Journal
GEOPHYSICAL AND ASTROPHYSICAL FLUID DYNAMICS
Volume 104, Issue 4, Pages 419-429Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/03091921003776839
Keywords
Mercury; Magnetic field; Dynamo; Magnetosphere
Funding
- German Ministerium fur Wirtschaft und Technologie
- German Zentrum fur Luft- und Raumfahrt [50 QW 0602]
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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 -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.
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