title: Lunar magnetic field: permanent and induced dipole moments.
abstract: Apollo 15 subsatellite magnetic field observations have been used to measure both the permanent and the induced lunar dipole moments. Although only an upper limit of 1.3 x 10(18) gauss-cubic centimeters has been determined for the permanent dipole moment in the orbital plane, there is a significant induced dipole moment which opposes the applied field, indicating the existence of a weak lunar ionosphere.
authors.forename: C T
authors.initials: CT
authors.lastname: Russell
authors.forename: P J
authors.initials: PJ
authors.lastname: Coleman
authors.forename: G
authors.initials: G
authors.lastname: Schubert