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Pregled bibliografske jedinice broj: 442799

Four decades of European geomagnetic secular variation and acceleration


Verbanac, Giuliana; Korte, Monika; Mandea, Mioara
Four decades of European geomagnetic secular variation and acceleration // Annals of geophysics, 52 (2009), 5; 487-503 (međunarodna recenzija, članak, znanstveni)


Naslov
Four decades of European geomagnetic secular variation and acceleration

Autori
Verbanac, Giuliana ; Korte, Monika ; Mandea, Mioara

Izvornik
Annals of geophysics (1593-5213) 52 (2009), 5; 487-503

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
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.

Izvorni jezik
Engleski

Znanstvena područja
Geologija



POVEZANOST RADA


Projekt / tema
119-1193086-1314 - Istraživanje geomagnetskog polja i nehomogenosti litosfere u području Hrvatske (Davorka Herak, )

Ustanove
Prirodoslovno-matematički fakultet, Zagreb

Autor s matičnim brojem:
Giuliana Verbanac, (255244)

Časopis indeksira:


  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus