An ionized hydrogen atom (that is, a free proton) is moving through the magnetic field of the Milky Way galaxy, at a location distant from any star. The kinetic energy of the proton is 5.60 keV, and it moves through a circular path having a radius of 0.0317 astronomical units. An astronomical unit (AU) equals the average radius of the Earth's orbit around the Sun, 1.50×1011 m. What is the strength of the galactic magnetic field in this region of space?