Viewing archive of Friday, 13 April 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 Apr 13 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 104 Issued at 2200Z on 13 Apr 2012IA. Analysis of Solar Active Regions and Activity from 12-2100Z to 13-2100Z Solar activity was very low. Region 1455 (N07W19)
produced occasional B-class x-ray flares. It showed gradual spot and
penumbral growth during the period as well as a mix of polarities in
its intermediate and trailer portions, which indicated a beta-gamma
magnetic structure. New Region 1457 (N22E41) was numbered.
IB. Solar Activity Forecast
Solar activity is expected to be very
low during days 1 - 3 (14 - 16 April) with a chance for isolated
C-class flares from Region 1455.
IIA. Geophysical Activity Summary 12-2100Z to 13-2100Z
Geomagnetic field activity ranged from quiet to minor storm levels
with a brief period of major storm at high latitudes. The increased
field activity was associated with a persistent coronal hole
high-speed stream (CH HSS). Solar winds speeds gradually increased
during the first half of the period (maximum speed 693 km/s at
13/0846Z), then gradually decreased during the second half of the
period (minimum speed 544 km/s at 13/1941Z).
IIB. Geophysical Activity Forecast
Geomagnetic field activity is
expected to be at quiet to unsettled levels during days 1 - 2 (14 -
15 April) with a chance for active levels due to persistent CH HSS
effects. Activity is expected to decrease to mostly quiet levels on
day 3 (16 April) as the CH HSS subsides.
III. Event Probabilities 14 Apr to 16 Apr
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 13 Apr 098 Predicted 14 Apr-16 Apr 100/100/100 90 Day Mean 13 Apr 114
V. Geomagnetic A Indices
Observed Afr/Ap 12 Apr 011/014 Estimated Afr/Ap 13 Apr 014/020 Predicted Afr/Ap 14 Apr-16 Apr 007/012-010/012-004/005
VI. Geomagnetic Activity Probabilities 14 Apr to 16 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 25% | 15% |
| Minor storm | 20% | 15% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 35% | 30% | 20% |
| Minor storm | 25% | 20% | 10% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
Latest news
Monday, 11 November 2024
Coronal hole faces Earth
Friday, 1 November 2024
X2.0 solar flare
Wednesday, 9 October 2024
X1.8 solar flare, severe geomagnetic storm watch
Latest forum messages
AR 13901 82Sunspot Latitudes at or near Solar Maximum 76Incoming & Unnumbered Active Regions 1244The Rotations of AR 13780 and AR 13902 1Space Weather Memes 580
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 | 2024/11/06 | X2.39 |
| Last M-flare | 2024/11/20 | M1.1 |
| Last geomagnetic storm | 2024/11/10 | Kp5+ (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| October 2024 | 166.4 +25 |
| November 2024 | 142.7 -23.8 |
| Last 30 days | 155.2 +4.4 |