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Littérature scientifique sur le sujet « Magnetometer array studies »

Auteur : Grafiati

Publié le 6 septembre 2023

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Articles de revues sur le sujet "Magnetometer array studies"

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Gough, D. I. « The Interpretation of Magnetometer Array Studies ». Geophysical Journal of the Royal Astronomical Society 35, n^o 1-3 (15 septembre 2009) : 83–98. http://dx.doi.org/10.1111/j.1365-246x.1973.tb02416.x.

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Gough, D. Ian. « Magnetometer array studies, Earth structure, and tectonic processes ». Reviews of Geophysics 27, n^o 1 (1989) : 141. http://dx.doi.org/10.1029/rg027i001p00141.

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Untiedt, J., et W. Baumjohann. « Studies of polar current systems using the IMS Scandinavian magnetometer array ». Space Science Reviews 63, n^o 3-4 (1993) : 245–390. http://dx.doi.org/10.1007/bf00750770.

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Arora, B. R. « Magnetometer array studies in India : Present status, data interpretation and assessment of numerical modelling results ». Journal of Earth System Science 99, n^o 4 (décembre 1990) : 693–716. http://dx.doi.org/10.1007/bf02840323.

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Engebretson, M. J., W. J. Hughes, J. L. Alford, E. Zesta, L. J. Cahill, R. L. Arnoldy et G. D. Reeves. « Magnetometer array for cusp and cleft studies observations of the spatial extent of broadband ULF magnetic pulsations at cusp/cleft latitudes ». Journal of Geophysical Research 100, A10 (1995) : 19371. http://dx.doi.org/10.1029/95ja00768.

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Ahlers, Malte T., Christoph T. Block, Michael Winklhofer et Martin Greschner. « Integration and evaluation of magnetic stimulation in physiology setups ». PLOS ONE 17, n^o 7 (22 juillet 2022) : e0271765. http://dx.doi.org/10.1371/journal.pone.0271765.

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A large number of behavioral experiments have demonstrated the existence of a magnetic sense in many animal species. Further, studies with immediate gene expression markers have identified putative brain regions involved in magnetic information processing. In contrast, very little is known about the physiology of the magnetic sense and how the magnetic field is neuronally encoded. In vivo electrophysiological studies reporting neuronal correlates of the magnetic sense either have turned out to be irreproducible for lack of appropriate artifact controls or still await independent replication. Thus far, the research field of magnetoreception has little exploited the power of ex vivo physiological studies, which hold great promise for enabling stringent controls. However, tight space constraints in a recording setup and the presence of magnetizable materials in setup components and microscope objectives make it demanding to generate well-defined magnetic stimuli at the location of the biological specimen. Here, we present a solution based on a miniature vector magnetometer, a coil driver, and a calibration routine for the coil system to compensate for magnetic distortions in the setup. The magnetometer fits in common physiology recording chambers and has a sufficiently small spatial integration area to allow for probing spatial inhomogeneities. The coil-driver allows for the generation of defined non-stationary fast changing magnetic stimuli. Our ex vivo multielectrode array recordings from avian retinal ganglion cells show that artifacts induced by rapid magnetic stimulus changes can mimic the waveform of biological spikes on single electrodes. However, induction artifacts can be separated clearly from biological responses if the spatio-temporal characteristics of the artifact on multiple electrodes is taken into account. We provide the complete hardware design data and software resources for the integrated magnetic stimulation system.

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Janhunen, P., A. Olsson, J. Hanasz, C. T. Russell, H. Laakso et J. C. Samson. « Different Alfvén wave acceleration processes of electrons in substorms at ~4-5 <i>R<sub>E</sub></i> ; and 2-3 <i>R<sub>E</sub></i> ; radial distance ». Annales Geophysicae 22, n^o 6 (14 juin 2004) : 2213–27. http://dx.doi.org/10.5194/angeo-22-2213-2004.

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Abstract. Recent statistical studies show the existence of an island of cavities and enhanced electric field structures at 4-5RE radial distance in the evening and midnight magnetic local time (MLT) sectors in the auroral region during disturbed conditions, as well as ion beam occurrence frequency changes at the same altitude. We study the possibility that the mechanism involved is electron Landau resonance with incoming Alfvén waves and study the feasibility of the idea further with Polar electric field, magnetic field, spacecraft potential and electron data in an event where Polar maps to a substorm over the CANOPUS magnetometer array. Recently, a new type of auroral kilometric radiation (AKR) emission originating from ~2-3RE radial distance, the so-called dot-AKR emission, has been reported to occur during substorm onsets and suggested to also be an effect of Alfvénic wave acceleration in a pre-existing auroral cavity. We improve the analysis of the dot-AKR, giving it a unified theoretical handling with the high-altitude Landau resonance phenomena. The purpose of the paper is to study the two types of Alfvénic electron acceleration, acknowledging that they have different physical mechanisms, altitudes and roles in substorm-related auroral processes.

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Murphy, K. R., I. J. Rae, I. R. Mann, A. P. Walsh, D. K. Milling et A. Kale. « The dependence of Pi2 waveforms on periodic velocity enhancements within bursty bulk flows ». Annales Geophysicae 29, n^o 3 (10 mars 2011) : 493–509. http://dx.doi.org/10.5194/angeo-29-493-2011.

