An optimized low-frequency three-axis search coil magnetometer for space research

2005 ◽  
Vol 76 (4) ◽  
pp. 044502 ◽  
Author(s):  
H. C. Séran ◽  
P. Fergeau
Keyword(s):  
Low Frequency ◽  
Space Research ◽  
Search Coil

scholarly journals Development of Ground-Based Search-Coil Magnetometer for Near-Earth Space Research

2016 ◽  
Vol 21 (4) ◽  
pp. 509-515
Author(s):  
Jehyuck Shin ◽  
Khan-Hyuk Kim ◽  
Ho Jin ◽  
Hyomin Kim ◽  
Jong-Woo Kwon ◽  
...  
Keyword(s):  
Space Research ◽  
Earth Space ◽  
Search Coil ◽  
Near Earth Space

Search Coil Magnetometer Based on Multi-parameter Joint Optimization Design in Ultra Low-Frequency Communication

2018 ◽  
Vol 23 (2) ◽  
pp. 312-317 ◽  
Author(s):  
Chunteng Li ◽  
Yuzhong Jiang ◽  
Guanghui Yang ◽  
Fangjun Liu
Keyword(s):  
Optimization Design ◽  
Low Frequency ◽  
Joint Optimization ◽  
Search Coil

Analytical Optimization of Low-Frequency Search Coil Magnetometers

2012 ◽  
Vol 12 (8) ◽  
pp. 2719-2723 ◽  
Author(s):  
A. Grosz ◽  
E. Paperno
Keyword(s):  
Low Frequency ◽  
Search Coil ◽  
Frequency Search

scholarly journals CalMagNet – an array of search coil magnetometers monitoring ultra low frequency activity in California

2008 ◽  
Vol 8 (2) ◽  
pp. 359-368 ◽  
Author(s):  
J. Cutler ◽  
J. Bortnik ◽  
C. Dunson ◽  
J. Doering ◽  
T. Bleier
Keyword(s):  
Low Frequency ◽  
Magnetic Fluctuations ◽  
Resonant Structures ◽  
Search Coil ◽  
Long Term Study ◽  
Local Site ◽  
Timing System ◽  
Field Fluctuations ◽  
Alfven Resonator

Abstract. The California Magnetometer Network (CalMagNet) consists of sixty-eight triaxial search-coil magnetometer systems measuring Ultra Low Frequency (ULF), 0.001–16 Hz, magnetic field fluctuations in California. CalMagNet provides data for comprehensive multi-point measurements of specific events in the Pc 1–Pc 5 range at mid-latitudes as well as a systematic, long-term study of ULF signals in active fault regions in California. Typical events include geomagnetic micropulsations and spectral resonant structures associated with the ionospheric Alfvén resonator. This paper provides a technical overview of the CalMagNet sensors and data processing systems. The network is composed of ten reference stations and fifty-eight local monitoring stations. The primary instruments at each site are three orthogonal induction coil magnetometers. A geophone monitors local site vibration. The systems are designed for future sensor expansion and include resources for monitoring four additional channels. Data is currently sampled at 32 samples per second with a 24-bit converter and time tagged with a GPS-based timing system. Several examples of representative magnetic fluctuations and signals as measured by the array are given.

Observations of seismo-electromagnetic earthquake precursor radiation signatures along Southern Californian fault zones: Evidence of long-distance precursor ultra-low frequency signals observed before a moderate Southern California earthquake episode

1991 ◽  
Vol 69 (8-9) ◽  
pp. 1138-1145 ◽  
Author(s):  
Jack Y. Dea ◽  
Charles I. Richman ◽  
Wolfgang-M. Boerner
Keyword(s):  
San Diego ◽  
Southern California ◽  
Measurement Data ◽  
Low Frequency ◽  
Earthquake Precursor ◽  
Fault Zones ◽  
Frequency Noise ◽  
Long Distance ◽  
Unique Region ◽  
Search Coil

