Viewing archive of Saturday, 25 May 2013
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 2013 May 25 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 145 Issued at 2200Z on 25 May 2013IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C2 event observed at
25/1049Z from Region 1755 (N11E12). There are currently 6 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be low with
a chance for M-class flares on days one, two, and three (26 May, 27 May,
28 May).
IIA. Geophysical Activity Summary 24-2100Z to 25-2100Z
The geomagnetic
field has been at unsettled to minor storm levels for the past 24 hours.
Solar wind speed, as measured by the ACE spacecraft, reached a peak
speed of 725 km/s at 25/2100Z. Total IMF reached 13 nT at 25/2040Z. The
maximum southward component of Bz reached -11 nT at 25/2048Z. Protons
greater than 10 MeV at geosynchronous orbit reached a peak level of 16
pfu at 24/2110Z. Electrons greater than 2 MeV at geosynchronous orbit
reached a peak level of 943 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to minor storm levels on day one (26 May) and quiet to
unsettled levels on days two and three (27 May, 28 May).
III. Event Probabilities 26 May to 28 May
| Class M | 25% | 25% | 25% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 25 May 121 Predicted 26 May-28 May 120/120/125 90 Day Mean 25 May 123
V. Geomagnetic A Indices
Observed Afr/Ap 24 May 017/023 Estimated Afr/Ap 25 May 020/029 Predicted Afr/Ap 26 May-28 May 015/020-010/010-007/008
VI. Geomagnetic Activity Probabilities 26 May to 28 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 20% | 10% |
| Minor storm | 15% | 05% | 01% |
| Major-severe storm | 05% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 30% | 25% | 20% |
| Major-severe storm | 50% | 25% | 20% |
All times in UTC
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