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Pregled bibliografske jedinice broj: 775940

Magnetic observatories: biases over CHAMP satellite mission


Verbanac, Giuliana; Mandea, Mioara; Bandic, Mario; Subasic, Senad
Magnetic observatories: biases over CHAMP satellite mission // Solid Earth, 6 (2015), 775-781 doi:10.5194/se-6-775-2015 (međunarodna recenzija, članak, znanstveni)


Naslov
Magnetic observatories: biases over CHAMP satellite mission

Autori
Verbanac, Giuliana ; Mandea, Mioara ; Bandic, Mario ; Subasic, Senad

Izvornik
Solid Earth (1869-9510) 6 (2015); 775-781

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

Ključne riječi
Magnetic observatories; biases; external magnetic field; CHAMP satellite mission

Sažetak
Taking advantage of 9 years of the CHAMP (CHAllenging Minisatellite Payload) satellite mission (June 2000–August 2009), we investigate the temporal evolution of the observatory monthly magnetic biases. To determine these biases we compute X (northward), Y (eastward) and Z (vertically downward) monthly means from 42 observatory 1 min values or hourly values, and compare them to synthetic monthly means obtained from a G field model (Lesur et al., 2015). Afterwards, the average of biases at all observatories over 9 years is calculated and analyzed. Both the long-term trends and short-period variations (hereafter variations) around these averages are then investigated. The simple oscillatory pattern of , found at all observatories and in each component over the entire considered period, indicates that the crustal field has not changed. A comparison with both MAGSAT and Ørsted bi- ases given for epochs 1979.92 and 1999.92 which are based on 2 single months (November and December) of MAGSAT and Ørsted satellite data, respectively, further shows that the crustal field has probably remained constant over last 3 decades. The long-trend seen in reflects the changes within the solar cycle 23. The short period variations observed in the time series are related to the external field. The ampli- tudes of these variations are found to be in phase with solar cycle periods, being remarkably larger over 2000–2005 than 2006–2009. Furthermore, clear semi-annual variations are observed in , with larger extremes appearing mostly around October and November, and around May and June of each year in X, and vice versa in Y and Z. A common external field pattern is found for the European monthly biases. The dependence of the bias monthly variations on geomagnetic latitudes is not found for non-European observatories. The results from this study represent a base to further exploit the magnetic biases computed for observatories and repeat station locations together by using data from the new satellite mission Swarm.

Izvorni jezik
Engleski

Znanstvena područja
Geologija



POVEZANOST RADA


Ustanove
Prirodoslovno-matematički fakultet, Zagreb

Autor s matičnim brojem:
Giuliana Verbanac, (255244)

Časopis indeksira:


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


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