Viewing archive of Saturday, 29 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 29 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 241 Issued at 2200Z on 29 Aug 2015IA. Analysis of Solar Active Regions and Activity from 28-2100Z to 29-2100Z 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
28/2347Z from Region 2403 (S15W82). There are currently 3 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 day one (30 Aug) and
expected to be low with a chance for M-class flares on day two (31 Aug)
and expected to be very low with a chance for a C-class flares on day
three (01 Sep).
IIA. Geophysical Activity Summary 28-2100Z to 29-2100Z
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 512 km/s at 29/0712Z. Total IMF reached 12 nT at 28/2119Z. The
maximum southward component of Bz reached -10 nT at 28/2119Z. Electrons
greater than 2 MeV at geosynchronous orbit reached a peak level of 684
pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on days one and two (30 Aug, 31 Aug)
and quiet to minor storm levels on day three (01 Sep). Protons greater
than 10 Mev have a slight chance of crossing threshold on day one (30
Aug).
III. Event Probabilities 30 Aug to 01 Sep
| Class M | 55% | 40% | 05% |
| Class X | 10% | 05% | 01% |
| Proton | 10% | 05% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 29 Aug 100 Predicted 30 Aug-01 Sep 100/095/095 90 Day Mean 29 Aug 113
V. Geomagnetic A Indices
Observed Afr/Ap 28 Aug 028/045 Estimated Afr/Ap 29 Aug 013/017 Predicted Afr/Ap 30 Aug-01 Sep 009/010-009/008-014/020
VI. Geomagnetic Activity Probabilities 30 Aug to 01 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 15% | 45% |
| Minor storm | 05% | 01% | 25% |
| Major-severe storm | 01% | 01% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 10% |
| Minor storm | 25% | 25% | 25% |
| Major-severe storm | 30% | 20% | 70% |
All times in UTC
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