Joint USAF/NOAA Solar Geophysical Activity Report and Forecast 18 October 2019

Status Report From: Space Weather Prediction Center (NOAA)
Posted: Friday, October 18, 2019

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast SDF Number 291 Issued at 2200Z on 18 Oct 2019 IA. Analysis of Solar Active Regions and Activity from 17/2100Z to 18/2100Z: 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 (19 Oct, 20 Oct, 21 Oct). IIA. Geophysical Activity Summary 17/2100Z to 18/2100Z: The geomagnetic field has been at quiet levels for the past 24 hours. Solar wind speed reached a peak of 478 km/s at 18/1528Z. Total IMF reached 5 nT at 18/1637Z. The maximum southward component of Bz reached -4 nT at 18/0303Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 158 pfu.

IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet levels on days one and two (19 Oct, 20 Oct) and quiet to active levels on day three (21 Oct).

III. Event probabilities 19 Oct-21 Oct Class M 01/01/01 Class X 01/01/01 Proton 01/01/01 PCAF green IV. Penticton 10.7 cm Flux Observed 18 Oct 066 Predicted 19 Oct-21 Oct 066/066/066 90 Day Mean 18 Oct 068 V. Geomagnetic A Indices Observed Afr/Ap 17 Oct 004/004 Estimated Afr/Ap 18 Oct 005/005 Predicted Afr/Ap 19 Oct-21 Oct 006/005-006/005-009/012 VI. Geomagnetic Activity Probabilities 19 Oct-21 Oct A. Middle Latitudes Active 05/05/30 Minor Storm 01/01/10 Major-severe storm 01/01/01 B. High Latitudes Active 15/15/15 Minor Storm 15/15/30 Major-severe storm 05/05/40

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