Viewing archive of Sunday, 10 September 2017
Solar activity report
Report of Solar-Geophysical Activity 2017 Sep 10 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 253 Issued at 2200Z on 10 Sep 2017IA. Analysis of Solar Active Regions and Activity from 09-2100Z to 10-2100Z
Solar activity has been at high levels for the past 24 hours.
The largest solar event of the period was a X8 event observed at
10/1606Z from old Region 2673 (S09, L=119). There are currently 3
numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be moderate
with a chance for X-class flares on day one (11 Sep) and expected to be
very low with a chance for a C-class flares and a slight chance for an
M-class flare on day two (12 Sep) and expected to be very low with a
slight chance for a C-class flare on day three (13 Sep).
IIA. Geophysical Activity Summary 09-2100Z to 10-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 560 km/s at 10/1015Z. Total IMF reached 6
nT at 10/1935Z. The maximum southward component of Bz reached -4 nT at
10/2020Z. Protons greater than 10 MeV at geosynchronous orbit reached a
peak level of 1038 pfu at 10/1845Z. Protons greater than 100 MeV at
geosynchronous orbit reached a peak level of 54 pfu at 10/2100Z.
Electrons greater than 2 MeV at geosynchronous orbit reached a peak
level of 7875 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on day one (11 Sep), quiet to active
levels on day two (12 Sep) and unsettled to minor storm levels on day
three (13 Sep). Protons are expected to cross threshold on day one (11
Sep), are expected to cross threshold on day two (12 Sep) and are likely
to cross threshold on day three (13 Sep).
III. Event Probabilities 11 Sep to 13 Sep
| Class M | 80% | 10% | 01% |
| Class X | 50% | 01% | 01% |
| Proton | 99% | 95% | 65% |
| PCAF | red | ||
IV. Penticton 10.7 cm Flux
Observed 10 Sep 100 Predicted 11 Sep-13 Sep 085/083/081 90 Day Mean 10 Sep 081
V. Geomagnetic A Indices
Observed Afr/Ap 09 Sep 006/004 Estimated Afr/Ap 10 Sep 005/006 Predicted Afr/Ap 11 Sep-13 Sep 007/007-010/012-020/030
VI. Geomagnetic Activity Probabilities 11 Sep to 13 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 25% | 35% |
| Minor storm | 05% | 10% | 25% |
| Major-severe storm | 01% | 01% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 10% |
| Minor storm | 20% | 30% | 25% |
| Major-severe storm | 20% | 40% | 60% |
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Space weather facts
| Last X-flare: | 2017/09/10 | X8.2 |
| Last M-flare: | 2017/10/20 | M1.0 |
| Last geomagnetic storm: | 2019/10/26 | Kp5 (G1) |
| Number of spotless days in 2019: | 266 | |
| Current stretch spotless days: | 39 | |