Viewing archive of Wednesday, 9 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 09 2203 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 100 Issued at 2200Z on 09 Apr 2008IA. Analysis of Solar Active Regions and Activity from 08-2100Z to 09-2100Z Solar activity was very low. A CME from beyond the SW
limb was first observed on SOHO/LASCO imagery at 09/1026Z. This CME
appears to be back-sided and is not expected to be geoeffective. The
visible disk remains spotless.
IB. Solar Activity Forecast
Solar activity is expected to be very
low.
IIA. Geophysical Activity Summary 08-2100Z to 09-2100Z
The geomagnetic field ranged from quiet to active conditions. Solar
wind velocities, observed on the ACE satellite, remained at elevated
levels due to the continued high speed stream. Velocities ranged
from 635 km/sec to 778 km/sec during the past 24 hours, while the
IMF Bz fluctuated between 4.2 nT to -3.6 nT. The greater than 2 MeV
electron flux at geosynchronous orbit reached high levels again
today.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to unsettled with isolated active levels at
mid-latitudes and isolated minor to major storm conditions at high
latitudes for day one (10 April), due to persistent effects from the
high speed stream. Conditions should return to quiet to unsettled
levels for day two (11 April) as the influence of the high speed
stream is expected to wane. Conditions should be predominantly quiet
on day three (12 April).
III. Event Probabilities 10 Apr to 12 Apr
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 09 Apr 068 Predicted 10 Apr-12 Apr 070/070/070 90 Day Mean 09 Apr 072
V. Geomagnetic A Indices
Observed Afr/Ap 08 Apr 006/009 Estimated Afr/Ap 09 Apr 009/012 Predicted Afr/Ap 10 Apr-12 Apr 010/010-007/008-005/005
VI. Geomagnetic Activity Probabilities 10 Apr to 12 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 15% | 10% |
| Minor storm | 05% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 25% | 15% |
| Minor storm | 15% | 10% | 05% |
| Major-severe storm | 10% | 05% | 01% |
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