/Ap 27 Feb 007/008 Estimated Afr/Ap 28 Feb 005/006 Predicted Afr/Ap 01 Mar-03 Mar 005/005-005/005-008/008
VI. Geomagnetic Activity Probabilities 01 Mar to 03 Mar
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 05% | 05% | 15% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 20% |
| Minor storm | 01% | 01% | 10% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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