مقاله ای در باب مغناطیس ،تخصصی ، نویسنده : محمدرضا زهدی ، زبان انگلیسی

کتاب یا مقاله ای که قصد خرید ان را دارید نکات فوق العاده تخصصی درباره ی مغناطیس و میدان های مغناطیسی می باشد بخشی از چکیده کتاب و ترجمه ی آن به فارسی : We have said that the earth is a big magnet, so there is a magnetic property init, so one of the reasons for the appearance of magnets in geology is the magnetism of the earth. The Earth’s magnetic field is generated in the fluid outer core by a self-exciting dynamo process. Electrical currents flowing in the slowly moving molten iron generate the magnetic field. In addition to sources in the Earth’s core the magnetic field observable at the Earth’s surface has sources in the crust and in the ionosphere and magnetosphere. The geomagnetic field varieson a range of scales and a description of these variations is now made, in the order low frequency to high frequency variations, in both the space and time domains. The final section describes how the Earth’s magnetic field can be both a tool and a hazard to the modern world. First of all, h …