Viewing archive of Monday, 27 April 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 Apr 27 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 117 Issued at 2200Z on 27 Apr 2015IA. Analysis of Solar Active Regions and Activity from 26-2100Z to 27-2100Z Solar activity has been at very low levels for the past 24
hours. There are currently 3 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be low on days
one, two, and three (28 Apr, 29 Apr, 30 Apr).
IIA. Geophysical Activity Summary 26-2100Z to 27-2100Z
The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed,
as measured by the ACE spacecraft, reached a peak speed of 370 km/s at
27/1644Z. Total IMF reached 7 nT at 27/1131Z. The maximum southward
component of Bz reached -6 nT at 27/0935Z. Electrons greater than 2 MeV
at geosynchronous orbit reached a peak level of 874 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet levels on day one (28 Apr) and quiet to unsettled levels
on days two and three (29 Apr, 30 Apr).
III. Event Probabilities 28 Apr to 30 Apr
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 27 Apr 108 Predicted 28 Apr-30 Apr 110/105/105 90 Day Mean 27 Apr 130
V. Geomagnetic A Indices
Observed Afr/Ap 26 Apr 003/002 Estimated Afr/Ap 27 Apr 005/005 Predicted Afr/Ap 28 Apr-30 Apr 006/005-007/008-007/010
VI. Geomagnetic Activity Probabilities 28 Apr to 30 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 15% | 20% |
| Minor storm | 01% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 15% | 15% |
| Minor storm | 20% | 25% | 30% |
| Major-severe storm | 10% | 20% | 25% |
All times in UTC
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