Viewing archive of Monday, 18 September 2006
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 2006 Sep 18 2204 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 261 Issued at 2200Z on 18 Sep 2006IA. Analysis of Solar Active Regions and Activity from 17-2100Z to 18-2100Z Solar activity was low. Newly numbered Region 910
(S08E49) produced a C1 flare at 18/1945Z.
IB. Solar Activity Forecast
Solar activity is expected to be very
low.
IIA. Geophysical Activity Summary 17-2100Z to 18-2100Z
The geomagnetic field has been at quiet to minor storm levels. Two
minor storm periods from 18/0000Z - 18/0600Z were likely the result
of elevated solar wind speed from the coronal hole high speed
stream. Solar wind speed remains elevated at time of issue at
approximately 650 km/s. The greater than 2 MeV electron flux
reached high levels today.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to unsettled with a chance for active periods
on 19 September as the coronal hole rotates out of a geoeffective
position. Expect mostly quiet conditions on 20 - 21 September.
III. Event Probabilities 19 Sep to 21 Sep
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 18 Sep 074 Predicted 19 Sep-21 Sep 075/075/075 90 Day Mean 18 Sep 077
V. Geomagnetic A Indices
Observed Afr/Ap 17 Sep 009/016 Estimated Afr/Ap 18 Sep 018/020 Predicted Afr/Ap 19 Sep-21 Sep 010/012-005/008-005/005
VI. Geomagnetic Activity Probabilities 19 Sep to 21 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 15% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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