Viewing archive of Tuesday, 8 April 2008
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 2008 Apr 08 2203 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 099 Issued at 2200Z on 08 Apr 2008IA. Analysis of Solar Active Regions and Activity from 07-2100Z to 08-2100Z Solar activity was very low. A non Earth-directed CME
was first observed off the west limb on SOHO/LASCO C2 imagery at
08/1750Z. No new regions were numbered.
IB. Solar Activity Forecast
Solar activity is expected to be very
low.
IIA. Geophysical Activity Summary 07-2100Z to 08-2100Z
The geomagnetic field was quiet to unsettled. Solar wind velocities
remained elevated due to the continuing high speed stream.
Velocities from the ACE satellite ranged from 604 km/sec to 778
km/sec during the past 24 hours. IMF Bz continued to fluctuate
between -4.9 nT to 5.7 nT. The 2 MeV electron flux at geosynchronous
orbit reached high levels today.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to unsettled with isolated active conditions
for the next two days (09-10 April). Isolated minor storm levels are
possible at high latitudes during this period due to the high speed
stream. Activity is expected to be quiet to unsettled on day three
(11 April).
III. Event Probabilities 09 Apr to 11 Apr
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 08 Apr 070 Predicted 09 Apr-11 Apr 070/070/070 90 Day Mean 08 Apr 072
V. Geomagnetic A Indices
Observed Afr/Ap 07 Apr 009/012 Estimated Afr/Ap 08 Apr 007/010 Predicted Afr/Ap 09 Apr-11 Apr 008/010-008/010-005/005
VI. Geomagnetic Activity Probabilities 09 Apr to 11 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 15% |
| Minor storm | 05% | 05% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 25% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 05% | 05% | 01% |
All times in UTC
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