Planetary Magnetic Dynamo Effect on Atmospheric Protection of Early Earth and Mars |
| |
| Authors: | V Dehant H Lammer Y N Kulikov J-M Grießmeier D Breuer O Verhoeven Ö Karatekin T Van Hoolst O Korablev P Lognonné |
| |
| Institution: | (1) Royal Observatory of Belgium, Brussel, Belgium;(2) Space Research Institute, Austrian Academy of Sciences, Graz, Austria;(3) Polar Geophysical Institute (PGI), Russian Academy of Sciences, Apatity, Russia;(4) Observatoire de Paris, Paris, France;(5) DLR, Berlin, Germany;(6) Space Research Institute, Moscow, Russia;(7) Institut de Physique du Globe de Paris, Paris, France |
| |
| Abstract: | In light of assessing the habitability of Mars, we examine the impact of the magnetic field on the atmosphere. When there
is a magnetic field, the atmosphere is protected from erosion by solar wind. The magnetic field ensures the maintenance of
a dense atmosphere, necessary for liquid water to exist on the surface of Mars. We also examine the impact of the rotation
of Mars on the magnetic field. When the magnetic field of Mars ceased to exist (about 4 Gyr ago), atmospheric escape induced
by solar wind began. We consider scenarios which could ultimately lead to a decrease of atmospheric pressure to the presently
observed value of 7 mbar: a much weaker early martian magnetic field, a late onset of the dynamo, and high erosion rates of
a denser early atmosphere. |
| |
| Keywords: | Habitability Rotation Magnetic field Atmospheric escape |
| 本文献已被 SpringerLink 等数据库收录！ |
|
