Geophysik III / Geophysics III, 5 Teile

Sect. 14. 297 for such slow variations the effect described under 2. above will be by far the most predominant. In fact, the equipment provides a record of the time derivative of the element in question. 6) Records of the time derivatives of magnetic elements can, however, be obtained in a more direct way by recording directly the electromotive force (e. m. f. ) induced in suitably disposed coils by the variations of the geomagnetic field 10, 11. When a coil with the total winding area F is placed with its axis in the direction of a geomagnetic force component the variation of magnetic induction B with time will produce an electromotive force 1 dB 1 dH e=- coveu, uuFdT=- 'oV, uQf1oFdT (i). )) . !. . =_to-13 d(B/y) (1). )a) v em! d(tjs) in the coil. The e. mJ. may be amplified and recorded by means of an oscillograph or on a tape recorder. but more often the coil is used in connection with an ordinary galvanometer and the scale value of, for instance the dl1/dt record, will then - in the same way as the scale value of the magnet variometer treated in Subsect. IX - be dependent on the damping factor IX and on TO/T, where To and T are the oscillation periods for the undamped galvanometer and for the magnetic pulsation respectively. The amplitude recorded will be proportional to the amplification factor I, obtained from Eq. (1).

Produktdetails

• Mitarbeit: Kar Rawer (Herausgeber), Karl Rawer (Herausgeber)
• Verlag: Springer, Berlin
• Sprache: Englisch
• Produktform: Medienkombination
• Erschienen: 01.01.2014
• EAN: 9783642462795
• ISBN: 978-3-642-46279-5
• Seiten: 2464
• Illustration: XXXV, 2464 p. In 5 volumes, not available separately.
• Serien: Handbuch der Physik Encyclopedia of Physics / Geophysik / Geophysics; Handbuch der Physik Encyclopedia of Physics / Geophysik / Geophysics; Handbuch der Physik Encyclopedia of Physics; Geophysik / Geophysics
• Thema: Naturwissenschaften, Medizin, Informatik, Technik > Physik, Astronomie > Allgemeines, Lexika