Viewing archive of Sunday, 20 September 2015
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 2015 Sep 20 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 263 Issued at 2200Z on 20 Sep 2015IA. Analysis of Solar Active Regions and Activity from 19-2100Z to 20-2100Z Solar activity has been at moderate levels for the past 24
hours. The largest solar event of the period was a M2 event observed at
20/1803Z from Region 2415 (S19W56). There are currently 4 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be low with
a chance for M-class flares on days one, two, and three (21 Sep, 22 Sep,
23 Sep).
IIA. Geophysical Activity Summary 19-2100Z to 20-2100Z
The geomagnetic
field has been at unsettled to severe storm levels for the past 24
hours. Solar wind speed, as measured by the ACE spacecraft, reached a
peak speed of 627 km/s at 20/0711Z. Total IMF reached 22 nT at 20/0536Z.
The maximum southward component of Bz reached -17 nT at 20/0535Z.
Protons greater than 10 MeV at geosynchronous orbit reached a peak level
of 3 pfu at 20/2045Z. Electrons greater than 2 MeV at geosynchronous
orbit reached a peak level of 383 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at unsettled to minor storm levels on day one (21 Sep), unsettled
to active levels on day two (22 Sep) and quiet to unsettled levels on
day three (23 Sep). Protons greater than 10 Mev have a slight chance of
crossing threshold on days one and two (21 Sep, 22 Sep).
III. Event Probabilities 21 Sep to 23 Sep
| Class M | 40% | 40% | 40% |
| Class X | 05% | 05% | 05% |
| Proton | 10% | 10% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 20 Sep 110 Predicted 21 Sep-23 Sep 110/110/110 90 Day Mean 20 Sep 104
V. Geomagnetic A Indices
Observed Afr/Ap 19 Sep 012/011 Estimated Afr/Ap 20 Sep 031/044 Predicted Afr/Ap 21 Sep-23 Sep 022/020-014/012-007/008
VI. Geomagnetic Activity Probabilities 21 Sep to 23 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 40% | 25% | 10% |
| Minor storm | 20% | 10% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 15% | 20% |
| Minor storm | 30% | 30% | 25% |
| Major-severe storm | 50% | 35% | 20% |
All times in UTC
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