Earth's magnetic field on its surface is 25 to 65 microtesla. Besides earth's atmospheric protection, majority of sun's harmful radiation on the earth is shielded by this small magnetic field. Such a small magnetic field can easily be produced by a permanent dipole magnet or a small current around the spacecrafts or space suits. Then why the space craft or space suites are not designed with magnetic fields?
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4$\begingroup$ Possible duplicate of Radiation shielding magnetic or mass, which is more efficient? or Research on mini-magnetospheres $\endgroup$ – Russell Borogove May 25 '17 at 3:35
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1$\begingroup$ Consider the size of the Earth's field, not just the strength. $\endgroup$ – uhoh May 25 '17 at 5:42
