On Short-Period Magneto-Hydrodynamic Waves in the Ionosphere

Studies on Magneto-hydrodynamic Waves and Other Anisotropic Wave Motions

There are two separate but closely interwoven strands of argument in this paper; one mainly mathematical, and one mainly physical. The mathematical strand begins with a method of asymptotically evaluating Fourier integrals in many dimensions, for large values of their arguments. This is used to investigate partial differential equations in four variables, x, y, z and t , which are linear with c...

Propagating magneto-hydrodynamic waves in a cooling homogenous coronal plasma

Aims. We present an investigation into how the cooling of the background plasma influences the propagation of slow and fast MHD wave modes supported by an unbounded, homogenous plasma. Previous investigations have suggested that the cooling of the plasma and a reduction in density could lead to the damping of fast magneto-acoustic oscillations. We aim to investigate whether cooling of the backg...

Hydrodynamic models for the short-period, classicalCepheid, SU Cas

Short period fluctuations in the characteristics of wireless echoes from the ionosphere

A new experim ental techn ique is described for study ing th e d irectional an d po larization characteristics of wireless echoes. The m ethod m akes use of an o rd inary spaced fram e direction-finding system , com bined w ith a tw inchannel am plifier an d ca thode-ray tu b e , so th a t by observations of an ellipse on th e screen th e phases an d am plitudes of th e e.m .f.s in th e aerial ...

Short-period solar cycle signals in the ionosphere observed by FORMOSAT-3/COSMIC

[1] We analyze 2 years of the FORMOSAT-3/COSMIC GPS radio occultation data to study the response of the Earth’s ionosphere to the solar rotation (27-day) induced solar flux variations. Here we report electron density variations in the ionosphere ( 100–500 km) associated with the 27-day solar cycle. The peak-to-peak variation in electron density at low latitudes in the F2 region is about 10–10 e...