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Space Observations to Determine the Location of Locally Vertical Geomagnetic Field

Published online by Cambridge University Press:  24 July 2018

Stefania Lepidi
Affiliation:
Istituto Nazionale di Geofisica e Vulcanologia, Roma, Italy
Domenico Di Mauro
Affiliation:
Istituto Nazionale di Geofisica e Vulcanologia, Roma, Italy
Roberta Tozzi
Affiliation:
Istituto Nazionale di Geofisica e Vulcanologia, Roma, Italy
Lili Cafarella
Affiliation:
Istituto Nazionale di Geofisica e Vulcanologia, Roma, Italy
Paola De Michelis
Affiliation:
Istituto Nazionale di Geofisica e Vulcanologia, Roma, Italy
Martina Marzocchetti
Affiliation:
Istituto Nazionale di Geofisica e Vulcanologia, Roma, Italy
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Abstract

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The points where the horizontal component of the geomagnetic field vanishes are located in polar areas, far away from the geomagnetic (analytic) poles and the poles of rotation of the Earth and, differently from the geomagnetic poles, can be found experimentally with a magnetic survey to determine where the field is vertical. The experimental determination of the area where the total field is perfectly vertical, commonly known as dip pole, is not simple, due to the remoteness and harsh climatic conditions; another difficulty is related to the short term geomagnetic field variations, due to the interaction with the external solar wind, which causes the magnetospheric dynamics, particularly evident at high latitude, and as a consequence a displacement of the dip pole. Actually, the study of the dip pole displacements over short time scales can be an important tool for monitoring the magnetospheric dynamics at high latitude. In this study we present the updated location of the the dip poles, using data from the Swarm ESA’s constellation of satellites along their almost polar orbits. We also analyse the spatial shift of these areas during different seasons and interplanetary magnetic field orientations.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2018 

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