Viewing archive of Saturday, 9 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 09 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 252 Issued at 2200Z on 09 Sep 2017IA. Analysis of Solar Active Regions and Activity from 08-2100Z to 09-2100Z Solar activity has been at moderate levels for the past 24
hours. The largest solar event of the period was a M3 event observed at
09/1104Z from Region 2673 (S09W83). There are currently 3 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be moderate
with a chance for X-class flares on day one (10 Sep) and expected to be
low with a chance for M-class flares on day two (11 Sep) and expected to
be very low with a slight chance for a C-class flare on day three (12
Sep).
IIA. Geophysical Activity Summary 08-2100Z to 09-2100Z
The geomagnetic
field has been at quiet to minor storm levels for the past 24 hours.
Solar wind speed reached a peak of 847 km/s at 08/2150Z. Total IMF
reached 6 nT at 08/2201Z. The maximum southward component of Bz reached
-3 nT at 08/2105Z. Protons greater than 10 MeV at geosynchronous orbit
reached a peak level of 14 pfu at 08/2100Z. Electrons greater than 2 MeV
at geosynchronous orbit reached a peak level of 6358 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet levels on days one and three (10 Sep, 12 Sep) and quiet
to unsettled levels on day two (11 Sep). Protons greater than 10 Mev
have a chance of crossing threshold on day one (10 Sep) and have a
slight chance of crossing threshold on day two (11 Sep).
III. Event Probabilities 10 Sep to 12 Sep
| Class M | 70% | 25% | 01% |
| Class X | 35% | 05% | 01% |
| Proton | 25% | 15% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 09 Sep 107 Predicted 10 Sep-12 Sep 095/085/083 90 Day Mean 09 Sep 081
V. Geomagnetic A Indices
Observed Afr/Ap 08 Sep 050/117 Estimated Afr/Ap 09 Sep 007/007 Predicted Afr/Ap 10 Sep-12 Sep 007/008-007/008-006/005
VI. Geomagnetic Activity Probabilities 10 Sep to 12 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 15% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 20% | 20% | 20% |
| Major-severe storm | 20% | 20% | 15% |
All times in UTC
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