By Prof. Frederick W. Menk, Prof. Colin L. Waters(auth.)
This publication offers a complete account of magnetoseismology - the instrument to observe area weather. Written by way of researcher at the leading edge of this box, it conveys the physics in the back of the phenomena and the how to observe and examine them, the relevance to conversation, strength offer and plenty of different serious systems. additionally, it offers computational codes for research and overview.
Chapter 1 creation (pages 1–12):
Chapter 2 The Magnetosphere and Ionosphere (pages 13–43):
Chapter three ULF Plasma Waves within the Magnetosphere (pages 45–61):
Chapter four resources of ULF Waves (pages 63–86):
Chapter five strategies for Detecting box Line Resonances (pages 87–105):
Chapter 6 Ground?Based distant Sensing of the Magnetosphere (pages 107–132):
Chapter 7 house climate purposes (pages 133–161):
Chapter eight ULF Waves within the Ionosphere (pages 163–193):
Chapter nine Magnetoseismology at different Planets and Stars (pages 195–205):
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Extra info for Magnetoseismology: Ground-Based Remote Sensing of Earth's Magnetosphere
The crustal ﬁeld arises from relatively small-scale sources of induced or remnant magnetization of rock and may signiﬁcantly affect local magnetic measurements. This ﬁeld varies widely with location and is mapped with ground-based, marine, aeromagnetic, and high-precision satellite surveys. Such surveys provide vital information to the geophysics exploration community that is concerned with locating and exploiting mineral deposits. The disturbance ﬁeld due to external sources varies with location and time and is of particular interest.
2005; Tu and Marsch, 1995). A correlation often exists between magnetic ﬁeld and velocity ﬂuctuations. If the perturbed magnetic ﬁeld b ¼ dB is related to the velocity perturbation v ¼ dV and number density r in the form pﬃﬃﬃﬃﬃﬃﬃﬃ b ¼ Æv m0 r; ð1:3Þ then the perturbation is said to be Alfvenic and may be related to the propagation of transverse Alfven plasma waves. These waves are described in detail in Chapter 3. High-speed solar wind streams contain a complex spectrum of wave-like oscillations in velocity, density, and magnetic ﬁeld strength, with periods ranging from seconds to days (Gurnett, 2001), while large-amplitude, nonsinusoidal Alfven waves that probably originate in coronal holes and propagate outward from the Sun dominate the microscale structure of the solar wind (Belcher and Davis, 1971).
The precise frequencies vary with solar cycle. 4 (a) Time series and (b) power spectrum of the IMF north–south component magnitude measured upstream of Earth by the WIND spacecraft during April 1997. 14 mHz. Error bars denote 99% confidence intervals. (c) Power spectrum of proton density from upstream ACE spacecraft during March 2003. (d) Power spectrum of solar wind velocity from ACE spacecraft during June 1999. are believed to play an important role in heating the corona, and 5 min waves have been observed in the photosphere.