Viewing archive of Wednesday, 25 October 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 Oct 25 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 298 Issued at 2200Z on 25 Oct 2017IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z Solar activity has been at very low levels for the past 24
hours. There are currently 2 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be very low
with a slight chance for a C-class flare on days one, two, and three (26
Oct, 27 Oct, 28 Oct).
IIA. Geophysical Activity Summary 24-2100Z to 25-2100Z
The geomagnetic
field has been at quiet to minor storm levels for the past 24 hours.
Solar wind speed reached a peak of 676 km/s at 25/1945Z. Total IMF
reached 10 nT at 25/0157Z. The maximum southward component of Bz reached
-8 nT at 25/0206Z. Electrons greater than 2 MeV at geosynchronous orbit
reached a peak level of 1178 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to minor storm levels on day one (26 Oct) and quiet to
active levels on days two and three (27 Oct, 28 Oct).
III. Event Probabilities 26 Oct to 28 Oct
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 25 Oct 079 Predicted 26 Oct-28 Oct 079/078/077 90 Day Mean 25 Oct 082
V. Geomagnetic A Indices
Observed Afr/Ap 24 Oct 013/014 Estimated Afr/Ap 25 Oct 022/028 Predicted Afr/Ap 26 Oct-28 Oct 019/024-013/016-010/012
VI. Geomagnetic Activity Probabilities 26 Oct to 28 Oct
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 40% | 30% | 25% |
| Minor storm | 25% | 15% | 10% |
| Major-severe storm | 05% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 20% |
| Minor storm | 30% | 25% | 20% |
| Major-severe storm | 45% | 35% | 20% |
All times in UTC
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