Heyner, D. and Schmitt, J. and Wicht, K.-H. and Glassmeier, K.-H. and Korth, H. and Motschmann, U. (2010) The initial temporal evolution of a feedback dynamo for Mercury. Geophysical and Astrophysical Fluid Dynamics, 104 (4), pp. 419-429. Taylor & Francis. DOI: 10.1080/03091921003776839. ISSN 0309-1929.
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Various possibilities are currently under discussion to explain the observed weakness of the intrinsic magnetic field of planet Mercury. One of the possible dynamo scenarios is a dynamo with feedback from the magnetosphere. Due to its weak magnetic field, Mercury exhibits a small magnetosphere whose subsolar magnetopause distance is only about 1.7 Hermean radii. We consider the magnetic field due to magnetopause currents in the dynamo region. Since the external field of magnetospheric origin is antiparallel to the dipole component of the dynamo field, a negative feedback results. For an agrΩ-dynamo, two stationary solutions of such a feedback dynamo emerge: one with a weak and the other with a strong magnetic field. The question, however, is how these solutions can be realized. To address this problem, we discuss various scenarios for a simple dynamo model and the conditions under which a steady weak magnetic field can be reached. We find that the feedback mechanism quenches the overall field to a low value of about 100-150 nT if the dynamo is not driven too strongly.
|Title:||The initial temporal evolution of a feedback dynamo for Mercury|
|Journal or Publication Title:||Geophysical and Astrophysical Fluid Dynamics|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 419-429|
|Publisher:||Taylor & Francis|
|Keywords:||Mercury; Magnetic field; Dynamo; Magnetosphere|
|HGF - Research field:||Aeronautics, Space and Transport (old)|
|HGF - Program:||Space (old)|
|HGF - Program Themes:||W EW - Erforschung des Weltraums|
|DLR - Research area:||Space|
|DLR - Program:||W EW - Erforschung des Weltraums|
|DLR - Research theme (Project):||W - Vorhaben Planetenforschung (old)|
|Institutes and Institutions:||Institute of Planetary Research > Asteroids and Comets|
|Deposited By:||Laura-Maria Brumm|
|Deposited On:||20 Jan 2011 12:26|
|Last Modified:||04 Apr 2013 16:27|
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