Viewing archive of Thursday, 17 May 2018
Solar activity report
Report of Solar-Geophysical Activity 2018 May 17 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 137 Issued at 2200Z on 17 May 2018IA. Analysis of Solar Active Regions and Activity from 16-2100Z to 17-2100Z
Solar activity has been at very low levels for the past 24
hours. There are currently 0 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be very low
on days one, two, and three (18 May, 19 May, 20 May).
IIA. Geophysical Activity Summary 16-2100Z to 17-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 455 km/s at 17/1931Z. Total IMF reached 10
nT at 17/1019Z. The maximum southward component of Bz reached -8 nT at
17/1010Z. Electrons greater than 2 MeV at geosynchronous orbit reached a
peak level of 12809 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on day one (18 May), quiet to unsettled
levels on day two (19 May) and quiet levels on day three (20 May).
III. Event Probabilities 18 May to 20 May
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 17 May 069 Predicted 18 May-20 May 069/069/069 90 Day Mean 17 May 069
V. Geomagnetic A Indices
Observed Afr/Ap 16 May 003/003 Estimated Afr/Ap 17 May 012/014 Predicted Afr/Ap 18 May-20 May 010/012-007/008-006/005
VI. Geomagnetic Activity Probabilities 18 May to 20 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 20% | 10% |
| Minor storm | 10% | 05% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 25% | 25% | 15% |
| Major-severe storm | 40% | 25% | 10% |
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Space weather facts
| Last X-flare: | 2017/09/10 | X8.2 |
| Last M-flare: | 2017/10/20 | M1.0 |
| Last geomagnetic storm: | 2019/08/05 | Kp5 (G1) |
| Number of spotless days in 2019: | 162 | |
| Current stretch spotless days: | 18 | |