کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4742441 | 1641581 | 2008 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Scale variability in convection-driven MHD dynamos at low Ekman number
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فیزیک زمین (ژئو فیزیک)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Scale variability in convection-driven MHD dynamos at low Ekman number Scale variability in convection-driven MHD dynamos at low Ekman number](/preview/png/4742441.png)
چکیده انگلیسی
We have undertaken a numerical study of convection-driven MHD dynamos in a rapidly rotating spherical shell with the Ekman number, E , down to 2×10−62×10−6 and the magnetic Prandtl number, Pm , down to 0.2. We focus on the characteristic scales of the flow and the magnetic field. Smaller-scale convection vortices responsible for generating the magnetic field appear at lower Ekman numbers, while the scale of the magnetic field shows less variation compared with the flow. As a result, scale separation between the flow and the magnetic field occurs as the Ekman number is decreased. Scale separation helps dynamos to maintain the magnetic field at Pm<1Pm<1 through increase in the effective value of the magnetic Reynolds number.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics of the Earth and Planetary Interiors - Volume 167, Issues 3–4, April 2008, Pages 168–178
Journal: Physics of the Earth and Planetary Interiors - Volume 167, Issues 3–4, April 2008, Pages 168–178
نویسندگان
Futoshi Takahashi, Masaki Matsushima, Yoshimori Honkura,