Viewing archive of Saturday, 23 September 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 Sep 23 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 266 Issued at 2200Z on 23 Sep 2017IA. Analysis of Solar Active Regions and Activity from 22-2100Z to 23-2100Z Solar activity has been at very low levels for the past 24
hours. There are currently 1 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 (24 Sep,
25 Sep, 26 Sep).
IIA. Geophysical Activity Summary 22-2100Z to 23-2100Z
The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed
reached a peak of 410 km/s at 23/0904Z. Total IMF reached 5 nT at
23/0052Z. The maximum southward component of Bz reached -4 nT at
23/0343Z. Electrons greater than 2 MeV at geosynchronous orbit reached a
peak level of 2143 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on days one and two (24 Sep, 25 Sep) and
quiet to unsettled levels on day three (26 Sep).
III. Event Probabilities 24 Sep to 26 Sep
| Class M | 15% | 15% | 15% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 23 Sep 081 Predicted 24 Sep-26 Sep 085/090/090 90 Day Mean 23 Sep 081
V. Geomagnetic A Indices
Observed Afr/Ap 22 Sep 005/004 Estimated Afr/Ap 23 Sep 004/005 Predicted Afr/Ap 24 Sep-26 Sep 009/012-014/016-008/008
VI. Geomagnetic Activity Probabilities 24 Sep to 26 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 30% | 15% |
| Minor storm | 10% | 15% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 25% | 25% | 25% |
| Major-severe storm | 40% | 50% | 25% |
All times in UTC
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