Viewing archive of Friday, 19 September 2014
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 2014 Sep 19 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 262 Issued at 2200Z on 19 Sep 2014IA. 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
19/1832Z from Region 2171 (S09E65). There are currently 7 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 Sep,
21 Sep, 22 Sep).
IIA. Geophysical Activity Summary 18-2100Z to 19-2100Z
The geomagnetic
field has been at unsettled to minor storm levels for the past 24 hours.
Solar wind speed, as measured by the ACE spacecraft, reached a peak
speed of 559 km/s at 19/1850Z. Total IMF reached 17 nT at 19/0805Z. The
maximum southward component of Bz reached -13 nT at 19/1530Z.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at unsettled to active levels on day one (20 Sep), quiet to
unsettled levels on day two (21 Sep) and quiet levels on day three (22
Sep).
III. Event Probabilities 20 Sep to 22 Sep
| Class M | 20% | 20% | 20% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 19 Sep 122 Predicted 20 Sep-22 Sep 120/115/115 90 Day Mean 19 Sep 131
V. Geomagnetic A Indices
Observed Afr/Ap 18 Sep 007/007 Estimated Afr/Ap 19 Sep 018/024 Predicted Afr/Ap 20 Sep-22 Sep 015/018-008/008-006/005
VI. Geomagnetic Activity Probabilities 20 Sep to 22 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 15% | 10% |
| Minor storm | 15% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 30% | 20% | 15% |
| Major-severe storm | 50% | 20% | 15% |
All times in UTC
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