Viewing archive of Sunday, 18 October 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 Oct 18 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 291 Issued at 2200Z on 18 Oct 2015IA. Analysis of Solar Active Regions and Activity from 17-2100Z to 18-2100Z 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
17/2335Z from Region 2437 (S19E74). There are currently 5 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be moderate on
days one, two, and three (19 Oct, 20 Oct, 21 Oct).
IIA. Geophysical Activity Summary 17-2100Z to 18-2100Z
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 490 km/s at 18/1804Z. Total IMF reached 12 nT at 18/0656Z. The
maximum southward component of Bz reached -11 nT at 18/0758Z. Electrons
greater than 2 MeV at geosynchronous orbit reached a peak level of 770
pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on days one and three (19 Oct, 21 Oct)
and quiet to unsettled levels on day two (20 Oct).
III. Event Probabilities 19 Oct to 21 Oct
| Class M | 55% | 55% | 55% |
| Class X | 05% | 05% | 05% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 18 Oct 120 Predicted 19 Oct-21 Oct 125/125/125 90 Day Mean 18 Oct 102
V. Geomagnetic A Indices
Observed Afr/Ap 17 Oct 009/008 Estimated Afr/Ap 18 Oct 020/024 Predicted Afr/Ap 19 Oct-21 Oct 010/012-007/008-009/012
VI. Geomagnetic Activity Probabilities 19 Oct to 21 Oct
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 15% | 25% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 15% | 20% |
| Minor storm | 30% | 20% | 30% |
| Major-severe storm | 30% | 20% | 30% |
All times in UTC
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