Recent studies in micropulsation theory

@article{Southwood1974RecentSI,
  title={Recent studies in micropulsation theory},
  author={David J. Southwood},
  journal={Space Science Reviews},
  year={1974},
  volume={16},
  pages={413-425}
}
  • D. Southwood
  • Published 1 September 1974
  • Physics
  • Space Science Reviews
Three recent studies in the theory of micropulsations are described. Attention is given to the behaviour of the signal below the magnetosphere in the ionosphere and atmosphere, to the field line resonance problem and to hot plasma effects on magnetospheric hydromagnetic waves. In each case recent relevant observations are discussed. 

Comments on Field Line Resonances and Micropulsations

Summary Features and limitations of a simple plasma model exhibiting hydro-magnetic transverse mode field line resonances are discussed in relation to geomagnetic micropulsations.

Dispersion relation for magnetosonic waves within the upper atmospheric plasma

The dispersion relation for magnetosonic waves within the upper atmospheric plasma has been derived. The result can be used to study the variation of the longitudinal and transverse component of

Research in magnetospheric wave phenomena

During the last 4 years a number of developments have occurred which have led to an increased understanding of the role of wave phenomena in the physical processes of the magnetosphere. While the

Problems of the physics of geoelectromagnetic waves (a review)

Relevant tasks, disputable issues, and unsettled problems of the physics of ultralow-frequency electromagnetic waves of natural origin (a period range of 0.2–600 s) are discussed in the paper. Waves

Relationships of the characteristics of magnetohydrodynamic waves to plasma density gradients in the vicinity of the plasmapause

Top side electron density data obtained during the hours of ∼2100–2400 LT from the ionosphere sounder on the Isis 2 satellite are used to give indications of possible latitude gradients in the

REVIEWS OF TOPICAL PROBLEMS: Ultra-low-frequency electromagnetic waves in the Earth's crust and magnetosphere

Research on natural intra- and extraterrestrially produced electromagnetic waves with periods ranging from 0.2 to 600 s is reviewed. The way in which the energy of rock movements transforms into the

References

SHOWING 1-10 OF 17 REFERENCES

Effect of atmosphere and ionosphere on magnetospheric micropulsation signals

THE large-scale structure of low frequency hydromagnetic waves in the magnetospheric plasma can be understood from observations of micropulsations at the Earth's surface. Signals have to penetrate

The Effect of Two Periodic Conductivity Anomalies on Geomagnetic Micropulsation Measurements

Summary The effect of induced magnetic fields on the Earth based measurement of micropulsations is examined by means of two simple two-dimensional models, one with six and the other four variable

Effect of geoelectric structure on the polarization characteristics of the geomagnetic micropulsations

The amplitude and phase changes of the magnetic-field component normal to the strike of a geoelectric inhomogeneity are computed. The effects of the geoelectric inhomogeneity on the polarization

Drift Mirror Instability in the Magnetosphere

A new theory of the mirror instability is developed which includes the effects of ∇B and ∇n, finite Larmor radius, and a coexisting cold plasma. It is shown that the instability becomes overstable

Ultra low frequency waves in the magnetosphere

The behaviour of continuous pulsations pc 2–5 observed on the ground has been known for some time, and almost circularly polarised waves are predicted confirming an earlier heuristic suggestion.

Resonant vibration of the magnetosphere observed from Explorer 26

This paper examines in detail a set of large-amplitude pulsations in magnetic-field magnitude and proton fluxes (E > 98 kev) observed by Explorer 26 in connection with a bay event during the magnetic

A theory of long period magnetic pulsations 1

A theory of long-period (Pc 3 to Pc 5) magnetic pulsations is presented based on the idea of a steady state oscillation of a resonant local field line that is excited by a monochromatic surface wave

Latitude‐dependent characteristics of long‐period geomagnetic micropulsations

In summer 1969 a line of 7 magnetic stations was set up in western Canada between the geomagnetic latitudes of 59° and 77°N and within ∼2° of 302°E corrected geomagnetic longitude. This paper

Standing Alfvén waves in the magnetosphere

Transverse, low-frequency oscillations in the magnetic field have been recorded in the equatorial plane at 6.6 RE (earth radii) with the UCLA magnetometer on board ATS 1. The oscillations have