Viewing archive of Saturday, 5 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 05 2203 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 096 Issued at 2200Z on 05 Apr 2008IA. Analysis of Solar Active Regions and Activity from 04-2100Z to 05-2100Z Solar activity was very low. Spotless plage Region 989
(S11W67) produced an isolated low-level B-class flare. SOHO/LASCO
images showed a halo CME, first visible in C2 at 05/1626Z. The CME
appeared to be from the back side, based on STEREO Ahead EUVI 195
images and the GOES- 10 X-ray signature. No new active regions were
numbered.
IB. Solar Activity Forecast
Solar activity is expected to be very
low.
IIA. Geophysical Activity Summary 04-2100Z to 05-2100Z
Geomagnetic field activity ranged from quiet to major storm levels
with a Kp = 6 observed during 05/1500 - 1800Z. ACE measurements
indicated Earth entered a fast solar wind flow from a recurrent
low-latitude coronal hole in the southern hemisphere. Solar wind
velocities increased during the period with a peak of 671 km/sec
detected at 05/1634Z. IMF Bz reached a minimum of -7 nT at 05/1441Z.
The greater than 2 MeV electron flux at geosynchronous orbit briefly
reached high levels during the period.
IIB. Geophysical Activity Forecast
Geomagnetic field activity is
expected to be at unsettled to minor storm levels on day 1 (06
April) with major storm levels possible at high latitudes. Activity
is expected to decrease to unsettled to active levels during days 2
- 3 (07 - 08 April) as coronal hole effects persist.
III. Event Probabilities 06 Apr to 08 Apr
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 05 Apr 071 Predicted 06 Apr-08 Apr 070/070/070 90 Day Mean 05 Apr 073
V. Geomagnetic A Indices
Observed Afr/Ap 04 Apr 008/011 Estimated Afr/Ap 05 Apr 015/025 Predicted Afr/Ap 06 Apr-08 Apr 012/020-010/012-010/012
VI. Geomagnetic Activity Probabilities 06 Apr to 08 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 25% | 25% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 50% | 30% | 30% |
| Minor storm | 25% | 10% | 10% |
| Major-severe storm | 05% | 01% | 01% |
All times in UTC
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