Abstract
Two-dimensional isophotes of the extreme solar corona (r max ∼ 45 R ⊙) have been derived from integrated vidicon pictures taken from the Moon's surface by the unmanned probes Surveyors 6 and 7. These data were calibrated through use of previously published values for the coronal brightness gradient along the ecliptic. The resulting structure of the outer corona is compared to ground-based observations of the innermost corona 1.125 ⩽ r/R ⊙ ⩽ 2.0 made by the High Altitude Observatory K-coronameter. The possible existence of a streamer seen by Surveyor 7 is analyzed over the region 15 ⩽ r ⩽ 22.5 R ⊙.
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