Viewing archive of Tuesday, 13 July 2004
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 2004 Jul 13 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 195 Issued at 2200Z on 13 Jul 2004IA. Analysis of Solar Active Regions and Activity from 12-2100Z to 13-2100Z Solar activity was high. Region 646 (N13W60) emerged
rapidly during the past 24 hours and produced three major flares: an
M6 at 0017 UTC, an M5/1n at 0848 UTC, and an M6/1b at 1932 UTC.
CME's were observed in association with the first and second major
flares which were technically classified as halo events, although
the majority of the mass erupted off the northwest limb. Region 646
grew from 70 to 220 millionths and has some magnetic complexity
along a northeast-to-southwest inversion line. Region 649 (S10E64)
is the largest group on the disk with an area of 350 millionths. The
region produced numerous C-class events as well as two M-class
flares: an M2 at 1208 UTC and an M1/Sf at 1838 UTC.
IB. Solar Activity Forecast
Solar activity is expected to be
mostly moderate, with Region 646 and 649 the most likely sources for
activity. There is a fair chance for continued major flare activity,
particularly out of Region 646.
IIA. Geophysical Activity Summary 12-2100Z to 13-2100Z
The geomagnetic field ranged from quiet to active levels during the
past 24 hours. Solar wind data countinue to show that the earth is
under the influence of a high-speed stream driven by a coronal hole
(with typical speeds today between 500 to 600 km/s). There was an
enhancement of greater than 10 MeV protons, which began around 0100
UTC and reached maximum values of about 1 PFU.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be mostly unsettled for the next three days. Unsettled
with some active periods at high latitudes is expected on the third
day as a possible response to a glancing blow from one or the other
of today's CMEs.
III. Event Probabilities 14 Jul to 16 Jul
| Class M | 75% | 75% | 75% |
| Class X | 15% | 15% | 15% |
| Proton | 15% | 15% | 15% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 13 Jul 127 Predicted 14 Jul-16 Jul 135/140/140 90 Day Mean 13 Jul 098
V. Geomagnetic A Indices
Observed Afr/Ap 12 Jul 012/013 Estimated Afr/Ap 13 Jul 012/015 Predicted Afr/Ap 14 Jul-16 Jul 010/012-010/012-012/020
VI. Geomagnetic Activity Probabilities 14 Jul to 16 Jul
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 35% |
| Minor storm | 15% | 15% | 15% |
| Major-severe storm | 05% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 35% | 35% | 40% |
| Minor storm | 20% | 20% | 20% |
| Major-severe storm | 05% | 05% | 05% |
All times in UTC
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