Viewing archive of Sunday, 11 February 2001
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 2001 Feb 11 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 042 Issued at 2200Z on 11 Feb 2001IA. Analysis of Solar Active Regions and Activity from 10-2100Z to 11-2100Z Solar activity continued low. A C6/1f flare erupted
near the location of spotless plage 9346 (N18W80), at 0123 UTC. A
type II sweep and a halo CME occurred in conjunction with the event.
Region 9338 (S20W28) was still the brightest region in h-alpha, and
produced occasional C-class events. Some minor surging is occurring
at west limb near where Region 9330 (N22W91) is transiting. At east
limb, more impressive surging was seen to accompany the arrival of
newly numbered Region 9350 (N18E69).
IB. Solar Activity Forecast
Solar activity is expected to be low.
IIA. Geophysical Activity Summary 10-2100Z to 11-2100Z
The geomagnetic field was predominantly quiet to unsettled. However,
brief active conditions occurred from 0600-0900 UTC at Boulder from
a short-lived substorm. An enhancement in the greater than 10 MeV
proton flux at geosynchronous orbit began about 0600 UTC, following
the C6 event at 0123 UTC. The particle increase reached the 1 pfu
level, most recently at 1025 UTC, before the slow decay now
occurring, commenced.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to unsettled. A glancing blow from today's halo
CME is anticipated mid-to-late in the forecast period, but the
impact on the field should be slight. The greater than 10 MeV
proton flux should return to background levels during the next 24
hours.
III. Event Probabilities 12 Feb to 14 Feb
| Class M | 10% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 11 Feb 151 Predicted 12 Feb-14 Feb 150/150/155 90 Day Mean 11 Feb 171
V. Geomagnetic A Indices
Observed Afr/Ap 10 Feb 004/005 Estimated Afr/Ap 11 Feb 007/007 Predicted Afr/Ap 12 Feb-14 Feb 005/005-005/010-010/010
VI. Geomagnetic Activity Probabilities 12 Feb to 14 Feb
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 20% |
| Minor storm | 05% | 05% | 10% |
| Major-severe storm | 01% | 01% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 30% |
| Minor storm | 10% | 10% | 20% |
| Major-severe storm | 01% | 01% | 10% |
All times in UTC
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