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If
primary beam of antenna is >> solar diameter, then
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imaging
is easy.
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If
primary beam of antenna is << solar diameter, imaging
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of
small regions in the disk is relatively easy.
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If
primary beam of antenna is comparable to the solar
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diameter,
good imaging is hard.
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Pointing
is most critical
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Short
spacing measurements become very important for good
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imaging
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Short
spacing measurements are hard to obtain in this regime
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(cant
get the antennas close enough together).
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Calibration
may set a minimum size of antenna.
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An
important design choice, tied to array configuration.
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