Viewing archive of Saturday, 26 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 26 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 269 Issued at 2200Z on 26 Sep 2015IA. Analysis of Solar Active Regions and Activity from 25-2100Z to 26-2100Z 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
26/0129Z from Region 2422 (S20W03). There are currently 7 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be low with
a chance for M-class flares on days one, two, and three (27 Sep, 28 Sep,
29 Sep).
IIA. Geophysical Activity Summary 25-2100Z to 26-2100Z
The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed,
as measured by the ACE spacecraft, reached a peak speed of 514 km/s at
26/0032Z. Total IMF reached 6 nT at 25/2347Z. The maximum southward
component of Bz reached -3 nT at 26/1553Z. Electrons greater than 2 MeV
at geosynchronous orbit reached a peak level of 976 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on days one, two, and three (27 Sep,
28 Sep, 29 Sep).
III. Event Probabilities 27 Sep to 29 Sep
| Class M | 40% | 40% | 40% |
| Class X | 05% | 05% | 05% |
| Proton | 01% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 26 Sep 120 Predicted 27 Sep-29 Sep 120/120/115 90 Day Mean 26 Sep 104
V. Geomagnetic A Indices
Observed Afr/Ap 25 Sep 006/009 Estimated Afr/Ap 26 Sep 004/006 Predicted Afr/Ap 27 Sep-29 Sep 007/008-007/008-007/008
VI. Geomagnetic Activity Probabilities 27 Sep to 29 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 20% |
| Minor storm | 25% | 25% | 25% |
| Major-severe storm | 20% | 20% | 20% |
All times in UTC
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