Passive microwave techniques for geophysical probing from aircraft and space have employed frequencies~ 1-300GHz and have yielded information about atmospheric temperature and composition profiles and about surface parameters such as sea state, ice and snow type and extent, soil moisture, etc. The initially scientific program is now evolving into various operational spacecraft observatory systems; this mini-review summarizes recent accomplishments and future opportunities.
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D. H. Staelin (1981) studied this question.
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