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Consorzio Area di Ricerca in Astrogeofisica, L’Aquila, Italy
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- PublicationOpen AccessULF fluctuations of the geomagnetic field and ionospheric sounding measurements at low latitudes during the first CAWSES campaign(2006)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ;Villante, U.; Consorzio Area di Ricerca in Astrogeofisica, L’Aquila, Italy ;Vellante, M.; Consorzio Area di Ricerca in Astrogeofisica, L’Aquila, Italy ;Francia, P.; Consorzio Area di Ricerca in Astrogeofisica, L’Aquila, Italy ;Lauretis, M.; Consorzio Area di Ricerca in Astrogeofisica, L’Aquila, Italy ;Meloni, A.; Consorzio Area di Ricerca in Astrogeofisica, L’Aquila, Italy ;Palangio, P.; Consorzio Area di Ricerca in Astrogeofisica, L’Aquila, Italy ;Zolesi, B.; Consorzio Area di Ricerca in Astrogeofisica, L’Aquila, Italy ;Pezzopane, M.; Consorzio Area di Ricerca in Astrogeofisica, L’Aquila, Italy ;F¨orster, M.; GeoForschungsZentrum, Potsdam, Germany ;Zhang, T.; Space Research Institute, Austrian Academy of Sciences, Graz, Austria ;Magnes, W.; Space Research Institute, Austrian Academy of Sciences, Graz, Austria ;Nenovski, P.; Geophysical Institute, Bulgarian Academy of Science, Sofia, Bulgaria ;Cholakov, I.; Geophysical Institute, Bulgarian Academy of Science, Sofia, Bulgaria ;Wesztergom, V.; Geodetic and Geophysical Research Institute of the Hungarian Academy of Science, Sopron, Hungary; ; ; ; ; ; ; ; ; ; ; ;; We present an analysis of ULF geomagnetic field fluctuations at low latitudes during the first CAWSES campaign (29 March–3 April 2004). During the whole campaign, mainly in the prenoon sector, a moderate Pc3-4 pulsation activity is observed, clearly related to interplanetary upstream waves. On 3 April, in correspondence to the Earth’s arrival of a coronal mass ejection, two SIs are observed whose waveforms are indicative of a contribution of the high-latitude ionospheric currents to the low-latitude ground field. During the following geomagnetic storm, low frequency (Pc5) waves are observed at discrete frequencies. Their correspondence with the same frequencies detected in the radial components of the interplanetary magnetic field and solar wind speed suggests that Alfv´enic solar wind fluctuations may act as direct drivers of magnetospheric fluctuations. A cross-phase analysis, using different pairs of stations, is also presented for identifying field line resonant frequencies and monitoring changes in plasmaspheric mass density. Lastly, an analysis of ionospheric vertical soundings, measured at the Rome ionosonde station (41.8 N, 12.5 E), and vertical TEC measurements deduced from GPS signals within an European network shows the relation between the ULF resonances in the inner magnetosphere and thermal plasma density variations during geomagnetically quiet conditions, in contrast to various storm phases at the end of the CAWSES campaign.481 174 - PublicationRestrictedSome aspects of man-made contamination on ULF measurements(2004)
; ; ; ; ; ; ; ; ;Villante, U.; Dipartimento di Fisica, Università, L’Aquila, Italy - Consorzio Area di Ricerca in Astrogeofisica, L’Aquila, Italy ;Vellante, M.; Dipartimento di Fisica, Università, L’Aquila, Italy - Consorzio Area di Ricerca in Astrogeofisica, L’Aquila, Italy ;Piancatelli, A.; Dipartimento di Fisica, Università, L’Aquila, Italy - Consorzio Area di Ricerca in Astrogeofisica, L’Aquila, Italy ;Di Cienzo, A.; Consorzio Area di Ricerca in Astrogeofisica, L’Aquila, Italy ;Zhang, T. L.; Institut für Weltraumforschung, Graz, Austria ;Magnes, W.; Institut für Weltraumforschung, Graz, Austria ;Wesztergom, V.; Geodetic and Geophysical Research Institute of the Hungarian Academy of Science, Sopron, Hungary ;Meloni, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; ; ; ; ; ;; 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.240 80