Viewing archive of Friday, 4 September 2015
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 2015 Sep 04 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 247 Issued at 2200Z on 04 Sep 2015IA. Analysis of Solar Active Regions and Activity from 03-2100Z to 04-2100Z Solar activity has been at very low levels for the past 24
hours. There are currently 3 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 (05
Sep, 06 Sep, 07 Sep).
IIA. Geophysical Activity Summary 03-2100Z to 04-2100Z
The geomagnetic
field has been at quiet to minor storm levels for the past 24 hours.
Solar wind speed, as measured by the ACE spacecraft, reached a peak
speed of 585 km/s at 04/0527Z. Total IMF reached 14 nT at 04/1145Z. The
maximum southward component of Bz reached -10 nT at 04/1206Z. Electrons
greater than 2 MeV at geosynchronous orbit reached a peak level of 371
pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on days one and three (05 Sep, 07 Sep)
and quiet to unsettled levels on day two (06 Sep).
III. Event Probabilities 05 Sep to 07 Sep
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 04 Sep 090 Predicted 05 Sep-07 Sep 090/090/090 90 Day Mean 04 Sep 111
V. Geomagnetic A Indices
Observed Afr/Ap 03 Sep 009/008 Estimated Afr/Ap 04 Sep 017/020 Predicted Afr/Ap 05 Sep-07 Sep 010/012-008/008-013/015
VI. Geomagnetic Activity Probabilities 05 Sep to 07 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 15% | 35% |
| Minor storm | 10% | 05% | 15% |
| Major-severe storm | 01% | 01% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 10% |
| Minor storm | 30% | 25% | 30% |
| Major-severe storm | 40% | 25% | 50% |
All times in UTC
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