Geomagnetic Micropulsations

Mid-latitude Vertical Transmission of Geomagnetic Micropulsations through the Ionosphere

A simple oblique dip model for geomagnetic micropulsations

It is pointed out that simple models adopted so far have tended to neglect the obliquity of the magnetic ®eld lines entering the Earth's surface. A simple alternative model is presented, in which the ambient ®eld lines are straight, but enter wedge shaped boundaries at half a right-angle. The model is illustrated by assuming an axially symmetric, compressional, impulse type disturbance at the o...

Contributions to geomagnetic theory

Acknowledgements The number o f in d iv id u a ls and o rg an iz atio n s who c o n trib u te d to th e work d escrib ed in t h i s paper i s so la rg e th a t some must accep t the a u th o r's thanks w ithout s p e c ific mention h e re. He must, however, e s p e c ia lly thank Dr. S ta te U n iv ersity o f Iowa, f o r suggesting the to p ic d iscu ssed in th e second p a r t of th e paper, f...

The geomagnetic power spectrum

S U M M A R Y Combining CHAMP satellite magnetic measurements with aeromagnetic and marine magnetic data, the global geomagnetic field has now been modelled to spherical harmonic degree 720. An important tool in field modelling is the geomagnetic power spectrum. It allows the comparison of field models estimated from different data sets and can be used to identify noise levels and systematic er...

Modelling Geomagnetic Activity Data

Strong geomagnetic activity is a hazard to electronics and electric power facilities. Assessment of the actual geomagnetic activity level from local magnetometer monitoring therefore is of importance for risk assessment but also in earth sciences and exploration. Wavelet based signal processing methods are applied to extract meaningful information from magnetic field time series in a noisy envi...