A comparative study of the Earth's magnetic and gravity fields
Abstract
The article contains a comprehensive summary of the results of investigations into the connections between magnetic and gravity fields of the Earth. It was shown more than 30 years ago by means of studies concerning long period variations of the permanent magnetic field of the Earth thet to the secular variation a wave of about 50 years period hsa been superimposed. The origin of the phenomenon should be found in the eccentricity of the inner core of the Earth bein similar to the eccentricity showing itself in the magnetic dipole. The more accurate expansions into series of the geoidal figure - carried out since the appearence of satellite observations - made it possible to study the problem from the gravity side too. Some ten years ago it was shown that the 6 big anomalies determining the geoid can be written as sums of two influences and the position of the two sources can be deduced from the characteristical points of the magnetic eccentricity. These similarities of the magnetic and gravity field of the Earth raise - of course - a lot of new problems /e.g. due to the shifting of eccentric dipole the gravity acceleraion observable on the Earth must show changes too/. Thus the study of connections between the two fields of force can not be regarded as being closed down in spite of many similarities detected as yet.
- Publication:
-
Publications of the Astronomy Department of the Eotvos Lorand University
- Pub Date:
- 1982
- Bibcode:
- 1982PADEU...6..119B