You have already added 0 works in your ORCID record related to the merged Research product.
An improved crustal magnetic field map of Mars from electron reflectometry: Highland volcano magmatic history and the end of the martian dynamo
Copyright policy )Abstract We apply improved kinetic modeling of electron transport in the martian thermosphere to fit pitch angle distributions measured by the Mars Global Surveyor (MGS) Magnetometer/Electron Reflectometer (MAG/ER), together with appropriate filtering, binning, averaging and error correction techniques, to create the most reliable ER global map to date of crustal magnetic field magnitude at 185 km altitude, with twice the spatial resolution and considerably higher sensitivity to crustal fields than global maps of magnetic field components produced with MAG data alone. This map compares favorably to sparsely sampled dayside MAG data taken at similar altitudes, insofar as a direct comparison is meaningful. Using this map, we present two case studies. The first compares the magnetic signatures of two highland volcanoes, concluding that the comparatively greater thermal demagnetization at Syrtis Major compared with Tyrrhena Patera is likely due to a higher ratio of intruded to extruded magmas. The second uses the map along with topographic data to compare the magnetic signatures and crater retention ages of the demagnetized Hellas impact basin and magnetized Ladon impact basin. From this comparison, we determine that the martian global dynamo magnetic field went from substantial to very weak or nonexistent in the absolute model age time interval 4.15 ± 0.05 to 4.07 ± 0.05 Ga ago.
Microsoft Academic Graph classification: Mars Exploration Program Impact crater Martian Dynamo Magnetometer law.invention law Thermosphere Patera biology.organism_classification biology Geophysics Pitch angle Remote sensing Geology
Space and Planetary Science, Astronomy and Astrophysics
Space and Planetary Science, Astronomy and Astrophysics
Microsoft Academic Graph classification: Mars Exploration Program Impact crater Martian Dynamo Magnetometer law.invention law Thermosphere Patera biology.organism_classification biology Geophysics Pitch angle Remote sensing Geology
- Planetary Science Institute United States
- Goddard Space Flight Center United States
- University of Michigan–Flint United States
- Planetary Science Institute United States
- Goddard Space Flight Center United States
- University of Michigan–Flint United States
Abstract We apply improved kinetic modeling of electron transport in the martian thermosphere to fit pitch angle distributions measured by the Mars Global Surveyor (MGS) Magnetometer/Electron Reflectometer (MAG/ER), together with appropriate filtering, binning, averaging and error correction techniques, to create the most reliable ER global map to date of crustal magnetic field magnitude at 185 km altitude, with twice the spatial resolution and considerably higher sensitivity to crustal fields than global maps of magnetic field components produced with MAG data alone. This map compares favorably to sparsely sampled dayside MAG data taken at similar altitudes, insofar as a direct comparison is meaningful. Using this map, we present two case studies. The first compares the magnetic signatures of two highland volcanoes, concluding that the comparatively greater thermal demagnetization at Syrtis Major compared with Tyrrhena Patera is likely due to a higher ratio of intruded to extruded magmas. The second uses the map along with topographic data to compare the magnetic signatures and crater retention ages of the demagnetized Hellas impact basin and magnetized Ladon impact basin. From this comparison, we determine that the martian global dynamo magnetic field went from substantial to very weak or nonexistent in the absolute model age time interval 4.15 ± 0.05 to 4.07 ± 0.05 Ga ago.