Viewing archive of Thursday, 9 February 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 Feb 09 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 040 Issued at 2200Z on 09 Feb 2012IA. Analysis of Solar Active Regions and Activity from 08-2100Z to 09-2100Z Solar activity was at low levels due to C-class flaring
from Region 1415 (N10W73), the largest a C2/Sf at 08/2217Z. The
region showed little change as it approached the west limb. New
Region 1416 (S16E24) emerged on the disk as a D-type spot group and
produced two B9 x-ray events. No Earth-directed CMEs were observed
during the period.
IB. Solar Activity Forecast
Solar activity is expected to remain
at low levels for the next three days (10 - 12 February). A slight
chance for M-class activity exists on days two and three due to the
anticipated return of old Region 1402 (N26, L=213).
IIA. Geophysical Activity Summary 08-2100Z to 09-2100Z
The geomagnetic field was at quiet to unsettled levels with isolated
active periods observed at high latitudes. ACE satellite wind
velocities began the period at about 450 km/s and gradually
decreased to near 360 km/s through 09/1230Z. During this same time
frame, the Bz component of the interplanetary magnetic field did not
vary much beyond +/- 4 nT. By 09/1230Z, an increase in temperature,
density, velocity and Bt were recorded at ACE. These signatures
were indicative of a co-rotating interaction region in advance of a
coronal high speed stream (CH HSS). The greater than 2 MeV electron
flux at geosynchronous orbit reached high levels during the period.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be at quiet to unsettled levels with isolated high
latitude active periods on day one (10 February). This activity is
due to effects from a geoeffective CH HSS. By day two (11
February), quiet to unsettled conditions are expected as the CH HSS
rotates out of a geoeffective position. Day three (12 February) is
expected to see a return to quiet to unsettled levels with isolated
high latitude active intervals due to another CH HSS that will move
into a geoeffective position.
III. Event Probabilities 10 Feb to 12 Feb
| Class M | 05% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 09 Feb 099 Predicted 10 Feb-12 Feb 105/115/120 90 Day Mean 09 Feb 136
V. Geomagnetic A Indices
Observed Afr/Ap 08 Feb 009/010 Estimated Afr/Ap 09 Feb 007/008 Predicted Afr/Ap 10 Feb-12 Feb 006/008-004/005-006/008
VI. Geomagnetic Activity Probabilities 10 Feb to 12 Feb
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 05% | 30% |
| Minor storm | 10% | 01% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 40% | 10% | 40% |
| Minor storm | 20% | 05% | 20% |
| Major-severe storm | 01% | 01% | 01% |
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