 |
| Titel |
Impact structures seen by magnetic anomaly maps |
| VerfasserIn |
Anca Isac, Mioara Mandea, Michael Purucker |
| Konferenz |
EGU General Assembly 2010
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250038493
|
|
|
|
|
|
| Zusammenfassung |
| The terrestrial planets are open systems and impacting was and it can be a very important
process for the planetary evolution. Earth has an active dynamo, however neither Moon
and Mars have an active one. The magnetized rocks in their crusts suggest that in
their earlier history, dynamos may have been operating in the metallic core of these
bodies. Because of its large iron core the possibility of an ancient operating Martian
dynamo is more likely, but the small lunar core and the age of the magnetized lunar
rocks, have brought in debate a possible dynamo origin of lunar magnetism. The
magnetic fields have been observed at global scale only for the Earth, Mars and
Moon, and very conspicuous magnetic anomalies have been estimated for these three
bodies. For this study, we firstly have used the largest impact structures for the
Earth, Mars and Moon. Thereafter, we have extended our work to smaller martian
and lunar impact craters (30 km diameters), cataloging them in order to obtain
information about the impact crater magnetic signatures, positions, shapes and
diameters. We superposed ULCN 2005 or Kaguya 2008 gridded topography on Lunar
Prospector magnetic map for Moon and Mars Orbiting Laser Altimeter (MOLA)
gridded data on Mars Global Surveyor magnetic data for Mars, as a systematic search
for Quasi-Circular Depressions. The results obtain for Mars and Moon, obtained
for a larger number of craters allow us to have a statistical view on the indicated
parameters. |
|
|
|
|
|
|