Viewing archive of Friday, 28 December 2018
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 2018 Dec 28 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 362 Issued at 2200Z on 28 Dec 2018IA. Analysis of Solar Active Regions and Activity from 27-2100Z to 28-2100Z 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 (29 Dec, 30 Dec, 31 Dec).
IIA. Geophysical Activity Summary 27-2100Z to 28-2100Z
The geomagnetic
field has been at unsettled to minor storm levels for the past 24 hours.
Solar wind speed reached a peak of 645 km/s at 28/1959Z. Total IMF
reached 13 nT at 28/0508Z. The maximum southward component of Bz reached
-11 nT at 28/0606Z.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on day one (29 Dec) and quiet to
unsettled levels on days two and three (30 Dec, 31 Dec).
III. Event Probabilities 29 Dec to 31 Dec
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 28 Dec 069 Predicted 29 Dec-31 Dec 069/069/069 90 Day Mean 28 Dec 070
V. Geomagnetic A Indices
Observed Afr/Ap 27 Dec 005/003 Estimated Afr/Ap 28 Dec 020/024 Predicted Afr/Ap 29 Dec-31 Dec 015/015-010/010-008/008
VI. Geomagnetic Activity Probabilities 29 Dec to 31 Dec
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 15% | 10% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 25% | 30% | 25% |
| Major-severe storm | 40% | 25% | 20% |
All times in UTC
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