Viewing archive of Saturday, 7 April 2012
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 2012 Apr 07 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 098 Issued at 2200Z on 07 Apr 2012IA. Analysis of Solar Active Regions and Activity from 06-2100Z to 07-2100Z Solar activity was low. Region 1452 (N17W23) produced a
C2 x-ray flare and occasional B-class flares. It gradually decayed
to a small B-type group during the period. Region 1450 (N15W59)
gradually decayed to a C-type group during the period and produced
an isolated B-class flare. However, it retained a beta-gamma
magnetic configuration. No new regions were numbered.
IB. Solar Activity Forecast
Solar activity is expected to be very
low to low during days 1 - 3 (08 - 10 April) with isolated C-class
flares likely from Region 1452.
IIA. Geophysical Activity Summary 06-2100Z to 07-2100Z
The geomagnetic field was quiet to active with minor to major storm
periods at high latitudes during 07/0900 - 1500Z. This activity was
associated with a period of sustained southward IMF Bz, enhanced IMF
Bt, and increased solar wind speeds.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be at mostly quiet levels until late on day 1 (08
April). A CME passage is expected to commence late on day 1 (from
the partial-halo CME observed on 05 April). Consequently, activity
is expected to increase to unsettled levels beginning late on day 1
and continue until early on day 3 (10 April). There will also be a
chance for active levels on day 2 (09 April) along with a chance for
minor storm levels at high latitudes. Activity is expected to
decrease to quiet to unsettled levels on day 3 as CME effects
subside.
III. Event Probabilities 08 Apr to 10 Apr
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 07 Apr 099 Predicted 08 Apr-10 Apr 100/100/100 90 Day Mean 07 Apr 116
V. Geomagnetic A Indices
Observed Afr/Ap 06 Apr 003/004 Estimated Afr/Ap 07 Apr 010/010 Predicted Afr/Ap 08 Apr-10 Apr 008/010-013/015-006/008
VI. Geomagnetic Activity Probabilities 08 Apr to 10 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 25% | 10% |
| Minor storm | 01% | 15% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 30% | 15% |
| Minor storm | 10% | 25% | 10% |
| Major-severe storm | 05% | 10% | 05% |
All times in UTC
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