Viewing archive of Saturday, 19 December 2015
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 2015 Dec 19 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 353 Issued at 2200Z on 19 Dec 2015IA. Analysis of Solar Active Regions and Activity from 18-2100Z to 19-2100Z Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C3 event observed at
19/0204Z from Region 2468 (S15W54). There are currently 3 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be low with a
slight chance for an M-class flare on days one, two, and three (20 Dec,
21 Dec, 22 Dec).
IIA. Geophysical Activity Summary 18-2100Z to 19-2100Z
The geomagnetic
field has been at quiet to active levels for the past 24 hours. Solar
wind speed, as measured by the ACE spacecraft, reached a peak speed of
530 km/s at 19/1945Z. Total IMF reached 17 nT at 19/1549Z. The maximum
southward component of Bz reached -14 nT at 19/1536Z. Electrons greater
than 2 MeV at geosynchronous orbit reached a peak level of 2825 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to minor storm levels on day one (20 Dec), quiet to
unsettled levels on day two (21 Dec) and quiet levels on day three (22
Dec).
III. Event Probabilities 20 Dec to 22 Dec
| Class M | 15% | 15% | 15% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 19 Dec 119 Predicted 20 Dec-22 Dec 120/125/125 90 Day Mean 19 Dec 109
V. Geomagnetic A Indices
Observed Afr/Ap 18 Dec 004/003 Estimated Afr/Ap 19 Dec 010/013 Predicted Afr/Ap 20 Dec-22 Dec 015/018-007/008-006/005
VI. Geomagnetic Activity Probabilities 20 Dec to 22 Dec
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 40% | 10% | 10% |
| Minor storm | 20% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 05% | 20% | 15% |
| Minor storm | 25% | 25% | 20% |
| Major-severe storm | 50% | 15% | 10% |
All times in UTC
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