Viewing archive of Friday, 15 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 15 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 258 Issued at 2200Z on 15 Sep 2017IA. Analysis of Solar Active Regions and Activity from 14-2100Z to 15-2100Z 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
on days one, two, and three (16 Sep, 17 Sep, 18 Sep).
IIA. Geophysical Activity Summary 14-2100Z to 15-2100Z
The geomagnetic
field has been at unsettled to major storm levels for the past 24 hours.
Solar wind speed reached a peak of 776 km/s at 15/0629Z. Total IMF
reached 7 nT at 15/1725Z. The maximum southward component of Bz reached
-6 nT at 15/1826Z. Protons greater than 10 MeV at geosynchronous orbit
reached a peak level of 6 pfu at 14/2105Z. Electrons greater than 2 MeV
at geosynchronous orbit reached a peak level of 32096 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at unsettled to minor storm levels on day one (16 Sep) and quiet
to active levels on days two and three (17 Sep, 18 Sep).
III. Event Probabilities 16 Sep to 18 Sep
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 15 Sep 073 Predicted 16 Sep-18 Sep 073/073/075 90 Day Mean 15 Sep 081
V. Geomagnetic A Indices
Observed Afr/Ap 14 Sep 019/027 Estimated Afr/Ap 15 Sep 025/035 Predicted Afr/Ap 16 Sep-18 Sep 019/025-014/015-012/015
VI. Geomagnetic Activity Probabilities 16 Sep to 18 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 30% | 30% |
| Minor storm | 25% | 10% | 10% |
| Major-severe storm | 05% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 15% | 15% |
| Minor storm | 25% | 25% | 25% |
| Major-severe storm | 60% | 40% | 40% |
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