Viewing archive of Wednesday, 19 December 2007
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 2007 Dec 19 2203 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 353 Issued at 2200Z on 19 Dec 2007IA. Analysis of Solar Active Regions and Activity from 18-2100Z to 19-2100Z Solar activity was at very low levels.
IB. Solar Activity Forecast
Solar activity is expected to remain
at very low levels.
IIA. Geophysical Activity Summary 18-2100Z to 19-2100Z
The geomagnetic field was at quiet to active levels. These elevated
conditions were due to a coronal hole high speed stream. Solar wind
speed at the ACE spacecraft peaked late yesterday between 18/1900Z
and 19/0100Z with maximum values around 700 km/s. Since then solar
wind speed has been steadily declining with values around 600 km/s
at forecast issue time.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be at predominately quiet to unsettled levels. However,
there is a chance for isolated active conditions on 20 and 21
December, due to the continued influence of the high speed stream.
III. Event Probabilities 20 Dec to 22 Dec
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 19 Dec 075 Predicted 20 Dec-22 Dec 070/070/070 90 Day Mean 19 Dec 071
V. Geomagnetic A Indices
Observed Afr/Ap 18 Dec 011/018 Estimated Afr/Ap 19 Dec 012/012 Predicted Afr/Ap 20 Dec-22 Dec 010/010-010/010-008/010
VI. Geomagnetic Activity Probabilities 20 Dec to 22 Dec
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 25% |
| Minor storm | 10% | 10% | 05% |
| Major-severe storm | 05% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 15% |
| Minor storm | 15% | 15% | 05% |
| Major-severe storm | 05% | 05% | 05% |
Latest news
Monday, 22 April 2024
Lot's of sunspots! Big chance for major flare activity?
Saturday, 23 March 2024
X1.1 solar flare with earth-directed CME
Wednesday, 20 March 2024
Sunspot region 3615, G1 watch
Latest forum messages
Space Weather Memes 339AR3654 39What's up with GOES? 4Unproven theories 374Unspecified geomagnetic activity 956
More topicsSupport SpaceWeatherLive.com!
A lot of people come to SpaceWeatherLive to follow the Sun's activity or if there is aurora to be seen, but with more traffic comes higher server costs. Consider a donation if you enjoy SpaceWeatherLive so we can keep the website online!
Space weather facts
| Last X-flare | 2024/03/28 | X1.1 |
| Last M-flare | 2024/04/30 | M9.4 |
| Last geomagnetic storm | 2024/04/26 | Kp5+ (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| March 2024 | 104.9 -19.8 |
| Last 30 days | 146.4 +45.6 |