Viewing archive of Tuesday, 21 July 2009
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 2009 Jul 21 2201 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 202 Issued at 2200Z on 21 Jul 2009IA. Analysis of Solar Active Regions and Activity from 20-2100Z to 21-2100Z Solar activity was very low. No flares occurred during
the past 24 hours. The solar disk continues to be void of sunspots.
IB. Solar Activity Forecast
Solar activity is expected to be very
low for the next three days (22-24 July).
IIA. Geophysical Activity Summary 20-2100Z to 21-2100Z
The geomagnetic field was quiet during the past 24 hours. A solar
sector boundary crossing from negative to positive was observed at
the ACE spacecraft around 0145Z; yesterdays anticipated high speed
stream did not materialize as solar wind speeds held steady in the
range between 300-340 km/s. There was a possible second solar sector
boundary crossing back to negative polarity at about 1800Z.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet for the next three days (22-24 July).
III. Event Probabilities 22 Jul to 24 Jul
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 21 Jul 068 Predicted 22 Jul-24 Jul 068/068/068 90 Day Mean 21 Jul 069
V. Geomagnetic A Indices
Observed Afr/Ap 20 Jul 003/006 Estimated Afr/Ap 21 Jul 005/005 Predicted Afr/Ap 22 Jul-24 Jul 005/005-005/005-005/005
VI. Geomagnetic Activity Probabilities 22 Jul to 24 Jul
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 05% | 05% | 05% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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