Viewing archive of Monday, 28 March 2011
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 2011 Mar 28 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 087 Issued at 2200Z on 28 Mar 2011IA. Analysis of Solar Active Regions and Activity from 27-2100Z to 28-2100Z Solar activity was at low levels. Region 1181 (S26E31)
produced a C1/Sf flare at 27/2326Z while Region 1176 (S17W11)
produced a C1 X-ray event at 28/1139Z. Region 1176 decayed in area
and spot count, but maintained a complex beta-gamma magnetic
configuration. Region 1183 (N15E54) indicated growth in area and
spot count as it continued to rotate onto the disk. At 28/1405Z, a
filament eruption was observed in STEREO-B EUVI 195 near N20, L=030.
Associated with this eruption was a CME that lifted off the NE limb,
first observed in LASCO C3 imagery at 28/1818Z. Due to the source of
this CME, it is not Earth-directed. No new regions were numbered
during the period.
IB. Solar Activity Forecast
Solar activity is expected to be low
all three days of the forecast period (29 - 31 March). A chance
exists all three days for isolated M-class activity.
IIA. Geophysical Activity Summary 27-2100Z to 28-2100Z
The geomagnetic field was quiet. ACE solar wind velocities remained
low and steady, only varying between 340 km/s to 370 km/s. The Bz
component of the IMF ranged between +/- 4 nT.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet for day one (29 March). By days two and three
(30 - 31 March), quiet to unsettled conditions, with isolated active
periods, are expected due to the arrival of a recurrent coronal hole
high speed stream.
III. Event Probabilities 29 Mar to 31 Mar
| Class M | 35% | 50% | 50% |
| Class X | 01% | 05% | 05% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 28 Mar 119 Predicted 29 Mar-31 Mar 120/130/135 90 Day Mean 28 Mar 097
V. Geomagnetic A Indices
Observed Afr/Ap 27 Mar 002/002 Estimated Afr/Ap 28 Mar 002/002 Predicted Afr/Ap 29 Mar-31 Mar 005/005-010/010-010/010
VI. Geomagnetic Activity Probabilities 29 Mar to 31 Mar
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 20% | 20% |
| Minor storm | 01% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 25% | 25% |
| Minor storm | 01% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
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