Long period geomagnetic field fluctuations at Terra Nova Bay (Antarctica)

Villante, U.; Lepidi, S.; Francia, P.; Meloni, A.; Palangio, P.

doi:10.1029/97gl01466

Cited by 22 publications

(20 citation statements)

References 20 publications

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“…Due to the Earth's rotation, Terra Nova Bay has a variable distance, through the day, from the cusp projection and is located inside the polar cap during the major part of the day. As a consequence, the ULF activity often shows a significant power enhancement (approximately of an order of magnitude in the Pc3 and Pc4 bands) around local magnetic noon, when the station approaches closed field lines (Villante et al, 2000a(Villante et al, , 2000b. On the other hand, the effects of the substorm occurrence might be expected in the midnight sector.…”

Section: Resultsmentioning

confidence: 99%

Some aspects of man-made contamination on ULF measurements

et al. 2004

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Abstract. An analysis of the man made contamination on ULF measurements in highly populated areas has been conducted at several suitably chosen sites in Western Europe. The experimental results show common characteristics at different stations with clear evidence for an additional working day contamination with respect to weekends. These effects more clearly emerge in the vertical component that is less influenced by natural signals. A similar analysis conducted at Terra Nova Bay does not reveal any clear evidence for man made disturbances on Antarctic measurements.

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Section: Resultsmentioning

confidence: 99%

Some aspects of man-made contamination on ULF measurements

et al. 2004

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“…To study the geomagnetic field daily variation in the Antarctic region we used the hourly mean values of the three magnetic field elements which completely describe the magnetic field vector recorded at Terra Nova Bay in Antarctica from 1995 to 1998 (Villante et al, 1997 At this geomagnetic observatory, three-axis flux gate magnetometers oriented in the reference system H DZ are installed. Consequently at TNB observatory, the magnetic field is measured in a coordinate system where the H component point towards magnetic north, the D component to magnetic east, and the Z component is orthogonal to both of them, pointing downward.…”

Section: Data Set and Methods Of Analysismentioning

confidence: 99%

On the terms of geomagnetic daily variation in Antarctica

2009

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Abstract. The target of this work is to investigate the nature of magnetic perturbations produced by ionospheric and magnetospheric currents as recorded at high-latitude geomagnetic stations. In particular, we investigate the effects of these currents on geomagnetic data recorded in Antarctica. To this purpose we apply a mathematical method, known as Natural Orthogonal Composition, to analyze the magnetic field disturbances along the three geomagnetic field components (X, Y and Z) recorded at Mario Zucchelli Station (IAGA code TNB; geographic coordinates: 74.7 • S, 164.1 • E) from 1995 to 1998. Using this type of analysis, we characterize the dominant modes of the geomagnetic field daily variability through a set of empirical orthogonal functions (EOFs). While such mathematically independent EOFs do not necessarily represent physically independent modes of variability, we find that some of them are actually related to well known current patterns located at high latitudes.

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“…For a discussion of the results obtained in the whole ULF band from TNB observations over the last several years the reader is referred to the review paper by Villante et al (1999b).…”

Section: Introductionmentioning

confidence: 99%

An analysis of Pc3 and Pc4 pulsations at Terra Nova Bay (Antarctica)

2000

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Abstract. We conducted a statistical analysis of the physical characteristics of the micropulsation activity (Pc3 and Pc4 range) detected, during the austral summer 1994±95, at Terra Nova Bay (Antarctica, corrected latitude 80.0°S), a station which is few degrees poleward of those where most of the Antarctic measurements in these frequency ranges have been performed. The emerging overview suggests that the correspondence between the pulsation power and the external parameters (solar wind speed, interplanetary magnetic ®eld magnitude and orientation) is signi®cantly stronger than at somewhat lower latitudes. The day-to-day power variability was found to be strictly related to the general level of the geomagnetic activity, and the power level sharply maximizes at local magnetic noon. In the Pc4 range peaks of correlation with the SW speed are found in the dawn and dusk sides of the Earth's magnetosphere and the daily variation of the polarization pattern is closely consistent with that found at auroral latitudes and at lower frequencies. In the Pc3 range the correlation coecient between the pulsation power and the SW speed has maximum values in the local morning, and the frequency of selected events reveals a strong IMF control during closed magnetospheric conditions. The local time dependence of the correlation coecient between the pulsation power and the cone angle reveals an additional control by the IMF orientation, which becomes more explicit around local noon.

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Long period geomagnetic field fluctuations at Terra Nova Bay (Antarctica)

Cited by 22 publications

References 20 publications

Some aspects of man-made contamination on ULF measurements

Some aspects of man-made contamination on ULF measurements

On the terms of geomagnetic daily variation in Antarctica

An analysis of Pc3 and Pc4 pulsations at Terra Nova Bay (Antarctica)

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