Viewing archive of Thursday, 17 April 2014
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 2014 Apr 17 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 107 Issued at 2200Z on 17 Apr 2014IA. Analysis of Solar Active Regions and Activity from 16-2100Z to 17-2100Z Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C3 event observed at
17/1154Z. There are currently 12 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, two, and three
(18 Apr, 19 Apr, 20 Apr).
IIA. Geophysical Activity Summary 16-2100Z to 17-2100Z
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
448 km/s at 17/1854Z. Total IMF reached 10 nT at 17/0528Z. The maximum
southward component of Bz reached -8 nT at 17/1322Z. Electrons greater
than 2 MeV at geosynchronous orbit reached a peak level of 279 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on day one (18 Apr), quiet to active
levels on day two (19 Apr) and quiet to minor storm levels on day three
(20 Apr). Protons have a slight chance of crossing threshold on days
one, two, and three (18 Apr, 19 Apr, 20 Apr).
III. Event Probabilities 18 Apr to 20 Apr
| Class M | 60% | 60% | 60% |
| Class X | 10% | 10% | 10% |
| Proton | 10% | 10% | 10% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 17 Apr 179 Predicted 18 Apr-20 Apr 180/180/180 90 Day Mean 17 Apr 155
V. Geomagnetic A Indices
Observed Afr/Ap 16 Apr 005/004 Estimated Afr/Ap 17 Apr 007/008 Predicted Afr/Ap 18 Apr-20 Apr 008/008-009/012-015/020
VI. Geomagnetic Activity Probabilities 18 Apr to 20 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 40% | 40% |
| Minor storm | 05% | 15% | 25% |
| Major-severe storm | 01% | 01% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 10% | 10% |
| Minor storm | 25% | 25% | 25% |
| Major-severe storm | 25% | 55% | 60% |
All times in UTC
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