000006277 001__ 6277
000006277 005__ 20230131144351.0
000006277 037__ $$aCTALK-2023-0032
000006277 100__ $$aRivoldini, Attilio
000006277 245__ $$aEffect of a thermally stratified layer in the outer core of Mercury on its internally generated magnetic field
000006277 260__ $$c2022
000006277 269__ $$c2022-09-19
000006277 500__ $$aEPSC2022-929
000006277 520__ $$aThe low intensity and lack of small-scale variations in Mercury’s present-day magnetic field can be explained by a thermally stratified layer blanketing the convective liquid outer core. The presence of a present-day stable layer is supported by thermal evolution studies that show that a sub-adiabatic heat flow at the core-mantle boundary can occur during a significant fraction of Mercury’s history. The requirements for both the likely long-lived Mercury dynamo and the presence of a stable layer place important constraints on the interior structure and evolution of the core and planet. We couple mantle and core thermal evolution to investigate the necessary conditions for a long-lived and present-day dynamo inside Mercury’s core by taking into account an evolving stable layer overlying the convecting outer core. Events such as the cessation of convection in the mantle may strongly influence the core-mantle boundary heat flow and affect the thickness of the thermally stratified layer in the core, highlight the importance of coupling mantle evolution with that of the core. We employ interior structure models that agree with geodesy observations and make use of recent equations of state to describe the thermodynamic properties of Mercury’s Fe-S-Si core for our thermal evolution calculations.
000006277 594__ $$aNO
000006277 700__ $$aDeprost , Marie-Hélène
000006277 700__ $$aZhao , Yue
000006277 700__ $$aKnibbe , Jurien
000006277 700__ $$aVan Hoolst, Tim
000006277 773__ $$t European Planetary Science Congress 2022, Granada, Spain
000006277 8560_ $$fattilio.rivoldini@observatoire.be
000006277 8564_ $$s3684851$$uhttp://publi2-as.oma.be/record/6277/files/Mercury thermal evolution.pdf
000006277 8564_ $$s12310$$uhttp://publi2-as.oma.be/record/6277/files/Mercury thermal evolution.jpg?subformat=icon-180$$xicon-180
000006277 8564_ $$s14841$$uhttp://publi2-as.oma.be/record/6277/files/Mercury thermal evolution.gif?subformat=icon$$xicon
000006277 906__ $$aContributed
000006277 980__ $$aCTALKCONT