What kind of observations were made by Magellan during the various cycles?
During the first three cycles, Magellan made primarily radar, altimeter, and radiometer observations of Venus’ surface. Subsequent cycles were dedicated primarily to gravimetric observations. The orbit was circularized by aerobraking between cycles 4 and 5. Other kinds of observations (solar corona, atmospheric, etc.) were also made during some of these cycles. • What exactly are Magellan F-BIDRs, F-MIDRs and C-MIDRs? Magellan raw Synthetic Aperture Radar (SAR) data is processed to create Basic Image Data Records or BIDRs. F-BIDRs are simply Full-resolution (~75 m/pixel) Basic Image Data Records, which look like long, thin strips of radar imagery, representing one pass of the Magellan spacecraft. These are difficult to use for geologic interpretation because they are only about 20 Km wide by 17,000 Km long, so a mosaic of these images is produced, a Full-resolution Mosaicked Image Data Record, or F-MIDR. The F-MIDRs are high resolution radar “pictures” of the surface of Venus. An F-MID
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