Viewing archive of Tuesday, 18 December 2012
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 2012 Dec 18 2200 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 18 Dec 2012IA. Analysis of Solar Active Regions and Activity from 17-2100Z to 18-2100Z
Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C1 event observed at
18/1308Z from Region 1631 (N23W89). There are currently 4 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be at low
levels with a slight chance for M-class flares on days one, two, and
three (19 Dec, 20 Dec, 21 Dec).
IIA. Geophysical Activity Summary 17-2100Z to 18-2100Z
The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed,
as measured by the ACE spacecraft, reached a peak speed of 547 km/s at
18/0822Z. Total IMF reached 8.8 nT at 18/0213Z. The maximum southward
component of Bz reached -6.6 nT at 17/2319Z. Electrons greater than 2
MeV at geosynchronous orbit reached a peak level of 481 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet levels for the next three days (19 Dec, 20 Dec, 21 Dec).
III. Event Probabilities 19 Dec to 21 Dec
| Class M | 15% | 15% | 15% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 18 Dec 116 Predicted 19 Dec-21 Dec 115/115/115 90 Day Mean 18 Dec 120
V. Geomagnetic A Indices
Observed Afr/Ap 17 Dec 009/010 Estimated Afr/Ap 18 Dec 007/007 Predicted Afr/Ap 19 Dec-21 Dec 006/008-006/005-006/005
VI. Geomagnetic Activity Probabilities 19 Dec to 21 Dec
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 05% | 05% | 05% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 15% | 15% | 15% |
| Major-severe storm | 05% | 05% | 05% |
All times in UTC
Current data suggests there is a slight possibility for aurora to appear at the following high latitude regions in the near future
Iqaluit, NUNuuk
Rovaniemi, Sodankylä, Utsjoki
Reykjavik
Tromsø
Kiruna
Latest news
Wednesday, 5 March 2025
Coronal hole faces Earth
Sunday, 23 February 2025
X2.0 solar flare from sunspot region 4001
Friday, 7 February 2025
Coronal hole faces Earth, Minor G1 geomagnetic storm watch
Latest forum messages
Coronal Hole 22 89Filaments and prominences 720Ask your obscure/"stupid" space weather questions. 343IP cameras for sky surveillance 53Incoming & Unnumbered Active Regions 1629
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!
Latest alerts
Saturday, 15 March 2025
13:48 UTC - Hemispheric Power Index
The OVATION model predicts the Hemispheric Power Index to reach 52GW at 14:31 UTC
Space weather facts
| Last X-flare | 2025/02/23 | X2.0 |
| Last M-flare | 2025/03/14 | M1.1 |
| Last geomagnetic storm | 2025/03/14 | Kp6- (G2) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| February 2025 | 154.6 +17.6 |
| March 2025 | 125.9 -28.7 |
| Last 30 days | 136.5 -20.3 |