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Pilipenko, V. A.
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- PublicationRestrictedA case study of upstream wave transmission to the ground at polar and low latitudes(2012)
; ; ; ; ; ; ; ; ;In this study we analyzed a long-duration ULF wave event detected on 18–19 February 2005 by Cluster satellites, upstream of the nose of the bow shock. The availability of simultaneous data from Geotail satellite, located in the foreshock region close to the dawn flank of the bow shock, allowed us to make a comparison between the observations at the two different sites. The results can be explained in terms of local wave generation, depending on the orientation of the interplanetary magnetic field with respect to the local bow shock normal. In addition, simultaneous data from Polar satellite in the inner magnetosphere and from ground stations in the southern polar cap and at low latitude allowed us to investigate the transmission of the external waves through the magnetosphere up to the ground. The observations suggest different paths of transmission. Waves generated upstream of the bow shock nose directly transmit near the subsolar point, progressively propagate into the magnetosphere and, after conversion into field-guided Alfven modes, reach the ground at high and low latitudes; waves generated on the flanks of the bow shock do not affect the subsolar magnetosphere, and consequently, there is no propagation along the closed field lines at both high and low latitudes. On the other hand, near the geomagnetic pole, the occurrence of pulsations can be related to the transmission across the magnetopause flanks of upstream waves, anywhere generated, as they are convected downstream by the solar wind; the compressional waves do not propagate deeply into the tail lobes but can couple to Alfven-guided waves along the outermost field lines.143 5 - PublicationOpen AccessMagnetotelluric sounding of the crust and hydromagnetic monitoring of the magnetosphere with the use of ULF waves(1993)
; ; ;Pilipenko, V. A.; Institute of Earth Physics, Moscow, Russia ;Fedorov, E. N.; Institute of Earth Physics, Moscow, Russia; 107 551 - PublicationOpen AccessMagnetic effects due to earthquakes and underground explosions: a review(1997-03)
; ; ;Surkov, V. V.; Moscow Engineering Physics Institute, Moscow, Russia ;Pilipenko, V. A.; Institute of the Physics of the Earth, Moscow, Russia; The physical nature of quasi-static and transient anomalies in the geomagnetic field induced by underground explosions or earthquakes is reviewed. New theoretical results obtained recently and so far little known to general circles of geophysicists are presented. The physical nature of residual magnetic and electrotelluric fields at the explosion point are considered. The seismic waves from explosions or distant earthquakes are suggested to be used as a tool for the preliminary probing of the Earth's crust sensitivity to various seismo-electromagnetic effects. The use of magnetic induction effects for tsunami detection and for crust sounding is outlined. The nature of ULF magnetic impulses related with earthquakes is discussed.185 1959 - PublicationOpen AccessMulti-component ground-based observation of ULF waves: goals and methods(1998-04)
; ; ; ; ; ; ;Pilipenko, V. A.; Institute of the Earth Physics, Moscow, Russia ;Vellante, M.; Dipartimento di Fisica, Università dell'Aquila, Italy ;Anisimov, S.; Institute of the Earth Physics, Moscow, Russia ;De Lauretis, M.; Dipartimento di Fisica, Università dell'Aquila, Italy ;Fedorov, E. N.; Institute of the Earth Physics, Moscow, Russia ;Villante, U.; Dipartimento di Fisica, Università dell'Aquila, Italy; ; ; ; ; A revival of the combined magnetic and telluric electric measurements at magnetic observatories is suggested.A number of problems, where such observations might be very helpful, are outlined: 1) the account for the resonance structure of the ULF field during the magnetotelluric probing of low-conductive geoelectrical structures; 2) the hydromagnetic diagnostics of the magnetospheric plasma distribution; 3) the discrimination of ionospheric and seismic contributions in anomalous ULF signals possibly related with earthquakes. The experimental apparatus for telluric current measurements, which has recently been installed at the observatories of Borok (Russia) and L'Aquila (Italy), is described.197 502 - PublicationRestrictedTwo-dimensional structure of long-period pulsations at polar latitudes in Antarctica(2004)
; ; ; ; ; ; ; ;Yagova, N.; Institute of the Physics of the Earth, Moscow, Russia ;Pilipenko, V.; Institute of the Physics of the Earth, Moscow, Russia ;Lanzerotti, L.; Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey, USA ;Engebretson, M.; Department of Physics, Augsburg College, Minneapolis, Minnesota, USA ;Rodger, A.; British Antarctic Survey, Cambridge, UK ;Lepidi, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Papitashvili, V.; University of Michigan, Ann Arbor, Michigan, USA; ; ; ; ; ; Two-dimensional (2-D) statistical distributions of spectral power and coherence of polar geomagnetic variations with quasi-periods about 10 min are analyzed using data from magnetometer arrays in Antarctica. Examination of the 2-D patterns of spectral power and coherence shows the occurrence of significant variations in geomagnetic power levels but with low spatial coherence near the cusp projection and in the auroral region. At the same time, low-amplitude pulsations, which we coin Picap3 pulsations, are very coherent throughout the polar cap. The region occupied by coherent Picap3 pulsations is shifted toward local MLT night from the geomagnetic pole and is decoupled from the regions of auroral and cusp ULF activity. The spectral power varies with time at polar latitudes in a manner different from that at auroral latitudes. Diurnal variations of power at different stations at the same geomagnetic latitude exhibit different behavior depending on the station’s position relative to geomagnetic and geographic poles. This asymmetry is shown to be partly attributed to the variations of the ionospheric conductance. The primary source of polar pulsations is probably related to intermittent magnetosheath turbulence and tail lobe oscillations, though a particular propagation mechanism has not as yet been identified274 88