- Press Release
- August 9, 2022
Joint USAF/NOAA Solar Geophysical Activity Report and Forecast 17 February 2018
Joint USAF/NOAA Solar Geophysical Activity Report and Forecast
SDF Number 48 Issued at 2200Z on 17 Feb 2018
IA. 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 Feb, 19 Feb, 20 Feb).
IIA. Geophysical Activity Summary 16/2100Z to 17/2100Z: The geomagnetic field has been at quiet to active levels for the past 24 hours. Solar wind speed reached a peak of 533 km/s at 17/1451Z. Total IMF reached 9 nT at 16/2105Z. The maximum southward component of Bz reached -7 nT at 17/0032Z.
IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to active levels on days one and three (18 Feb, 20 Feb) and quiet to unsettled levels on day two (19 Feb).
III. Event probabilities 18 Feb-20 Feb
Class M 01/01/01
Class X 01/01/01
IV. Penticton 10.7 cm Flux
Observed 17 Feb 069
Predicted 18 Feb-20 Feb 068/068/068
90 Day Mean 17 Feb 072
V. Geomagnetic A Indices
Observed Afr/Ap 16 Feb 007/007
Estimated Afr/Ap 17 Feb 012/012
Predicted Afr/Ap 18 Feb-20 Feb 011/012-009/010-010/012
VI. Geomagnetic Activity Probabilities 18 Feb-20 Feb
A. Middle Latitudes
Minor Storm 10/05/10
Major-severe storm 01/01/01
B. High Latitudes
Minor Storm 30/25/30
Major-severe storm 30/20/30