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We investigate the dynamical condensation process in a magnetized thermallybistable medium. We perform one-dimensional two fluid numerical simulationsthat describe the neutral and ionized components in the interstellar mediumwith purely transverse magnetic fields. We find that the clouds that are formedas a consequence of the thermal instability always have a magnetic fieldstrength on the order of a few microgauss irrespective of the initial strength.This shows good agreement with the measurements of the magnetic field strengthin diffuse clouds. We show analytically that the final magnetic field strengthin the clouds is determined by the balance between ambipolar diffusion and theaccumulation of the magnetic field due to condensation.Comment: 4 pages, 4 figures, accepted for publication in the ApJ

The Role of Ambipolar Diffusion in the Formation Process of Moderately Magnetized Diffuse Clouds