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On the Geomagnetic Field Line Resonance Eigenfrequency Variations during Seismic Event
2021
Remote Sensing
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We have analysed a large sample of earthquakes (EQ) using ground magnetometers data: in 28 of 42 analysed case events, we detect a temporary stepwise decrease (Δf) of the magnetospheric field line resonance ...
This finding supports a lithosphere-magnetosphere coupling mechanism producing a plasma density variation along the magnetic field lines, mechanically produced by atmospheric acoustic gravity waves (AGWs ...
Field Line Resonance Eigenfrequency Equation The external perturbation pressure δP AGW produced by the AGW, impinging on the ionospheric plasma from below, is able to modify the density field thus inducing ...
doi:10.3390/rs13142839
fatcat:x6zmbn2w2jfdjonwoiwiclzlxi
Magnetospheric–Ionospheric–Lithospheric Coupling Model. 1: Observations during the 5 August 2018 Bayan Earthquake
2020
Remote Sensing
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In this paper we analyze a scenario of the low latitude earthquake (Mw = 6.9) which occurred in Indonesia on 5 August 2018, through a multi-instrumental approach, using ground and satellites high quality ...
and at the moment of the earthquake occurrence. ...
In fact, the resonance frequencies of a geomagnetic field line, with both ends fixed in the ionosphere depend on the field line length, and on the magnetic field intensity and plasma mass density ρ along ...
doi:10.3390/rs12203299
fatcat:hxp4lg6biveohmnnpiyf7psez4
Influence of high-latitude geomagnetic pulsations on recordings of broadband force-balanced seismic sensors
2012
Geoscientific Instrumentation, Methods and Data Systems
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</strong> Seismic broadband sensors with electromagnetic feedback are sensitive to variations of surrounding magnetic field, including variations of geomagnetic field. ...
Usually, the influence of the geomagnetic field on recordings of such seismometers is ignored. It might be justified for seismic observations at middle and low latitudes. ...
This study was made within the International Polar Year 2007Year -2009. The seismic data of the Kilpisjärvi (KIF) station of the Institute of Seismology of the University of Helsinki was used. ...
doi:10.5194/gi-1-85-2012
fatcat:jmanvqegfvbtdo2nvknd57vi5u
Influence of high-latitude geomagnetic pulsations on recordings of broad-band force-balanced seismic sensors
2012
Geoscientific Instrumentation Methods and Data Systems Discussions
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Seismic broadband sensors with electromagnetic feedback are sensitive to variations of surrounding magnetic field, including variations of geomagnetic field. ...
Usually, the influence of the geomagnetic field on recordings of such seismometers is ignored. It might be justified for seismic observations at middle and low latitudes. ...
This study was made within the International Polar Year 2007Year -2009. The seismic data of the Kilpisjärvi (KIF) station of the Institute of Seismology of the University of Helsinki was used. ...
doi:10.5194/gid-2-107-2012
fatcat:qxvpy6kajvhptflo4fknlbypfm
A Review of Low Frequency Electromagnetic Wave Phenomena Related to Tropospheric-Ionospheric Coupling Mechanisms
2011
Space Science Reviews
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A note before proceeding: Depending on the field of research, different terminology is used to define the various electromagnetic frequency ranges. ...
They also estimate the lightning stroke distance to the receiver by assessing spectral lines relative intensity. ...
and variations in wave polarization due to the geomagnetic field. ...
doi:10.1007/s11214-011-9854-0
fatcat:75vzey66vbfvbgfu2nnx5crfwy
A Review of Low Frequency Electromagnetic Wave Phenomena Related to Tropospheric-Ionospheric Coupling Mechanisms
[chapter]
2011
Space Sciences Series of ISSI
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A note before proceeding: Depending on the field of research, different terminology is used to define the various electromagnetic frequency ranges. ...
They also estimate the lightning stroke distance to the receiver by assessing spectral lines relative intensity. ...
and variations in wave polarization due to the geomagnetic field. ...
doi:10.1007/978-1-4614-5677-3_20
fatcat:o4jzca65w5fijfeycf3iplu4da
Detection and modeling of Rayleigh wave induced patterns in the ionosphere
2011
Journal of Geophysical Research
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1] Global Positioning System (GPS) allows the detection of ionospheric disturbances associated with the vertical displacements of most of the major shallow seismic events. ...
After the description of the local geomagnetic field anisotropic effects, we show how the observation geometry is strongly affecting the radiation pattern. ...
We also acknowledge the GSI and M. Murakami for providing us with 1 Hz GPS data of the GEONET Japanese GPS network. ...
doi:10.1029/2010ja016060
fatcat:d362hl56hjfflarwn3u5welc4i
Statistical analysis of ground based magnetic field measurements with the field line resonance detector
2008
Annales Geophysicae
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</strong> In this paper we introduce the field line resonance detector (FLRD), a wave telescope technique which has been specially adapted to estimate the spectral energy density of field line resonance ...
The field line resonance detector is able to detect and correctly characterize several superposed FLR structures of a wave field and therefore constitutes a new and powerful tool in ULF pulsation studies ...
