Viewing archive of Wednesday, 4 December 2002
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 2002 Dec 04 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 338 Issued at 2200Z on 04 Dec 2002IA. Analysis of Solar Active Regions and Activity from 03-2100Z to 04-2100Z Solar activity fell to very low levels. The largest
optically correlated event of the period was a B8/Sf flare from
Region 212 (N13E49) at 04/1632 UTC. Regions 207 (S19W21) and 208
(N10E08) also produced B-class flares. Region 208 retains some
magnetic complexity with mixed polarity in its leading spots. No
new regions were numbered today.
IB. Solar Activity Forecast
Solar activity is expected to remain
at very low to low levels for the early part of the forecast period,
with a slight chance for isolated moderate flare activity. Old
Region 191 (S18, L=203) is expected to return by 05 December, and
may increase the chance for moderate flare activity by the end of
the forecast period.
IIA. Geophysical Activity Summary 03-2100Z to 04-2100Z
The geomagnetic field was quiet to unsettled, with an isolated active
period observed at high latitudes during 04/1500-1800 UTC. High
flux values for greater than 2 MeV electrons at geosynchronous orbit
were observed again for the sixth consecutive day.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to unsettled, trending toward active conditions
by the end of the forecast period, due to the rotation of a
trans-equatorial coronal hole into geo-effective heliographic
longitudes. The greater than 2 MeV electron flux at geosynchronous
orbit is expected to fall below the high value threshold within the
next one to two days.
III. Event Probabilities 05 Dec to 07 Dec
| Class M | 25% | 30% | 35% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 04 Dec 149 Predicted 05 Dec-07 Dec 155/170/170 90 Day Mean 04 Dec 169
V. Geomagnetic A Indices
Observed Afr/Ap 03 Dec 007/011 Estimated Afr/Ap 04 Dec 008/012 Predicted Afr/Ap 05 Dec-07 Dec 005/010-008/010-012/015
VI. Geomagnetic Activity Probabilities 05 Dec to 07 Dec
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 20% | 25% |
| Minor storm | 01% | 01% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 30% |
| Minor storm | 05% | 05% | 10% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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