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Pregled bibliografske jedinice broj: 442799

Časopis

Autori: Verbanac, Giuliana; Korte, Monika; Mandea, Mioara
Naslov: Four decades of European geomagnetic secular variation and acceleration
( Four decades of European geomagnetic secular variation and acceleration )
Izvornik: Annals of geophysics (1593-5213) 52 (2009), 5; 487-503
Vrsta rada: članak
Ključne riječi: European secular variation; secular acceleration; geomagnetic jerks
( European secular variation; secular acceleration; geomagnetic jerks )
Sažetak:
Geomagnetic secular variation, the generally slow, continuous change in the core magnetic field, is characterized by occasional rapid variations known as geomagnetic jerks. Recent studies on magnetic data obtained by satellites with a good global coverage suggest that more rapid and smaller scale features than previously thought occur in the field change. We have taken advantage of the comparatively high density of geomagnetic observatories in Europe and have derived a regional model for the detailed study of secular variation and acceleration over the past four decades from 1960 to 2001 by means of improved and regularized spherical cap harmonic analysis. We show the improvements to our regional model over a global model. All the known jerks are seen in our model, but further times with rapid changes in secular variation exist. Moreover, times of zero acceleration in general do not occur simultaneously in all magnetic field components, although this nearly is the case in 1969.6 and 1982.2. Secular variation and acceleration show very dynamic patterns indicating rapid and complex causal processes in the Earth's fluid core.
Projekt / tema: 119-1193086-1314
Izvorni jezik: eng
Rad je indeksiran u
bazama podataka:
Scopus
SCI-EXP, SSCI i/ili A&HCI
Science Citation Index Expanded (SCI-EXP) (sastavni dio Web of Science Core Collectiona)
Kategorija: Znanstveni
Znanstvena područja:
Geologija
URL Internet adrese: http://www.annalsofgeophysics.eu/index.php/annals/article/view/4605/4673
http://www.annalsofgeophysics.eu/index.php/annals/article/view/4605
URL cjelovitog teksta:
Google Scholar: Four decades of European geomagnetic secular variation and acceleration
Upisao u CROSBI: eugvujic@geolpmf.hr (eugvujic@geolpmf.hr), 2. Vel. 2010. u 17:09 sati



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