Viewing archive of Wednesday, 16 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 16 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 075 Issued at 2200Z on 16 Mar 2011IA. Analysis of Solar Active Regions and Activity from 15-2100Z to 16-2100Z Solar activity was at low levels. During the period,
Region 1169 (N17W75) produced a few low-level C-class events
including a long-duration (LDE) C3/Sf flare at 16/2034Z. The flare
was still in progress at the time of this writing. Associated with
this LDE was a partial-halo CME, first observed in LASCO C2 imagery
at 16/1912Z. A preliminary plane-of-sky estimate indicated a
velocity near 500 km/s. The region maintained its beta-gamma
magnetic classification as it approached the west limb. New Region
1173 (S28E39) emerged on the disk as a bi-polar C-type group. The
Penticton 10.7 cm flux and the 90-day mean are estimated for today
(16 March) due to flare enhanced readings.
IB. Solar Activity Forecast
Solar activity is expected to be low
with a chance for an M-class event from Region 1169 for the next two
days (17 - 18 March). On day three (19 March), activity is expected
to be very low with a chance for a C-class event.
IIA. Geophysical Activity Summary 15-2100Z to 16-2100Z
The geomagnetic field was quiet. Observations from the ACE satellite
indicated solar wind velocities averaged about 370 km/s while the Bz
component of the interplanetary magnetic field was mostly north at
+1 to +5 nT.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet for the next three days (17 - 19 March).
III. Event Probabilities 17 Mar to 19 Mar
| Class M | 25% | 05% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 16 Mar 095 Predicted 17 Mar-19 Mar 090/085/080 90 Day Mean 16 Mar 094
V. Geomagnetic A Indices
Observed Afr/Ap 15 Mar 000/000 Estimated Afr/Ap 16 Mar 001/002 Predicted Afr/Ap 17 Mar-19 Mar 005/005-005/005-005/005
VI. Geomagnetic Activity Probabilities 17 Mar to 19 Mar
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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