Viewing archive of Tuesday, 27 July 2010
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 2010 Jul 27 2201 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 208 Issued at 2200Z on 27 Jul 2010IA. Analysis of Solar Active Regions and Activity from 26-2100Z to 27-2100Z Solar activity increased to low levels. Region 1089
(S23W35) produced a C2 flare at 27/0424Z, as well as occasional
B-class flares. Region 1089 continued to gradually decay in spot
count and area. Regions 1090 (N22E19) and 1091 (N12W86) decayed to
spotless plage regions. No new regions were assigned.
IB. Solar Activity Forecast
Solar activity is expected to be at
very low levels. However, there will be a chance for an isolated
C-class flare from Region 1089.
IIA. Geophysical Activity Summary 26-2100Z to 27-2100Z
Geomagnetic field activity increased to unsettled to active levels as
a recurrent coronal hole high-speed wind stream continued. The
activity increase was associated with enhanced interplanetary
magnetic field (IMF) intensity (peak 9 nT at 27/0145Z) combined with
intermittent periods of southward IMF Bz (maximum deflection -8 nT
at 27/0216Z) and increased velocities (peak 641 km/sec at 27/0946Z).
IIB. Geophysical Activity Forecast
Geomagnetic field activity is
expected to decrease to quiet to unsettled levels during days 1 - 2
(28 - 29 July) as the coronal hole high-speed stream gradually
subsides. Quiet conditions are expected on day 3 (30 July).
III. Event Probabilities 28 Jul to 30 Jul
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 27 Jul 083 Predicted 28 Jul-30 Jul 082/082/082 90 Day Mean 27 Jul 075
V. Geomagnetic A Indices
Observed Afr/Ap 26 Jul 005/006 Estimated Afr/Ap 27 Jul 015/015 Predicted Afr/Ap 28 Jul-30 Jul 008/010-007/008-005/005
VI. Geomagnetic Activity Probabilities 28 Jul to 30 Jul
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 10% | 05% |
| Minor storm | 05% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 15% | 10% |
| Minor storm | 05% | 05% | 01% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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