Although questioned for a long time, there is accumulating growing evidence for the existence of detectable seismo-electromagnetic phenomena worldwide. California is geologically as well as seismically a unique region for studying these phenomena in depth; and, in particular, the southern California geologic province with a multitude of offshore and inland fault zones with San Diego in its center. At the Naval Ocean Systems Center Low Frequency Noise Laboratory, San Diego CA., we monitor 0.1–10 Hz ultra-low frequency (ULF) and 10–40 Hz extremely low-frequency (ELF) signals using mu-metal loaded multitum search coil sensors, as well as 10–100 kHz very low-frequency signals using large 1 m diameter loop antennas. We have observed precursor seismo-electromagnetic emissions of several earthquake events. In this paper, we report on observations of broadband ULF signals before and during the Upland quake of April 17, 1990 (Ms = 4.6), centered 200 km N of San Diego. The signals were detected with the vertically oriented search coil sensor and not with the horizontally oriented sensors, which suggests a disturbed ionosphere as the most likely source of these signals. The large prequake ULF activity, the rapid decay of ULF activity after the quake, and the absence of any geomagnetic storms indicate a good correlation of the ULF activity with the Upland quake. Although the exact mechanisms for coupling geologic activity to the ionosphere is not known, we cite a number of hypotheses concerning these mechanisms. Based on this succinct overview, an interpretation of our radio observations of seismic activity is presented and extended to earthquake precursor or predictor studies. We are in the process of expanding this research with the building of more monitoring stations and the improvement of our measurement, data collection, formatting, and data processing capabilities.

Simplified Design of a Low Frequency Search Coil Magnetometer

2019 ◽  
Author(s):  
Madalina BUCUR ◽  
Georgiana ROSU ◽  
Adelina BORDIANU ◽  
Lucian PETRESCU ◽  
Valentin IONITA ◽  
...  
Keyword(s):  
Low Frequency ◽  
Search Coil ◽  
Frequency Search

A Study on the Fine Structure of the Lateral Line Organ of the Sea Eel

1973 ◽  
Vol 31 ◽  
pp. 648-649
Author(s):  
K. Hama
Keyword(s):  
Fine Structure ◽  
Electron Microscope ◽  
Lateral Line ◽  
Low Frequency ◽  
Sensory Cells ◽  
Apical Surface ◽  
Voltage Electron ◽  
Sensory Epithelia ◽  
Low Frequency Vibration ◽  
Transmission Electron

The lateral line organs of the sea eel consist of canal and pit organs which are different in function. The former is a low frequency vibration detector whereas the latter functions as an ion receptor as well as a mechano receptor.The fine structure of the sensory epithelia of both organs were studied by means of ordinary transmission electron microscope, high voltage electron microscope and of surface scanning electron microscope.The sensory cells of the canal organ are polarized in front-caudal direction and those of the pit organ are polarized in dorso-ventral direction. The sensory epithelia of both organs have thinner surface coats compared to the surrounding ordinary epithelial cells, which have very thick fuzzy coatings on the apical surface.

Lectin Binding to Human Breast Tumor Cells

1976 ◽  
Vol 34 ◽  
pp. 34-35
Author(s):  
Robert E. Nordquist ◽  
J. Hill Anglin ◽  
Michael P. Lerner
Keyword(s):  
Carcinoma Cell ◽  
Ricinus Communis ◽  
Lectin Binding ◽  
Low Frequency ◽  
Breast Carcinoma Cell Line ◽  
Human Breast ◽  
Human Breast Tumor ◽  
Duct Carcinoma ◽  
Specific Antigens ◽  
Ricin Agglutinin

A human breast carcinoma cell line (BOT-2) was derived from an infiltrating duct carcinoma (1). These cells were shown to have antigens that selectively bound antibodies from breast cancer patient sera (2). Furthermore, these tumor specific antigens could be removed from the living cells by low frequency sonication and have been partially characterized (3). These proteins have been shown to be around 100,000 MW and contain approximately 6% hexose and hexosamines. However, only the hexosamines appear to be available for lectin binding. This study was designed to use Concanavalin A (Con A) and Ricinus Communis (Ricin) agglutinin for the topagraphical localization of D-mannopyranosyl or glucopyranosyl and D-galactopyranosyl or DN- acetyl glactopyranosyl configurations on BOT-2 cell surfaces.

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