:Product: 20010406RSGA.txt :Issued: 2001 Apr 06 2200 UTC # Prepared jointly by the U.S. Dept. of Commerce, NOAA, # Space Environment Center and the U.S. Air Force. # Joint USAF/NOAA Report of Solar and Geophysical Activity SDF Number 096 Issued at 2200Z on 06 Apr 2001 IA. Analysis of Solar Active Regions and Activity from 05/2100Z to 06/2100Z: Solar activity has been high during the past 24 hours. Region 9415 (S21E33) produced an X5/Sf flare at 1921Z (Please note that the optical class could only be measured well after the x-ray flare maximum due to weather hampering observations). Coronagraph observations from SOHO/LASCO showed a CME associated with this event just entering the C2 field of view at 1930Z. Region 9415 is the dominant region on the disk with 820 millionths area in an Eko, beta-gamma-delta configuration. The only other solar flares of note today were a few C-class subflares. Coronagraph data also showed that yesterday's CME, associated with the long-duration M5 event, could be classified as a full-halo event. Nonetheless the sequence of images give the impression that the center of the CME is not headed directly at the Earth. Note that today's 10.7 cm flux had to be estimated from the morning reading because intense solar radio burst activity interfered with the normal noontime reading. IB. Solar Activity Forecast: Solar activity is expected to be moderate to high during the next three days. Region 9415 is clearly the dominant region on the disk to watch for energetic flare activity, although regions 9417 and 9418 might possibly contribute a low-level M-class event. IIA. Geophysical Activity Summary 05/2100Z to 06/2100Z: The geomagnetic field was mostly quiet to unsettled during the past 24 hours. Solar wind speeds continue to decline and solar wind density remains low. The greater than 10 MeV proton event continued to decline during the past 24 hours. As of 06/2100Z the fluxes were fluctuating below and above the threshold of 10 PFU, with a reading of 10.2 PFU at 2100Z. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be unsettled for the next 24 hours. An increase to active levels is expected on the second and third days as a response to a glancing blow from the halo CME associated with yesterday's M5 flare and possible additional influence from the CME associated with today's X5 event. There is a fair chance for an increase in the greater than 10 MeV proton fluxes sometime in the next 24 hours in response to today's X5 event as well, although the fluxes are likely to increase rather gradually with peak fluxes in the low 100's of PFU, and the spectrum will probably be relatively soft. III. Event Probabilities 07 Apr-09 Apr Class M 80/80/80 Class X 25/25/25 Proton 60/25/25 PCAF yellow IV. Penticton 10.7 cm Flux Observed 06 Apr 192 Predicted 07 Apr-09 Apr 200/195/190 90 Day Mean 06 Apr 167 V. Geomagnetic A Indices Observed Afr/Ap 05 Apr 011/019 Estimated Afr/Ap 06 Apr 012/015 Predicted Afr/Ap 07 Apr-09 Apr 012/012-025/025-025/025 VI. Geomagnetic Activity Probabilities 07 Apr-09 Apr A. Middle Latitudes Active 20/35/35 Minor storm 10/20/20 Major-severe storm 05/25/30 B. High Latitudes Active 25/40/40 Minor storm 15/25/25 Major-severe storm 05/15/30