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23 April 2024 |
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Saturn's Magnetic Field and Magnetosphere | | E J Smith
; L Davis
; D E Jones
; P J Coleman
; D S Colburn
; P Dyal
; C P Sonett
; | | Date: |
25 Jan 1980 | | Journal: | Science, 207 (4429), 407-410 | | Abstract: | The Pioneer Saturn vector helium magnetometer has detected a bow shock and magnetopause at Saturn and has provided an accurate characterization of the planetary field. The equatorial surface field is 0.20 gauss, a factor of 3 to 5 times smaller than anticipated on the basis of attempted scalings from Earth and Jupiter. The tilt angle between the magnetic dipole axis and Saturn’s rotation axis is < 1 degrees , a surprisingly small value. Spherical harmonic analysis of the measurements shows that the ratio of quadrupole to dipole moments is < 10 percent, indicating that the field is more uniform than those of the Earth or Jupiter and consistent with Saturn having a relatively small core. The field in the outer magnetosphere shows systematic departures from the dipole field, principally a compression of the field near noon and an equatorial orientation associated with a current sheet near dawn. A hydromagnetic wake resulting from the interaction of Titan with the rotating magnetosphere appears to have been observed. | | Source: | PubMed, pmid17833549 doi: 10.1126/science.207.4429.407 | | Services: | Forum | Review | Favorites | |
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