Viewing archive of Wednesday, 17 March 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 Mar 17 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 077 Issued at 2200Z on 17 Mar 2004IA. Analysis of Solar Active Regions and Activity from 16-2100Z to 17-2100Z Solar activity increased to low levels today. Region
574 (S02E56) showed significant growth in sunspot coverage and
magnetic complexity since yesterday. The dominant central sunspots
appear to be merging to form a small magnetic delta complex. This
region produced multiple B and C-class flares throughout the period.
Region 572 (N19W72) produced a C1 x-ray flare at 17/0931Z with an
associated Type II radio sweep that had an estimated shock velocity
of 1207 km/s. In response to this flare a CME was seen emanating
from the solar northwest limb (on LASCO imagery) which does not
appear to be Earth directed. Region 570 (S14W80) continues to show
a slow, steady decay. Regions 575 (S18W02), 576 (S18W38), and 577
(S01E77) were numbered today.
IB. Solar Activity Forecast
Solar activity is expected to be at
low levels. Region 574 has a small chance of producing an isolated
low-level M-class flare.
IIA. Geophysical Activity Summary 16-2100Z to 17-2100Z
The geomagnetic field was at quiet to unsettled levels. The greater
than 2 MeV electron fluxes at geosynchronous orbit reached high
levels today.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be at quiet to unsettled levels.
III. Event Probabilities 18 Mar to 20 Mar
| Class M | 20% | 15% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 17 Mar 110 Predicted 18 Mar-20 Mar 115/110/105 90 Day Mean 17 Mar 112
V. Geomagnetic A Indices
Observed Afr/Ap 16 Mar 006/008 Estimated Afr/Ap 17 Mar 005/007 Predicted Afr/Ap 18 Mar-20 Mar 005/008-005/008-008/015
VI. Geomagnetic Activity Probabilities 18 Mar to 20 Mar
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 25% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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