منابع مشابه
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...
متن کاملContributions 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...
متن کاملThe 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...
متن کاملModelling 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...
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ژورنال
عنوان ژورنال: Australian Journal of Physics
سال: 1962
ISSN: 0004-9506
DOI: 10.1071/ph620070