Viewing archive of Sunday, 26 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 26 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 116 Issued at 2200Z on 26 Apr 2015IA. Analysis of Solar Active Regions and Activity from 25-2100Z to 26-2100Z Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C1 event observed at
26/1149Z from Region 2331 (S10W59). There are currently 4 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be low on days
one, two, and three (27 Apr, 28 Apr, 29 Apr).
IIA. Geophysical Activity Summary 25-2100Z to 26-2100Z
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 330 km/s at
25/2211Z. Electrons greater than 2 MeV at geosynchronous orbit reached a
peak level of 1343 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet levels on days one and two (27 Apr, 28 Apr) and quiet to
unsettled levels on day three (29 Apr).
III. Event Probabilities 27 Apr to 29 Apr
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 26 Apr 119 Predicted 27 Apr-29 Apr 120/120/115 90 Day Mean 26 Apr 131
V. Geomagnetic A Indices
Observed Afr/Ap 25 Apr 002/002 Estimated Afr/Ap 26 Apr 004/004 Predicted Afr/Ap 27 Apr-29 Apr 006/005-006/005-007/008
VI. Geomagnetic Activity Probabilities 27 Apr to 29 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 15% |
| Minor storm | 01% | 01% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 15% |
| Minor storm | 20% | 20% | 25% |
| Major-severe storm | 10% | 10% | 20% |
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