TY - BOOK AU - Holmberg,E.R.R. TI - A discussion of the origin of rapid periodic fluctuactions of the geomagnetic field and new analysis of observational material U1 - T/550/H71 21 KW - GEOMAGNETISMO KW - GEOFÍSICA KW - ELECTROMAGNETISMO KW - CIENCIAS DE LA TIERRA N1 - Incluye referencias bibliográficas; Chapter 1. Introduction -- Chapter 2. Historical Survey -- Chapter 3. Induction loop recordings at Eskdalmeuir 1926-1927 -- Chapter 4. Rapid run magnetometer recordings made in the Polar year 1932-33 -- Chapter 5. The seat of the Pulsations - a new analysis of the evidence -- Chapter 6. Terrestrial pulsations - an examination of physical processes ER -