• Equatorial Regions
• High-Latitude Region
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These predictions are from a climatology of the distribution of the level of scintillation activity observed in the selected locations and times for the solar and geomagnetic conditions predicted for the specified dates and times by the NOAA Space Environment Center. For the three equatorial cases, we have selected the scintillation levels corresponding to the 90th percentile in the climatology. For the two high-latitude cases, we have selected the 50th percentile.

NOAA/SEC predictions used were generated on 06 May 2009

Equatorial Region

These maps show the probability that the S4 intensity scintillation index exceeds 0.5 (an indication of moderate/high scintillation levels) on ground-to-geostationary paths in three equatorial sectors for solar maximum conditions. In each map, the location of the satellite is indicated by a black star. All maps are for a system frequency of 250 MHz.

Environmental conditions used in model:

• Date: 07 May 2009
• Sunspot Number: 8.5
• Kp: 2o
• Frequency: 160.0 MHz

Far East Sector - 1330 UT (35KB)

Middle East Sector - 1800 UT (35KB)

South America Sector - 0100 UT (35KB)

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High-latitude Region

These maps show the distribution of the height-integrated strength (denoted CkL) of the electron-density irregularities that cause scintillation over the northern auroral and polar regions for a particular time. The time of the first map (0600 GMT) was selected to place the midnight sector over Canada and the US, and the time of the second map (2300 GMT) was selected to place the midnight sector over northern Europe.

Environmental conditions used in model:

• Date: 07 May 2009
• Sunspot Number: 8.5
• Kp: 2o

American Sector - 0600 UT (40KB)

European Sector - 2300 UT (40KB)

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AKNOWLEDGEMENTS

All images were generated using the public-domain Generic Mapping Tool (GMT) graphics package.

PostScript to GIF conversions are made with the Image Alchemy PS program from Handmade Software, Inc.