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Abstract. Pi2s are a category of Ultra Low Frequency (ULF) waves associated with the onset of magnetic substorms. Recent work has suggested that the deceleration of bulk plasma flows in the central plasmasheet, known as bursty bulk flows (BBFs), are able to directly-drive Pi2 oscillations. Some of these studies have further shown evidence that there is a one-to-one correlation between Pi2 magnetic waveforms observed on the ground and periodic peaks in flow velocity within the BBF, known as flow bursts. Utilising a favourable conjunction between the Geotail spacecraft and the Canadian Array for Real-time Investigations of Magnetic Activity (CARISMA) magnetometer array on 31 May 1998, we examine the causality of the link between BBF flow bursts and Pi2 waveforms. Using a series of analytical tests in both the time and frequency domains, we find that while the Pi2 and BBF waveforms are very similar, the ground response for this event occurs prior to the observed flow enhancements in the magnetotail. We conclude that during this specific case study the temporal variations of the flow bursts within the BBF are not directly-driving the observed ground-based Pi2 waveforms, despite the fact that a visual inspection of both time-series might initially suggest that there is a causal relationship. We postulate that rather than there being a direct causal relation, the similar waveforms observed in both Pi2s and BBFs may result from temporal variations in a common source for both the BBFs and the Pi2s, such as magnetic reconnection in the tail, this source modulating both the Pi2 and BBF at the same frequency.

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SUKHAREV, A., M. ORLYUK, M. RYABOV, L. SOBITNIAK, V. BEZRUKOVS, S. PANISHKO et A. ROMENETS. « Results of comparison of fast variations of geomagnetic field and ionospheric scintillations of 3C 144 radio source in the area of Odessa geomagnetic anomaly ». Astronomical and Astrophysical Transactions, Volume 33, Numéro 1 (1 juillet 2022) : 67–88. http://dx.doi.org/10.17184/eac.6481.

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From November 2017 to May 2019 at the Astronomical Observatory of Odessa I.I. Mechnikov National University, the variational component of the geomagnetic field was monitored to study short-periodic geomagnetic variations in the central part of the Odessa regional magnetic anomaly. The measurements were carried out using a LEMI-008 precision fluxgate magnetometer with a sampling rate of 1 Hz. The aim of this work is to compare the manifestation of short-periodic geomagnetic oscillations (which in some cases coincided with periods of geomagnetic pulsations) and ionospheric scintillations of the 3C 144 radio source (Taurus A) according to the data of URAN-4 low-frequency phased antenna array at frequencies of 20 and 25 MHz. The data obtained were processed on a daily basis using the method of continuous wavelet transform, as well as band-pass filtering based on Fourier transform, to select individual frequency bands containing irregular and quasi-harmonic variations in the geomagnetic field and radio flux density. The analysis of results of the observations, during geomagnetic disturbances, storms and in calm conditions, is carried out. The data from long-term monitoring of variational component of the geomagnetic field in the most interesting, central part of the Odessa magnetic anomaly, where such studies have not been conducted before, have been obtained. Observations of various manifestations of ionospheric scintillations were carried out both during magnetic storms and during a calm geomagnetic field. It is shown that during storms, main scintillation time scale of the 3C 144 radio source is 1–3 minutes. Ionospheric scintillations occasionally show a quasiperiodic structure.

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YEH, W. J., BO CHENG et KUN YANG. « FABRICATION OF UNIFORM ARRAY OF NANO-DOTS AND ITS APPLICATIONS ». International Journal of Modern Physics B 19, n^o 01n03 (30 janvier 2005) : 675–77. http://dx.doi.org/10.1142/s0217979205029304.

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We have developed a novel technique to fabricate extremely uniform arrays of nano-sized dots. Regular arrays of nanometer-sized metallic dots are obtianed by magnetron sputtering deposition through a nanochannel glass replica mask. The platinum replica masks are fabricated using thin film deposition on an etched nanochannel glass and contain hexagonally patterned uniform voids with diameters as small as 50 nanometers. The metallic dot density can be as high as 5×1011 per square centimeter. The magnetic properties of Ni and Co dot arrays have been studied by a Alternating Gradient Magnetometer. The magnetic dot array can be used as pinning centers for superconductors and also can be used as the discrete magnetic media for magnetic recording.

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Thèses sur le sujet "Magnetometer array studies"

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Pajunpää, Kari. « Magnetometer array studies in Finland ». Oulu, Finland : University of Oulu, 1989. http://catalog.hathitrust.org/api/volumes/oclc/20033413.html.

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Actes de conférences sur le sujet "Magnetometer array studies"

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Jian, Li, Wang Jialin, Zhao Jianyuan, Li Mingze et Huang Xinjing. « Research on Key Technologies of Precise Measurement of Geographic Coordinates of Subsea Pipelines ». Dans 2021 48th Annual Review of Progress in Quantitative Nondestructive Evaluation. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/qnde2021-74931.

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Abstract With the continuous increase of offshore oil and gas exploitation activities, the number of subsea pipelines is becoming larger and larger, which leads to frequent occurrence of subsea pipeline accidents. Long-term safe operation of subsea pipelines can be ensured by regular defect detection. The premise of locating and disposing defects is to accurately measure the geographic coordinates of subsea pipelines. Our research group has put forward a kind of pipeline spherical internal detector (SD), which has the advantages of convenient implementation, low risk to jam. For the SD, this paper has carried out research on the key technology of precise measurement of subsea pipelines’ geographic coordinates using the internal magnetic fields. The main work is as follows: (1) Magnetic tensor invariant calibration method for magnetometer array has been studied and L-M algorithm is taken to solve the parameters, which is efficient and accurate. Field calibration experiment has proved this method is effective and has good robustness. (2) A new method of measuring pipeline’s pitch angle is proposed. Under the experimental condition of using AC servo motor to drive the sensor instead of the SD to rotate, the pitch angle measurement error is less than 0.2°. (3) Magnetic anomaly of spiral weld and buckling pipeline are used as new mark points to calibrate the geographic coordinates of subsea pipelines. Experimental results show that the newly designed SD can successfully identify spiral welds and buckling pipeline.

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