Joint USAF/NOAA Report of Solar and Geophysical Activity 26 Jun 2007

Product: Report of Solar-Geophysical Activity
Issued: 2007 Jun 26 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 177 Issued at 2200Z on 26 Jun 2007

IA. Analysis of Solar Active Regions and Activity from 25/2100Z to 26/2100Z: Solar activity was very low. Region 961 (S11E60) remains an Hsx alpha sunspot group. No significant flare activity occurred during the last 24 hours.

IB. Solar Activity Forecast: Solar activity is expected to be very low, with a slight chance for C-class flares late in the period.

IIA. Geophysical Activity Summary 25/2100Z to 26/2100Z: The geomagnetic field was quiet to unsettled. The greater than 2 MeV electron flux at geosynchronous orbit reached high levels again today.

IIB. Geophysical Activity Forecast: The geomagnetic field is expected to range from quiet to unsettled. Active periods are possible, particularly at high latitudes, on 29 June.

III. Event Probabilities 27 Jun-29 Jun

• Class M 01/01/01
• Class X 01/01/01
• Proton 01/01/01
• PCAF Green

IV. Penticton 10.7 cm Flux

• Observed 26 Jun 071
• Predicted 27 Jun-29 Jun 075/080/080
• 90 Day Mean 26 Jun 074

V. Geomagnetic A Indices

• Observed Afr/Ap 25 Jun 003/005
• Estimated Afr/Ap 26 Jun 004/005
• Predicted Afr/Ap 27 Jun-29 Jun 003/005-005/005-006/008

VI. Geomagnetic Activity Probabilities 27 Jun-29 Jun

A. Middle Latitudes

• Active 10/10/15
• Minor storm 05/05/05
• Major-severe storm 01/01/01

B. High Latitudes

• Active 15/15/25
• Minor storm 05/05/15
• Major-severe storm 01/01/01