Viewing archive of Wednesday, 13 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 13 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 256 Issued at 2200Z on 13 Sep 2017IA. Analysis of Solar Active Regions and Activity from 12-2100Z to 13-2100Z 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 expected to be very low
with a slight chance for a C-class flare on days one, two, and three (14
Sep, 15 Sep, 16 Sep).
IIA. Geophysical Activity Summary 12-2100Z to 13-2100Z
The geomagnetic
field has been at quiet to minor storm levels for the past 24 hours.
Solar wind speed reached a peak of 656 km/s at 12/2116Z. Total IMF
reached 16 nT at 12/2129Z. The maximum southward component of Bz reached
-12 nT at 12/2257Z. Protons greater than 10 MeV at geosynchronous orbit
reached a peak level of 138 pfu at 12/2100Z. Electrons greater than 2
MeV at geosynchronous orbit reached a peak level of 2410 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at unsettled to minor storm levels on days one and two (14 Sep, 15
Sep) and unsettled to active levels on day three (16 Sep). Protons are
expected to cross threshold on day one (14 Sep), are expected to cross
threshold on day two (15 Sep) and are likely to cross threshold on day
three (16 Sep).
III. Event Probabilities 14 Sep to 16 Sep
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 95% | 80% | 60% |
| PCAF | red | ||
IV. Penticton 10.7 cm Flux
Observed 13 Sep 075 Predicted 14 Sep-16 Sep 075/075/075 90 Day Mean 13 Sep 081
V. Geomagnetic A Indices
Observed Afr/Ap 12 Sep 016/016 Estimated Afr/Ap 13 Sep 021/028 Predicted Afr/Ap 14 Sep-16 Sep 021/028-020/026-018/020
VI. Geomagnetic Activity Probabilities 14 Sep to 16 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 35% | 30% |
| Minor storm | 30% | 25% | 15% |
| Major-severe storm | 15% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 05% | 10% | 10% |
| Minor storm | 20% | 20% | 25% |
| Major-severe storm | 65% | 60% | 50% |
All times in UTC
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