Viewing archive of Tuesday, 15 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 15 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 258 Issued at 2200Z on 15 Sep 2015IA. Analysis of Solar Active Regions and Activity from 14-2100Z to 15-2100Z Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C1 event observed at
15/0519Z from Region 2415 (S22E14). There are currently 4 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be very low
with a chance for a C-class flares on days one, two, and three (16 Sep,
17 Sep, 18 Sep).
IIA. Geophysical Activity Summary 14-2100Z to 15-2100Z
The geomagnetic
field has been at unsettled to active levels for the past 24 hours.
Solar wind speed, as measured by the ACE spacecraft, reached a peak
speed of 567 km/s at 15/1324Z. Total IMF reached 8 nT at 15/0427Z. The
maximum southward component of Bz reached -5 nT at 15/0738Z. Electrons
greater than 2 MeV at geosynchronous orbit reached a peak level of 6437
pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on day one (16 Sep) and quiet to
unsettled levels on days two and three (17 Sep, 18 Sep).
III. Event Probabilities 16 Sep to 18 Sep
| Class M | 05% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 15 Sep 101 Predicted 16 Sep-18 Sep 100/100/095 90 Day Mean 15 Sep 105
V. Geomagnetic A Indices
Observed Afr/Ap 14 Sep 010/016 Estimated Afr/Ap 15 Sep 014/018 Predicted Afr/Ap 16 Sep-18 Sep 009/012-008/008-008/008
VI. Geomagnetic Activity Probabilities 16 Sep to 18 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 20% | 20% |
| Minor storm | 15% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 20% | 20% |
| Minor storm | 25% | 30% | 30% |
| Major-severe storm | 40% | 25% | 25% |
All times in UTC
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