Viewing archive of Sunday, 27 August 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 Aug 27 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 239 Issued at 2200Z on 27 Aug 2017IA. Analysis of Solar Active Regions and Activity from 26-2100Z to 27-2100Z Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C6 event observed at
27/1516Z from Region 2671 (N13W93). 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 and a slight chance for an M-class
flare on days one, two, and three (28 Aug, 29 Aug, 30 Aug).
IIA. Geophysical Activity Summary 26-2100Z to 27-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 399 km/s at 27/0705Z. Total IMF reached 9
nT at 27/1621Z. The maximum southward component of Bz reached -9 nT at
27/1645Z. Electrons greater than 2 MeV at geosynchronous orbit reached a
peak level of 8019 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on days one and three (28 Aug, 30 Aug)
and quiet to unsettled levels on day two (29 Aug).
III. Event Probabilities 28 Aug to 30 Aug
| Class M | 10% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 27 Aug 078 Predicted 28 Aug-30 Aug 078/078/078 90 Day Mean 27 Aug 076
V. Geomagnetic A Indices
Observed Afr/Ap 26 Aug 005/004 Estimated Afr/Ap 27 Aug 009/011 Predicted Afr/Ap 28 Aug-30 Aug 009/008-007/008-012/015
VI. Geomagnetic Activity Probabilities 28 Aug to 30 Aug
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 30% |
| Minor storm | 01% | 05% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 15% | 15% | 20% |
| Major-severe storm | 15% | 15% | 20% |
All times in UTC
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