Viewing archive of Sunday, 17 December 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 Dec 17 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 351 Issued at 2200Z on 17 Dec 2017IA. Analysis of Solar Active Regions and Activity from 16-2100Z to 17-2100Z Solar activity has been at very low levels for the past 24
hours. There are currently 0 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be very low
on days one, two, and three (18 Dec, 19 Dec, 20 Dec).
IIA. Geophysical Activity Summary 16-2100Z to 17-2100Z
The geomagnetic
field has been at quiet to minor storm levels for the past 24 hours.
Solar wind speed reached a peak of 666 km/s at 17/1531Z. Total IMF
reached 15 nT at 17/1044Z. The maximum southward component of Bz reached
-9 nT at 17/0339Z. Electrons greater than 2 MeV at geosynchronous orbit
reached a peak level of 901 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at unsettled to minor storm levels on days one and two (18 Dec, 19
Dec) and quiet to active levels on day three (20 Dec).
III. Event Probabilities 18 Dec to 20 Dec
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 17 Dec 071 Predicted 18 Dec-20 Dec 072/072/072 90 Day Mean 17 Dec 075
V. Geomagnetic A Indices
Observed Afr/Ap 16 Dec 003/002 Estimated Afr/Ap 17 Dec 019/025 Predicted Afr/Ap 18 Dec-20 Dec 017/022-014/020-013/016
VI. Geomagnetic Activity Probabilities 18 Dec to 20 Dec
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 40% | 35% | 30% |
| Minor storm | 25% | 20% | 15% |
| Major-severe storm | 05% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 15% |
| Minor storm | 25% | 25% | 30% |
| Major-severe storm | 55% | 55% | 45% |
All times in UTC
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