Viewing archive of Sunday, 28 July 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 Jul 28 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 209 Issued at 2200Z on 28 Jul 2013IA. Analysis of Solar Active Regions and Activity from 27-2100Z to 28-2100Z 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
28/1221Z from Region 1800 (S08W74). There are currently 4 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be low with a
slight chance for an M-class flare on day one (29 Jul) and expected to
be very low with a chance for a C-class flares and a slight chance for
an M-class flare on days two and three (30 Jul, 31 Jul).
IIA. Geophysical Activity Summary 27-2100Z to 28-2100Z
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 521 km/s at
28/1328Z. Total IMF reached 6 nT at 28/0621Z. The maximum southward
component of Bz reached -5 nT at 27/2116Z. Electrons greater than 2 MeV
at geosynchronous orbit reached a peak level of 365 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet levels on days one, two, and three (29 Jul, 30 Jul, 31
Jul).
III. Event Probabilities 29 Jul to 31 Jul
| Class M | 10% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 28 Jul 109 Predicted 29 Jul-31 Jul 110/120/120 90 Day Mean 28 Jul 120
V. Geomagnetic A Indices
Observed Afr/Ap 27 Jul 010/010 Estimated Afr/Ap 28 Jul 007/007 Predicted Afr/Ap 29 Jul-31 Jul 005/005-004/005-004/005
VI. Geomagnetic Activity Probabilities 29 Jul to 31 Jul
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 20% | 20% | 20% |
| Major-severe storm | 10% | 10% | 10% |
All times in UTC
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