Viewing archive of Saturday, 19 July 2003
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 2003 Jul 19 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 200 Issued at 2200Z on 19 Jul 2003IA. Analysis of Solar Active Regions and Activity from 18-2100Z to 19-2100Z Solar activity was low. Regions 410 (S12W13) and 412
(N16W20) produced several low C-class flares over the past 24 hours.
Region 410 continues to develop at a considerable pace in both size
and magnetic complexity. Region 412 is developing at a slower rate,
but also has significant complexity in a compact spot group. New
Region 415 (N13E30) was numbered today and produced a small C-class
flare at 19/1734Z. Region 409 (N15W08) continues to simplify and
decay. Remaining regions were stable.
IB. Solar Activity Forecast
Solar activity is expected to be low
to moderate. There is a good chance for M-class activity from
Regions 410 and 412.
IIA. Geophysical Activity Summary 18-2100Z to 19-2100Z
The geomagnetic field was mostly unsettled to active with isolated
minor storm periods during local nighttime hours. Solar wind speed
began a gradual rise from near 500 km/s midway through the period to
approximately 650 km/s by the end of the period.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to continue at mostly unsettled to active periods through
day one with isolated minor storm periods possible. Quiet to
unsettled levels are expected on days two and three with isolated
active periods likely.
III. Event Probabilities 20 Jul to 22 Jul
| Class M | 50% | 50% | 50% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 19 Jul 146 Predicted 20 Jul-22 Jul 150/155/155 90 Day Mean 19 Jul 127
V. Geomagnetic A Indices
Observed Afr/Ap 18 Jul 011/014 Estimated Afr/Ap 19 Jul 020/015 Predicted Afr/Ap 20 Jul-22 Jul 015/015-012/010-010/010
VI. Geomagnetic Activity Probabilities 20 Jul to 22 Jul
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 30% | 30% |
| Minor storm | 20% | 15% | 15% |
| Major-severe storm | 05% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 40% | 35% | 35% |
| Minor storm | 25% | 20% | 20% |
| Major-severe storm | 05% | 05% | 05% |
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