Report of Solar Geophysical Activity (RSGA)

By Newsroom America Feeds at 30 May 2017

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast SDF Number 150 Issued at 2200Z on 30 May 2017

IA. Analysis of Solar Active Regions and Activity from 29/2100Z to 30/2100Z: 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 with a chance for a C-class flares on day one (31 May) and expected to be very low on days two and three (01 Jun, 02 Jun).

IIA. Geophysical Activity Summary 29/2100Z to 30/2100Z: The geomagnetic field has been at quiet to active levels for the past 24 hours. Solar wind speed reached a peak of 820 km/s at 29/2103Z. Total IMF reached 9 nT at 30/0235Z. The maximum southward component of Bz reached -7 nT at 30/0236Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 315 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet levels on days one and two (31 May, 01 Jun) and quiet to active levels on day three (02 Jun).

III. Event probabilities 31 May-02 Jun Class M 05/01/01 Class X 01/01/01 Proton 01/01/01 PCAF green

IV. Penticton 10.7 cm Flux Observed 30 May 074 Predicted 31 May-02 Jun 072/072/072 90 Day Mean 30 May 076

V. Geomagnetic A Indices Observed Afr/Ap 29 May 010/012 Estimated Afr/Ap 30 May 008/009 Predicted Afr/Ap 31 May-02 Jun 005/005-005/005-011/012

VI. Geomagnetic Activity Probabilities 31 May-02 Jun A. Middle Latitudes Active 10/10/20 Minor Storm 05/05/05 Major-severe storm 01/01/01 B. High Latitudes Active 15/15/15 Minor Storm 20/20/20 Major-severe storm 20/20/20


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