Viewing archive of Thursday, 23 February 2017
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 2017 Feb 23 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 54 Issued at 2200Z on 23 Feb 2017IA. Analysis of Solar Active Regions and Activity from 22-2100Z to 23-2100Z
Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C1 event observed at
23/2053Z from Region 2638 (N18E20). There are currently 1 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be very low
with a chance for a C-class flares on days one, two, and three (24 Feb,
25 Feb, 26 Feb).
IIA. Geophysical Activity Summary 22-2100Z to 23-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 650 km/s at 23/2048Z. Total IMF reached 12
nT at 23/1556Z. The maximum southward component of Bz reached -8 nT at
23/1931Z. Electrons greater than 2 MeV at geosynchronous orbit reached a
peak level of 642 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to minor storm levels on day one (24 Feb), quiet to
active levels on day two (25 Feb) and quiet to unsettled levels on day
three (26 Feb).
III. Event Probabilities 24 Feb to 26 Feb
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 23 Feb 083 Predicted 24 Feb-26 Feb 083/083/083 90 Day Mean 23 Feb 077
V. Geomagnetic A Indices
Observed Afr/Ap 22 Feb 008/010 Estimated Afr/Ap 23 Feb 011/014 Predicted Afr/Ap 24 Feb-26 Feb 014/018-011/012-008/008
VI. Geomagnetic Activity Probabilities 24 Feb to 26 Feb
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 25% | 15% |
| Minor storm | 20% | 10% | 05% |
| Major-severe storm | 05% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 15% | 15% |
| Minor storm | 20% | 30% | 25% |
| Major-severe storm | 50% | 40% | 20% |
All times in UTC
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