Viewing archive of Friday, 24 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 24 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 144 Issued at 2200Z on 24 May 2013IA. Analysis of Solar Active Regions and Activity from 23-2100Z to 24-2100Z 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
24/0124Z. 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 (25 May, 26 May,
27 May).
IIA. Geophysical Activity Summary 23-2100Z to 24-2100Z
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 621 km/s at 24/2058Z. Total IMF reached 15 nT at 24/1739Z. The
maximum southward component of Bz reached -14 nT at 24/1738Z. Protons
greater than 10 MeV at geosynchronous orbit reached a peak level of 368
pfu at 23/2105Z. Electrons greater than 2 MeV at geosynchronous orbit
reached a peak level of 2063 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on day one (25 May) and quiet to
unsettled levels on days two and three (26 May, 27 May). Protons are
likely to continue above threshold levels on day one (25 May), have a
chance of remaining above threshold on day two (26 May) and have a
slight chance of remaining above threshold on day three (27 May).
III. Event Probabilities 25 May to 27 May
| Class M | 25% | 25% | 25% |
| Class X | 01% | 01% | 01% |
| Proton | 60% | 30% | 10% |
| PCAF | yellow | ||
IV. Penticton 10.7 cm Flux
Observed 24 May 127 Predicted 25 May-27 May 130/125/125 90 Day Mean 24 May 122
V. Geomagnetic A Indices
Observed Afr/Ap 23 May 008/008 Estimated Afr/Ap 24 May 014/019 Predicted Afr/Ap 25 May-27 May 014/022-008/012-007/008
VI. Geomagnetic Activity Probabilities 25 May to 27 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 20% | 10% |
| Minor storm | 20% | 05% | 01% |
| Major-severe storm | 05% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 15% | 15% |
| Minor storm | 30% | 25% | 20% |
| Major-severe storm | 55% | 25% | 20% |
All times in UTC
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