Viewing archive of Thursday, 10 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 10 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 069 Issued at 2200Z on 10 Mar 2011IA. Analysis of Solar Active Regions and Activity from 09-2100Z to 10-2100Z Solar activity was high. An X1/2b flare was observed
at 09/2323Z from Region 1166 (N08W26). This region grew slightly
during the period and was classified as an Ekc type sunspot group
with Beta-Gamma magnetic characteristics. Region 1169 (N20E04)
decayed slightly and ended the period as an Eai type group with
Beta-Gamma characteristics. The remainder of the disk was quiet and
stable.
IB. Solar Activity Forecast
Solar activity is expected to be
moderate with a slight chance for an X-class x-ray event from Region
1166 or 1169 for the next three days (11-13 March).
IIA. Geophysical Activity Summary 09-2100Z to 10-2100Z
The geomagnetic field was unsettled to active at middle latitudes and
briefly reached severe storm levels at high latitudes. The
geomagnetic disturbance was likely caused by the arrival of the 07
March CME. The CME shock was observed at the ACE spacecraft at
approximately 06Z accompanied by a slight increase in wind speed to
360 km/s. The Bz component of the interplanetary magnetic field
turned southward and averaged -9nT from 10/06Z to 10/09Z. The 10
MeV proton greater than 10 pfu event that began 08/0105Z ended at
10/1210Z with a maximum flux of 50 pfu at 08/0800Z.
IIB. Geophysical Activity Forecast
Geomagnetic activity is
expected to be unsettled to active for the next three days with a
slight chance for minor to major storm conditions at high latitudes.
Lingering effects from the CME passage are expected on days one and
two (11-12 March) and a recurrent coronal hole high speed stream is
expected to become geoeffective on day three (13 March).
III. Event Probabilities 11 Mar to 13 Mar
| Class M | 50% | 50% | 50% |
| Class X | 10% | 10% | 10% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 10 Mar 131 Predicted 11 Mar-13 Mar 130/130/125 90 Day Mean 10 Mar 092
V. Geomagnetic A Indices
Observed Afr/Ap 09 Mar 002/004 Estimated Afr/Ap 10 Mar 012/018 Predicted Afr/Ap 11 Mar-13 Mar 010/018-007/010-010/012
VI. Geomagnetic Activity Probabilities 11 Mar to 13 Mar
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 15% | 20% |
| Minor storm | 15% | 05% | 15% |
| Major-severe storm | 10% | 01% | 10% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 35% | 35% | 30% |
| Minor storm | 20% | 10% | 15% |
| Major-severe storm | 10% | 01% | 10% |
All times in UTC
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