Viewing archive of Tuesday, 11 September 2018
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 2018 Sep 11 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 254 Issued at 2200Z on 11 Sep 2018IA. Analysis of Solar Active Regions and Activity from 10-2100Z to 11-2100Z 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 and two (12 Sep, 13
Sep) and expected to be very low on day three (14 Sep).
IIA. Geophysical Activity Summary 10-2100Z to 11-2100Z
The geomagnetic
field has been at unsettled to major storm levels for the past 24 hours.
Solar wind speed reached a peak of 623 km/s at 11/1825Z. Total IMF
reached 15 nT at 10/2142Z. The maximum southward component of Bz reached
-13 nT at 10/2135Z. Electrons greater than 2 MeV at geosynchronous orbit
reached a peak level of 366 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to minor storm levels on day one (12 Sep) and quiet to
active levels on days two and three (13 Sep, 14 Sep).
III. Event Probabilities 12 Sep to 14 Sep
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 11 Sep 069 Predicted 12 Sep-14 Sep 070/070/069 90 Day Mean 11 Sep 070
V. Geomagnetic A Indices
Observed Afr/Ap 10 Sep 015/016 Estimated Afr/Ap 11 Sep 028/043 Predicted Afr/Ap 12 Sep-14 Sep 012/016-011/012-010/012
VI. Geomagnetic Activity Probabilities 12 Sep to 14 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 30% | 30% |
| Minor storm | 25% | 20% | 15% |
| Major-severe storm | 10% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 25% | 25% | 25% |
| Major-severe storm | 60% | 55% | 45% |
All times in UTC
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