Viewing archive of Sunday, 16 September 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 Sep 16 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 260 Issued at 2200Z on 16 Sep 2012IA. Analysis of Solar Active Regions and Activity from 15-2100Z to 16-2100Z Solar activity was very low. New Region 1573 (N17E62 -
Axx/alpha) produced occasional B-class flares as it rotated into
view. Region 1566 (N23W89 - Hrx/alpha) produced a B-class flare as
it approached the west limb. Region 1569 (S12W13 - Cso/beta) showed
gradual spot and penumbral decay in its intermediate and trailer
portions. New Region 1574 (S25W15 - Bxo/beta), a small
reverse-polarity group, was also numbered. No Earth-directed CME activity
occurred during the period.
IB. Solar Activity Forecast
Solar activity is expected to be very
low through the period (17 - 19 September) with a chance for a
C-class flare.
IIA. Geophysical Activity Summary 15-2100Z to 16-2100Z
Geomagnetic field activity was at quiet to unsettled levels. An
increase to unsettled levels occurred late in the period associated
with the onset of a solar sector boundary crossing (SSBC).
Intermittent periods of weakly-southward IMF Bz along with minor
increases in solar wind speeds and IMF Bt were associated with the
SSBC.
IIB. Geophysical Activity Forecast
Geomagnetic field activity is
expected to remain at quiet to unsettled levels on day 1 (17
September) due to minor changes in the solar wind. A decrease to
quiet levels is expected on day 2 (18 September). Activity is
expected to increase to quiet to unsettled levels on day 3 (19
September), with a slight chance for active levels, as a coronal
hole high-speed stream begins to disturb the field.
III. Event Probabilities 17 Sep to 19 Sep
| Class M | 10% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 16 Sep 097 Predicted 17 Sep-19 Sep 095/095/100 90 Day Mean 16 Sep 122
V. Geomagnetic A Indices
Observed Afr/Ap 15 Sep 005/006 Estimated Afr/Ap 16 Sep 006/008 Predicted Afr/Ap 17 Sep-19 Sep 007/010-006/005-007/008
VI. Geomagnetic Activity Probabilities 17 Sep to 19 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 15% | 15% |
| Minor storm | 20% | 15% | 25% |
| Major-severe storm | 10% | 05% | 15% |
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
Filaments and prominences 481AR 13901 90Incoming & Unnumbered Active Regions 1245Sunspot Latitudes at or near Solar Maximum 76The Rotations of AR 13780 and AR 13902 1
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 |