Viewing archive of Tuesday, 25 August 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 Aug 25 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 237 Issued at 2200Z on 25 Aug 2015IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C4 event observed at
25/0631Z from Region 2403 (S15W31). There are currently 2 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 and two (26 Aug,
27 Aug) and expected to be low with a chance for M-class flares on day
three (28 Aug).
IIA. Geophysical Activity Summary 24-2100Z to 25-2100Z
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
461 km/s at 25/0113Z. Total IMF reached 6 nT at 25/1707Z. The maximum
southward component of Bz reached -5 nT at 25/1749Z. Electrons greater
than 2 MeV at geosynchronous orbit reached a peak level of 1837 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on day one (26 Aug), quiet to active
levels on day two (27 Aug) and unsettled to active levels on day three
(28 Aug). Protons greater than 10 Mev have a slight chance of crossing
threshold on days one and two (26 Aug, 27 Aug).
III. Event Probabilities 26 Aug to 28 Aug
| Class M | 60% | 55% | 50% |
| Class X | 10% | 10% | 05% |
| Proton | 10% | 10% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 25 Aug 121 Predicted 26 Aug-28 Aug 120/125/125 90 Day Mean 25 Aug 112
V. Geomagnetic A Indices
Observed Afr/Ap 24 Aug 007/008 Estimated Afr/Ap 25 Aug 008/009 Predicted Afr/Ap 26 Aug-28 Aug 007/006-009/012-014/018
VI. Geomagnetic Activity Probabilities 26 Aug to 28 Aug
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 30% | 35% |
| Minor storm | 05% | 15% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 25% | 30% | 30% |
| Major-severe storm | 25% | 45% | 45% |
All times in UTC
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