Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p31b1399s&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #P31B-1399
Physics
1517 Magnetic Anomalies: Modeling And Interpretation, 1595 Planetary Magnetism: All Frequencies And Wavelengths, 5440 Magnetic Fields And Magnetism, 5464 Remote Sensing, 5494 Instruments And Techniques
Scientific paper
In the 2007 AGU fall meeting, we reported an objective scheme for estimating the spatial (3-d) distribution of the lunar crustal magnetic field from the satellite magnetometer data, and applied it to the Reiner Gamma magnetic anomaly on the nearside of the moon. Here, we provide the global vector map of the lunar crustal magnetic field using this scheme with Lunar Prospector Magnetometer (LP-MAG) low-altitude datasets. The scheme is a variant of the equivalent source method for estimating the magnetic field distribution. The features of our scheme are (1) utilising magnetic monopoles the equivalent sources, (2) simultaneous calculation for subtracting the trend due to the varying external magnetic field with the intensity of equivalent sources, and (3) Akaike's Bayesian Information Criterion (ABIC) minimization for determining the damping factor of the damped least square calculation, which endorses objectivity to the scheme. In this study, we select LP-MAG data of quiet times in all area of the Moon, and produce the global lunar crustal field map at altitudes of 40 km. Utilizing the data obtained at different altitudes, we were able to find more than two sets of reasonably stable data in all regions of the Moon, except for a few parts of the polar regions and the western mid-latitude region on the lunar farside. Following the visual inspection of the magnetic field distribution, the Moon is divided into 96 fan-shaped areas, where the scheme is individually applied. As a result of calculation, the magnetic filed is stably estimated. From the resultant equivalent poles representation, the magnetic field at the KAGUYA orbit is calculated and compared with the LMAG(Lunar MAGnetometer) observations. Their agreement is astonishing in several areas, showing that the scheme works well, as well as the good accuracy of the KAGUYA-LMAG observations.
Matsushima Masaki
Shibuya Hidetoshi
Shimizu Hisashi
Takahashi Fuminobu
Toyoshima Morio
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