Viewing archive of Friday, 25 December 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 Dec 25 2201 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 359 Issued at 2200Z on 25 Dec 2009IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z Solar activity was very low. No flares were observed.
The visible disk was spotless.
IB. Solar Activity Forecast
Solar activity is expected to be very
low.
IIA. Geophysical Activity Summary 24-2100Z to 25-2100Z
The geomagnetic field was quiet. Solar wind observations from the ACE
satellite decreased gradually after 24/2235Z, from 380 km/s to 282
km/s at 25/1457Z. Velocities then increased to 354 km/s at 25/1708Z
as the density increased to a peak of 13 p/cc. The interplanetary
magnetic field (IMF) increased, with the total field reaching +10 nT
at 25/1852Z. The southward component of the IMF ranged between -8 nT
and +7 nT, with the peak of -8 nT at 25/1609Z. This activity is
consistent with the arrival of the partial halo coronal mass
ejection (CME) observed on 22 December.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be predominantly quiet, with isolated unsettled periods
possible at high latitudes, on day one (26 December). Quiet levels
are expected on days two and three (27-28 December).
III. Event Probabilities 26 Dec to 28 Dec
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 25 Dec 076 Predicted 26 Dec-28 Dec 072/072/072 90 Day Mean 25 Dec 074
V. Geomagnetic A Indices
Observed Afr/Ap 24 Dec 001/002 Estimated Afr/Ap 25 Dec 003/005 Predicted Afr/Ap 26 Dec-28 Dec 007/007-005/005-005/005
VI. Geomagnetic Activity Probabilities 26 Dec to 28 Dec
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 05% | 05% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 05% | 05% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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