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| Special
Issues at Low Frequencies: |
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| Ionosphere |
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| • | Observations |
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| – | Many techniques,
including radio interferometry |
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| – | Large database in
Nançay (C. Mercier), sun and other |
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| sources, day and
night |
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| – | Very large
database in Los Alamos, made with a 9 |
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| antennas VLBI
array and satellites beacons (A. |
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| Jacobson) |
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| – | Some observations
at VLA (cosmic radio sources) |
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