Viewing archive of Sunday, 26 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 26 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 146 Issued at 2200Z on 26 May 2013IA. 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 C3 event observed at
26/0957Z from Region 1756 (S20W13). There are currently 5 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 (27 May, 28 May,
29 May).
IIA. Geophysical Activity Summary 25-2100Z to 26-2100Z
The geomagnetic
field has been at quiet to minor storm levels for the past 24 hours.
Solar wind speed, as measured by the ACE spacecraft, reached a peak
speed of 849 km/s at 25/2207Z. Total IMF reached 13 nT at 25/2258Z. The
maximum southward component of Bz reached -5 nT at 26/0615Z. Protons
greater than 10 MeV at geosynchronous orbit reached a peak level of 2
pfu at 25/2115Z. Electrons greater than 2 MeV at geosynchronous orbit
reached a peak level of 11636 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on days one and two (27 May, 28 May)
and quiet levels on day three (29 May).
III. Event Probabilities 27 May to 29 May
| Class M | 25% | 25% | 25% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 26 May 120 Predicted 27 May-29 May 120/120/120 90 Day Mean 26 May 123
V. Geomagnetic A Indices
Observed Afr/Ap 25 May 025/040 Estimated Afr/Ap 26 May 016/018 Predicted Afr/Ap 27 May-29 May 010/010-007/008-006/005
VI. Geomagnetic Activity Probabilities 27 May to 29 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 10% | 10% |
| Minor storm | 05% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 25% | 20% | 20% |
| Major-severe storm | 25% | 20% | 10% |
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