Joint USAF/NOAA Solar Geophysical Activity Report and Forecast
SDF Number 106 Issued at 2200Z on 16 Apr 2015
IA. 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 C5 event observed at 16/0907Z from Region 2324 (N18E34). There are currently 5 numbered sunspot regions on the disk.
IB. Solar Activity Forecast: Solar activity is expected to be low with a chance for M-class flares and a slight chance for an X-class flare on days one, two, and three (17 Apr, 18 Apr, 19 Apr).
IIA. Geophysical Activity Summary 15/2100Z to 16/2100Z: The geomagnetic field has been at unsettled to minor storm levels for the past 24 hours. Solar wind speed, as measured by the ACE spacecraft, reached a peak speed of 720 km/s at 16/2049Z. Total IMF reached 13 nT at 16/0503Z. The maximum southward component of Bz reached -12 nT at 16/0524Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 2108 pfu.
IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at unsettled to minor storm levels on day one (17 Apr) and quiet to unsettled levels on days two and three (18 Apr, 19 Apr).