on polar daily geomagnetic variation

Clicks: 76
ID: 221108
2015
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Abstract

The aim of this work is to investigate the nature of the daily magnetic field perturbations produced by ionospheric and magnetospheric currents at high latitudes. We analyse the hourly means of the X and Y geomagnetic field components recorded by a meridian chain of permanent geomagnetic observatories in the polar region of the Northern Hemisphere during a period of four years (1995-1998) around the solar minimum. We apply a mathematical method, known as natural orthogonal component (NOC), which is capable of characterizing the dominant modes of the geomagnetic field daily variability through a set of empirical orthogonal functions (EOFs). Using the first two modes we reconstruct a two-dimensional equivalent current representation of the ionospheric electric currents, which contribute substantially to the geomagnetic daily variations. The obtained current structures resemble the equivalent current patterns of DP2 and DP1. We characterize these currents by studying their evolution with the geomagnetic activity level and by analysing their dependence on the interplanetary magnetic field. The obtained results support the idea of a coexistence of two main processes during all analysed period although one of them, the directly driven process, represents the dominant component of the geomagnetic daily variation.

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michelis2015annalson Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Paola De Michelis;Giuseppe Consolini
Journal desalination
Year 2015
DOI
10.4401/ag-6801
URL
http://www.annalsofgeophysics.eu/index.php/annals/article/view/6801
Keywords
cosmic physics climatologygeophysics

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