Viewing archive of Saturday, 16 May 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 May 16 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 136 Issued at 2200Z on 16 May 2015IA. Analysis of Solar Active Regions and Activity from 15-2100Z to 16-2100Z Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C2 event observed at
15/2329Z from Region 2339 (N12W59). There are currently 7 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be low with
a slight chance for an M-class flare on days one and two (17 May, 18
May) and expected to be very low with a chance for a C-class flares on
day three (19 May).
IIA. Geophysical Activity Summary 15-2100Z to 16-2100Z
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 518 km/s at
16/0033Z. Electrons greater than 2 MeV at geosynchronous orbit reached a
peak level of 11005 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at unsettled to minor storm levels on day one (17 May), quiet to
active levels on day two (18 May) and unsettled levels on day three (19
May).
III. Event Probabilities 17 May to 19 May
| Class M | 15% | 15% | 05% |
| Class X | 05% | 05% | 01% |
| Proton | 05% | 05% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 16 May 131 Predicted 17 May-19 May 125/115/105 90 Day Mean 16 May 128
V. Geomagnetic A Indices
Observed Afr/Ap 15 May 007/008 Estimated Afr/Ap 16 May 006/006 Predicted Afr/Ap 17 May-19 May 016/020-012/015-011/012
VI. Geomagnetic Activity Probabilities 17 May to 19 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 25% |
| Minor storm | 15% | 10% | 05% |
| Major-severe storm | 05% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 15% | 15% |
| Minor storm | 25% | 30% | 25% |
| Major-severe storm | 45% | 40% | 30% |
All times in UTC
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