水星反馈发电机的初始时间演化
The initial temporal evolution of a feedback dynamo for Mercury
摘要：
目前正在讨论各种可能性来解释观测到的水星固有磁场的弱点。一种可能的发电机场景是一个发电机与磁层的反馈。由于水星的磁场很弱，它的磁层很小，太阳下的磁层顶距离只有1.7赫敏半径。我们考虑发电机区磁层顶电流产生的磁场。由于起源于磁层的外场与发电机场的偶极分量反平行，因此产生负反馈。对于一个α-ω-发电机，这样一个反馈发电机的两个稳态解出现了，一个是弱磁场，另一个是强磁场。然而，问题是如何实现这些解决方案。为了解决这个问题，我们讨论了一个简单的发电机模型的各种情况下，可以达到一个稳定的弱磁场的条件。我们发现，反馈机制淬灭的整体字段约100至150 nT的低值，如果发电机不驱动太强。
英文摘要：
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 alpha-omega-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 to 150 nT if the dynamo is not driven too strongly.
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