NirViaje
commented
6 years ago 
the magnetic field of the Earth
Earth's magnetic field, also known as the geomagnetic field, is the magnetic field that extends from the Earth's interior out into space, where it meets the solar wind, a stream of charged particles emanating from the Sun. Its magnitude at the Earth's surface ranges from 25 to 65 microteslas (0.25 to 0.65 gauss).[3]
Superconductor coil
- ~1km length
- how to avoid break during init on curved ground?
- cryogenic refrigerator
- heat pipe cool end
Ordinary conductor coil
AWG #9 for 300m round, 1000 turns, ~1k Ohm, 10A, ~10000A@100kW
- μ = 100mH/m
- S = (50m)^2
- length = 100m
- N = 1000
- I_current = 10
\Phi = 2.5E4 Wb
B = 10T? 无空气隙，闭合磁路
进一步应当作为真空偶极子计算
可能受目标星不规则几何结构导磁特性严重影响，需准周期主动调整/当心奇异点
purpose: