Hydromagnetism. II. A Review

The theoretical foundations having been given in Part I, phenomena here reviewed are: character and magnitude of the geomagnetic secular variation, the geomagnetic westward drift, hydromagnetic interpretation of irregularities in the earth's angular velocity; nature of fossil magnetism, magnetization of historical and prehistorical bricks and clays, of eruptive and sedimentary rocks, reversals of the earth's field in the geological past, evidence for pole migration; exploration of solar magnetic fields, the solar convection zone, magnetic fields of sunspots, the sunspot cycle, the over-all solar field, observations of magnetic stars, variable magnetic stars; fields in the solar corona, streamers and prominences, magnetic storms and auroras, planetary fields, the galactic field, the problem of cosmic rays.