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Castillo, Yvelice Soraya; Pais, Maria Alexandra; Ribeiro, Paulo; Fernandes, João; Morozova, Anna L; Pinheiro, Fernando J G (2017): Hourly values of X, Y and Z geomagnetic components recorded at Coimbra Station (IAGA code: COI) and local geomagnetic K indices for 2007 to 2014 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.863008, Supplement to: Castillo, Yvelice Soraya; Pais, Maria Alexandra; Fernandes, João; Ribeiro, Paulo; Morozova, Anna L; Pinheiro, Fernando J G (2017): Geomagnetic activity at Northern Hemisphere's mid-latitude ground stations: How much can be explained using TS05 model. Journal of Atmospheric and Solar-Terrestrial Physics, 165-166, 38-53, https://doi.org/10.1016/j.jastp.2017.11.002

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Abstract:
For the 2007 to 2014 period, we use a statistical approach to evaluate the performance of Tsyganenko and Sitnov [2005, doi:10.1029/2004JA010798] semi-empirical model (TS05) in estimating the magnetospheric transient signal observed at four Northern Hemisphere mid-latitude ground stations: Coimbra, Portugal; Panagyurishte, Bulgary; Novosibirsk, Russia and Boulder, USA. We find that the TS05 performance is clearly better for the X (North-South) than for the Y (East-West) field components and for more geomagnetically active days as determined by local K-indices. For ~ 50% (X) and ~ 30% (Y) of the total number of geomagnetically active days, correlation values yield r > 0.7. During more quiet conditions, only ~30% (X) and ~15% (Y) of the number of analysed days yield r > 0.7. We compute separate contributions from different magnetospheric currents to data time variability and to signal magnitude. During more active days, all Tail, Symmetric Ring and Partial Ring currents contribute to the time variability of X while the Partial Ring and Field Aligned currents contribute most to the time variability of Y. The Tail and Symmetric Ring currents are main contributors to the magnitude of X. In the best case estimations when r > 0.7, remaining differences between observations and TS05 predictions could be explained by global induction in the Earth's upper layers and crustal magnetization. The closing of Field Aligned currents through the Earth's center in the TS05 model seems to be mainly affecting the Y magnetospheric field predictions.
Coverage:
Latitude: 40.222663 * Longitude: -8.417833
Date/Time Start: 2007-01-01T00:00:00 * Date/Time End: 2014-12-31T23:30:00
Comment:
The Coimbra data was obtained according to the standard procedures of a magnetic observatory and using the following instruments: (1) a DI-flux magnetometer (consisting of a fluxgate sensor MAG-01H mounted on MG2KP steel-free theodolite) and (2) a proton type magnetometer (the Overhauser GSM90-F1), for the absolute measurements (baseline control performed on weekly basis) of D & I and F, respectively; and (3) a digital variometer (model FGE, version J) for the continuous recording (with sampling rate of 1 Hz) of magnetic variations of components H, D and Z. The hourly series of XYZ were obtained from HZD series of 1-minute resolution.
Local K index consist of an integer in the range 0-9, which measures in a quasi-logarithmically way the maximum fluctuations of horizontal components of earth's magnetic field observed on a magnetometer during a three-hour interval (relative to an assumed quiet-day curve). Person responsible for Coimbra station geomagnetic data: Paulo Ribeiro (pribeiro@ci.uc.pt).
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
16 datasets

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Datasets listed in this publication series

  1. Castillo, YS; Pais, MA; Ribeiro, P et al. (2017): Hourly values of X, Y and Z geomagnetic components recorded at station COI in 2007. https://doi.org/10.1594/PANGAEA.863000
  2. Castillo, YS; Pais, MA; Ribeiro, P et al. (2017): Hourly values of X, Y and Z geomagnetic components recorded at station COI in 2008. https://doi.org/10.1594/PANGAEA.863001
  3. Castillo, YS; Pais, MA; Ribeiro, P et al. (2017): Hourly values of X, Y and Z geomagnetic components recorded at station COI in 2009. https://doi.org/10.1594/PANGAEA.863002
  4. Castillo, YS; Pais, MA; Ribeiro, P et al. (2017): Hourly values of X, Y and Z geomagnetic components recorded at station COI in 2010. https://doi.org/10.1594/PANGAEA.863003
  5. Castillo, YS; Pais, MA; Ribeiro, P et al. (2017): Hourly values of X, Y and Z geomagnetic components recorded at station COI in 2011. https://doi.org/10.1594/PANGAEA.863004
  6. Castillo, YS; Pais, MA; Ribeiro, P et al. (2017): Hourly values of X, Y and Z geomagnetic components recorded at station COI in 2012. https://doi.org/10.1594/PANGAEA.863005
  7. Castillo, YS; Pais, MA; Ribeiro, P et al. (2017): Hourly values of X, Y and Z geomagnetic components recorded at station COI in 2013. https://doi.org/10.1594/PANGAEA.863006
  8. Castillo, YS; Pais, MA; Ribeiro, P et al. (2017): Hourly values of X, Y and Z geomagnetic components recorded at station COI in 2014. https://doi.org/10.1594/PANGAEA.863007
  9. Castillo, YS; Pais, MA; Ribeiro, P et al. (2017): Local geomagnetic K indices at station COI in 2007. https://doi.org/10.1594/PANGAEA.863108
  10. Castillo, YS; Pais, MA; Ribeiro, P et al. (2017): Local geomagnetic K indices at station COI in 2008. https://doi.org/10.1594/PANGAEA.863109
  11. Castillo, YS; Pais, MA; Ribeiro, P et al. (2017): Local geomagnetic K indices at station COI in 2009. https://doi.org/10.1594/PANGAEA.863110
  12. Castillo, YS; Pais, MA; Ribeiro, P et al. (2017): Local geomagnetic K indices at station COI in 2010. https://doi.org/10.1594/PANGAEA.863111
  13. Castillo, YS; Pais, MA; Ribeiro, P et al. (2017): Local geomagnetic K indices at station COI in 2011. https://doi.org/10.1594/PANGAEA.863112
  14. Castillo, YS; Pais, MA; Ribeiro, P et al. (2017): Local geomagnetic K indices at station COI in 2012. https://doi.org/10.1594/PANGAEA.863113
  15. Castillo, YS; Pais, MA; Ribeiro, P et al. (2017): Local geomagnetic K indices at station COI in 2013. https://doi.org/10.1594/PANGAEA.863114
  16. Castillo, YS; Pais, MA; Ribeiro, P et al. (2017): Local geomagnetic K indices at station COI in 2014. https://doi.org/10.1594/PANGAEA.863115