Viewing archive of Thursday, 4 September 2014
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 2014 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 2014IA. Analysis of Solar Active Regions and Activity from 03-2100Z to 04-2100Z Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C6 event observed at
04/1330Z from Region 2152 (S15W38). There are currently 8 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be moderate
with a slight chance for an X-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 unsettled levels for the past 24 hours. Solar
wind speed, as measured by the ACE spacecraft, reached a peak speed of
443 km/s at 03/2346Z. Total IMF reached 5 nT at 04/0221Z. The maximum
southward component of Bz reached -5 nT at 04/0210Z. Protons greater
than 10 MeV at geosynchronous orbit reached a peak level of 5 pfu at
04/1425Z. Electrons greater than 2 MeV at geosynchronous orbit reached a
peak level of 2420 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on day one (05 Sep), unsettled to
active levels on day two (06 Sep) and quiet to active levels on day
three (07 Sep).
III. Event Probabilities 05 Sep to 07 Sep
| Class M | 55% | 55% | 55% |
| Class X | 10% | 10% | 10% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 04 Sep 146 Predicted 05 Sep-07 Sep 150/155/155 90 Day Mean 04 Sep 130
V. Geomagnetic A Indices
Observed Afr/Ap 03 Sep 011/011 Estimated Afr/Ap 04 Sep 009/009 Predicted Afr/Ap 05 Sep-07 Sep 007/010-015/020-012/015
VI. Geomagnetic Activity Probabilities 05 Sep to 07 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 35% | 25% |
| Minor storm | 05% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 20% | 20% | 20% |
| Major-severe storm | 25% | 20% | 25% |
All times in UTC
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