Diamagnetic Solar-Wind Cavity Discovered behind Moon

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Science  24 Nov 1967:
Vol. 158, Issue 3804, pp. 1040-1042
DOI: 10.1126/science.158.3804.1040


Preliminary Ames-magnetometer data from Explorer 35, the lunar orbiter, show no evidence of a lunar bow shock. However, an increase of the magnetic field by about 1.5 gamma (over the interplanetary value) is evident on Moon's dark side, as well as dips in field strength at the limbs. Interpretation of these spatial variations in the field as deriving from plasma diamagnetism is consistent with a plasma void on the dark side, and steady-state (B = 0) magnetic transparency of Moon.