 A  Physics of the Earth's Interior
 B  Seismology

C  Geomagnetism
C113, C112, C111, C110, C109, C108, C107, C106, C105, C104, C103, C102, C101, C100, C99, C98, C97, C96, C95, C94, C93, C92, C91, C90, C89, C88, C87, C86, C85, C84, C83, C82, C81, C80, C79, C78, C77, C76, C75, C74, C73, C72, C71, C70, C69, C68, C67, C66, C65, C64
 D  Physics of the Atmosphere
 E  Hydrology

P  Polar Research

G  Numerical Methods in Geophysics
 M  Miscellanea
New Methods for Parameterization and Determination of Transfer Functions and Impulse Responses
Volume: 364
Series: C88
Solar radiation gives rise to the primary (external) electric current systems in the magnetosphere and ionosphere of the Earth. Within the Earth, which is a good conductor of electricity, the electromagnetic induction produces a secondary system of currents, dependent, among other things, on the conductivity distribution in the Earth's interior. The electromagnetic field observed at the Earth's surface originates from these two sources. We will consider here a simplified model, in which the Earth's surface is flat. Such an approximation is correct if we adopt a lower limit for the frequencies we consider.
MONOGRAPHIC VOLUME
CONTENTS
1. Introduction, ...5
2. Basic relationships, ...11
3. The classic method, ...27
4. Approximation of transfer function with splines in the frequency domain, ...31
5. Determination of transfer function in the time domain, ...39
Appendix A. Characteristics of time signals, ...45
Appendix B. Approximation by cubic splines, ...55
B.1 Natural cubic splines, ...55
B.2 "Infinite" spline, ...57
B.3 Approximation with splines, ...62
Appendix C. Regularization, ...67
Bibliography, ...77
Streszczenie, ...81