This work was financially supported by the German Ministerium für Wirtschaft und Technologie and the Deutsches Zentrum für Luft-und Raumfahrt under contract 50OC0103. ...
doi:10.5194/angeo-26-3477-2008
fatcat:lyueeangpnflvktaudl33w523m
Geomagnetic Activity at Lampedusa Island: Characterization and Comparison with the Other Italian Observatories, Also in Response to Space Weather Events
2021
Remote Sensing
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These latter studies lead us to search for possible signatures of magnetic field line resonances during intense space weather events, using cross-phase multi-observatory analysis, revealing the promising ...
We also study the geomagnetic individual response to intense space weather events by performing Superposed Epoch Analysis (SEA), with an ad-hoc significance test. ...
region for providing evidence of Field Line Resonance (FLR) events on Duronia-Lampedusa intermediate field line. ...
doi:10.3390/rs13163111
fatcat:xq5de37yfrbpnmbkgpznw77x5m
Sino-Magnetic Array at Low Latitudes (SMALL) including initial results from the sister sites in the United States
2000
Advances in Space Research
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It is shown that the coverage, high sensitivity, and accurate timing of the SMALL array will advance our understanding of low-latitude geomagnetic phenomena. 0 7000 COSPAR. ...
We present some initial results from the Beijing station as well as several U.S. sister sites using the same instrumentation. ...
The construction of the magnetometers for the San Gabriel Dam, Los Angeles, Colorado Springs and Boulder sites were supported by the Los Alamos National Laboratory branch of the Institute of Geophysics ...
doi:10.1016/s0273-1177(99)00643-2
fatcat:r7cnzfqwmjejrfhzcxutmy5t3m
Pre-Seismic Irregularities during the 2020 Samos (Greece) Earthquake (M = 6.9) as Investigated from Multi-Parameter Approach by Ground and Space-Based Techniques
2021
Atmosphere
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We present a comprehensive analysis of pre-seismic anomalies as computed from the ground and space-based techniques during the recent Samos earthquake in Greece on 30 October 2020, with a magnitude M = ...
We first eliminate the particle count rate (CR) due to possible geomagnetic storms and South Atlantic Anomaly (SAA) by the proper choice of magnetic field B values. ...
Acknowledgments: We are greatly obliged to the World Data Center of Geomagnetism, Kyoto (http://wdc.kugi.kyoto-u.ac.jp, (accessed on 22 November 2020)), for providing valuable D st and K p data for this ...
doi:10.3390/atmos12081059
fatcat:aisu5dyeoncdfhw66dseparaci
Morphology and diagnostic potential of the ionospheric Alfvén resonator
2021
Solar-Terrestrial Physics
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resonator, and on the facts of the influence of seismic disturbances on IAR. ...
), the frequency of which changes smoothly during the day. ...
The work was financially supported by the Ministry of Science and Higher Education of the Russian Federation. The contribution of A.S. Potapov ...
doi:10.12737/stp-73202104
fatcat:bgrgm4wlpbb7rlyvsp6v64vala
Bottom-up control of geomagnetic secular variation by the Earth's inner core
2013
Nature
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IAGA Meeting 2013 J1 Results from SWARM and preceding magnetic satellite missions 5 J2 Geomagnetic secular variation and rapid core dynamics from satellite and observatory measurements 13 J3 Assimilation ...
The Earth's plasmasphere: modelling and remote sensing 61 J13 From micro-to macro-scales in the heliosphere and magnetospheres 67 J14 Heliospheric structure during the ascending phase of solar cycle 24 ...
enhancements, attributed to the Alfven field line resonance. ...
doi:10.1038/nature12574
pmid:24108054
fatcat:vun7xleqonfzpp4c6waif5ji4e
On the man-made contamination on ULF measurements: evidence for disturbances related to an electrified DC railway
2014
Annales Geophysicae
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We speculate that the DC electrified railway (located &approx; 33 km from the Geomagnetic Observatory of L'Aquila, it maintained the same train traffic after the earthquake) is responsible for the ...
Our analysis reveals a persistent, season-independent, artificial signal, with the same characteristics in the <i>H</i> and <i>Z</i> components, that affects during daytime hours the entire spectrum; such ...
This research activity is supported by Consorzio "Area di Ricerca in Astrogeofisica", by the Italian MIUR-PRIN grant 2012P2HRCR on "The active Sun and its effects on space and Earth climate" and by PNRA ...
doi:10.5194/angeo-32-1153-2014
fatcat:tpxk7bkx7fgupbt545njjzuway
First-Principles Determination of Elastic Anisotropy and Wave Velocities of MgO at Lower Mantle Conditions
1999
Science
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medium during the passage of seismic waves. ...
of Earth's axial rotation, shows that the rotational eigenfrequency of the fluid core and some solar tidal waves were in resonance around 3.0 ϫ 10 9 , 1.8 ϫ 10 9 , and 3 ϫ 10 8 years ago. ...
doi:10.1126/science.286.5445.1705
pmid:10576730
fatcat:fh6hqmgjsrh25ipo3evlvnslcu
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