Daily geomagnetic variations on the Iberian Peninsula

Cueto, M.; McKnight, Don; Herráiz, M.

doi:10.1046/j.1365-246x.2003.01826.x

Cited by 16 publications

(20 citation statements)

References 18 publications

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“…To estimate the SV at the individual sites, we used the time-independent relation, which resulted from the Hungarian repeat station measurements at 2003.5 and 2006.5 (Kovács P., ELGI, personal communication, 2007: Table 1. The mean, maximal and minimal absolute errors for observatories are also given.…”

Section: D a T A A N A L Y S I Smentioning

confidence: 99%

“…Let us mention that the first day was geomagnetically the quietest (Kp ≤ 1) and the third one the most active day (Kp ≤ 5). Nevertheless, there are two difficulties regarding the above mentioned assumption: 1) the site is some 25 km from the coast of the Adriatic Sea and the daily variations are probably under the influence of the magnetic fields produced by the induced currents in the sea (Cueto et al, 2003); 2) the ground composition and underlying layers are quite different for that site and for the investigated area. These facts can be responsible for the different induced effects of the short-term geomagnetic variations.…”

Section: Fig 2 Leftmentioning

confidence: 99%

“…These variations arise from ionospheric and magnetospheric currents, and depend on the geographical position, seasons, solar activity, etc. (Riddihough, 1971;Campbell, 1989;Newitt et al, 1996;Torta et al, 1997;Cueto et al, 2003;Mandea and Purucker, 2005;Wardinski and Mandea, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Detailed analysis of the geomagnetic ground survey performed in middle-northern Croatia over the time interval 2003–2005

et al. 2009

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During the time interval 2003−2005 a ground survey of the total magnetic field intensity in the middle-northern part of Croatia was performed, in order to get a detailed insight of the field distribution over the region. A special effort was done to understand the uncertainty and errors in data reduction, namely different amplitudes of the diurnal variations and different secular variations at the ground stations with respect to the observatories. For data reduction to epoch 2004.5 the total field recordings from AQU, FUR, NCK and THY geomagnetic observatories have been used. We estimate the mean determination error to be one order of magnitude smaller than the maximal reduction error. Multiple linear regression and the method of empirical orthogonal functions were applied on the ground survey and observatory time series. This allowed us to explain the correlations among them and the variance of the total field. Furthermore, we identified two sources of serious artificial disturbances caused by DC leakage: the tramway system of the capital and one railway station in neighbouring Slovenia. Also, we estimate the region free of these disturbances. The magnitude of one of them is estimated to be more than five nT at the distance of about 10 km.

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Section: D a T A A N A L Y S I Smentioning

confidence: 99%

Section: Fig 2 Leftmentioning

confidence: 99%

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Detailed analysis of the geomagnetic ground survey performed in middle-northern Croatia over the time interval 2003–2005

et al. 2009

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“…Many researchers have been studying to understand the effect of such variations more precisely. Cueto et al (2003) conducted a similar study for the observatories on the Iberian Peninsula. Malin (1970) separated the lunar geomagnetic variations into the parts of ionospheric and oceanic origin.…”

Section: Introductionmentioning

confidence: 99%

Solar and lunar geomagnetic variations in the northwestern part of Turkey

Çelik

Tunçer

Tolak-Ciftci

et al. 2012

Geophysical Journal International

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SUMMARY Hourly mean values of X, Y and Z components of the geomagnetic field from two observatories and the total intensity, F, of the geomagnetic field from eight monitoring stations were analysed to study the behaviour of solar and lunar geomagnetic variations in the northwestern part of Turkey. The Chapman–Miller method was applied to the data first as a whole and then by grouping it to Lloyd's seasons to calculate seasonal dependence of the harmonics. Amplitudes of solar and lunar harmonics increase from winter months to summer months. The first two harmonics of both solar and lunar origins were calculated annually to compare with sunspot relative numbers to see annual and semi‐annual variation. The solar harmonics show very good sunspot dependence, but lunar harmonics do not. It means that both ionospheric and ring current systems have an important role in the formation of solar harmonics, but lunar harmonics are affected by ionospheric current system only in the northwestern part of Turkey. We would not expect and we do not find much ocean effect at these observatories since they are all remote from oceans with significant tides.

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“…External variations of the geomagnetic field are present on the time scales that range from parts of a second to the solar cycle, and they depend e.g. on the solar activity and season (Jankowski and Sucksdorff, 1996;De Santis et al, 1997;Cueto et al, 2003;Mandea and Purucker, 2005;Verbanac and Korte, 2006;Olsen and Mandea, 2007;. Stud.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Croatian geomagnetic repeat station surveys in 2004 and 2007

2011

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Surveys of the geomagnetic declination, inclination and total field intensitywere carried out at eight stations of the Croatian Geomagnetic Repeat Stations Network in 2004 and 2007. The total field time series at repeat stations and observatories were compared by use of the multi-linear regression and linear correlation coefficients. The surveys' data were reduced to 2004.5 and 2007.5 epochs by a simple method proposed here, assuming the secular variations at the repeat station and observatory are equal or different, respectively. These reductions, obtained in reference to L'Aquila, Fürstenfeldbruck and Tihany observatories, and corresponding weighted as well as nonweighted averages, were compared. The preferred geomagnetic field elements as well as the corresponding annual changes between 2004.5 and 2007.5 epochs, were compared to the latest International Geomagnetic Reference Field. Additionally, the Croatian Geomagnetic Normal Reference Fields for 2004.5 and 2007.5 epochs were presented.

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Daily geomagnetic variations on the Iberian Peninsula

Cited by 16 publications

References 18 publications

Detailed analysis of the geomagnetic ground survey performed in middle-northern Croatia over the time interval 2003–2005

Detailed analysis of the geomagnetic ground survey performed in middle-northern Croatia over the time interval 2003–2005

Solar and lunar geomagnetic variations in the northwestern part of Turkey

Analysis of Croatian geomagnetic repeat station surveys in 2004 and 2007

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