Magnetic Field Intensity

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Dario Passos - One of the best experts on this subject based on the ideXlab platform.

  • near earth heliospheric Magnetic Field Intensity since 1750 2 cosmogenic radionuclide reconstructions
    Journal of Geophysical Research, 2016
    Co-Authors: M J Owens, J Beer, E W Cliver, K G Mccracken, Luke Barnard, Mike Lockwood, A P Rouillard, Dario Passos
    Abstract:

    This is Part 2 of a study of the near-Earth heliospheric Magnetic Field strength, B, since 1750. Part 1 produced composite estimates of B from geoMagnetic and sunspot data over the period 1750–2013. Sunspot-based reconstructions can be extended back to 1610, but the paleocosmic ray (PCR) record is the only data set capable of providing a record of solar activity on millennial timescales. The process for converting 10Be concentrations measured in ice cores to B is more complex than with geoMagnetic and sunspot data, and the uncertainties in B derived from cosmogenic nuclides (~20% for any individual year) are much larger. Within this level of uncertainty, we find reasonable overall agreement between PCR-based B and the geoMagnetic- and sunspot number-based series. This agreement was enhanced by excising low values in PCR-based B attributed to high-energy solar proton events. Other discordant intervals, with as yet unspecified causes remain included in our analysis. Comparison of 3 year averages centered on sunspot minimum yields reasonable agreement between the three estimates, providing a means to investigate the long-term changes in the heliospheric Magnetic Field into the past even without a means to remove solar proton events from the records.

  • near earth heliospheric Magnetic Field Intensity since 1750 1 sunspot and geoMagnetic reconstructions
    Journal of Geophysical Research, 2016
    Co-Authors: M J Owens, J Beer, E W Cliver, K G Mccracken, Luke Barnard, Mike Lockwood, A P Rouillard, Dario Passos
    Abstract:

    We present two separate time series of the near-Earth heliospheric Magnetic Field strength (B) based on geoMagnetic data and sunspot number (SSN). The geoMagnetic-based B series from 1845-2013 is a weighted composite of two series that employ the interdiurnal variability index; this series is highly correlated with in situ spacecraft measurements of B (correlation coefficient, r = 0.94; mean square error, MSE = 0.16 nT2). The SSN-based estimate of B, from 1750-2013, is a weighted composite of eight time series derived from two separate reconstruction methods applied to four different SSN time series, allowing determination of the uncertainty from both the underlying sunspot records and the B-reconstruction methods. The SSN-based composite is highly correlated with direct spacecraft measurements of B and with the composite geoMagnetic B time series from 1845-2013 (r = 0.91; MSE = 0.24 nT2), demonstrating that B can accurately reconstructed by both geoMagnetic and sunspot-based methods. The composite sunspot and geoMagnetic B time series, with uncertainties, are provided as supplementary electronic material.

Jianquan Yao - One of the best experts on this subject based on the ideXlab platform.

  • Magnetic Field tunability of square tapered no core fibers based on Magnetic fluid
    Journal of Lightwave Technology, 2014
    Co-Authors: Yinping Miao, Wei Lin, Kailiang Zhang, Binbin Song, Hao Zhang, Bo Liu, Jianquan Yao
    Abstract:

    A Magnetic-Field-tuned photonics device based on Magnetic fluid (MF) and a square tapered no-core fiber (NCF) sandwiched between two single-mode fibers (SMFs) has been demonstrated experimentally and theoretically. The enhanced evanescent Field effect in the NCF is achieved by tapering the square NCF utilizing a fusion splicer. The spectral dependence of the proposed device on the applied Magnetic-Field Intensity has been investigated. The results indicate that the multimode interference spectrum exhibits a blue-shift with the increment of the Magnetic-Field Intensity. A maximal sensitivity of −18.7 pm/Oe is obtained for a Magnetic Field strength ranging from 25 to 450 Oe. The proposed tunable device has several advantages, including low cost, ease of fabrication, simple and compact structure, and high sensitivity. Therefore, the Magnetic-Field-tuned square tapered NCF is expected to find potential applications in the Fields of optical fiber sensors, as well as fiber communications.

  • Magnetic Field tunability of optical microfiber taper integrated with ferrofluid
    Optics Express, 2013
    Co-Authors: Yinping Miao, Wei Lin, Kailiang Zhang, Yujie Yuan, Binbin Song, Hao Zhang, Bo Liu, Jianquan Yao
    Abstract:

    Optical microfiber taper has unique propagation properties, which provides versatile waveguide structure to design the tunable photonic devices. In this paper, the S-tapered microfiber is fabricated by using simple fusion spicing. The spectral characteristics of microfiber taper integrated with ferrofluid under different Magnetic-Field intensities have been theoretically analyzed and experimentally demonstrated. The spectrum are both found to become highly Magnetic-Field-dependent. The results indicate the transmission and wavelength of the dips are adjustable by changing Magnetic Field Intensity. The response of this device to the Magnetic Field Intensity exhibits a Langvin function. Moreover, there is a linear relationship between the transmission loss and Magnetic Field Intensity for a Magnetic Field Intensity range of 25 to 200Oe, and the sensitivities as high as 0.13056dB/Oe and 0.056nm/Oe have been achieved, respectively. This suggests a potential application of this device as a tunable all-in-fiber photonic device, such as magneto-optic modulator, filter, and sensing element.

Eric Beaugnon - One of the best experts on this subject based on the ideXlab platform.

  • temperature induced structure transition in a liquid co b eutectic alloy
    Materials Letters, 2019
    Co-Authors: Jun Wang, Eyub Yildiz, Sebastien Pairis, Eric Beaugnon
    Abstract:

    Abstract The structure of metallic melt is not homogeneous and liquid–liquid structure transition (LLST) widely exists which can make strong influence on the subsequent solidification process. Here we report an experimental evidence of temperature induced LLST in a Co-B eutectic melt by in-situ measuring the magnetization within a wide temperature range under high Magnetic Fields. A transition point ( T 0 ) and two paraMagnetic Curie temperatures ( ϑ p (L1), ϑ p (L2)) corresponding to two different structures of the liquids are determined. The effects of Magnetic Field Intensity on the LLST and paraMagnetic curie temperatures are studied, and T 0 and ϑ p (L2) are found not sensitive to the Field Intensity, whereas, ϑ p (L1) shifts to lower temperatures with the increasing Magnetic Field Intensity.

  • effect of strong static Magnetic Field on the microstructure and transformation temperature of co ni al ferroMagnetic shape memory alloy
    Journal of Materials Science: Materials in Electronics, 2018
    Co-Authors: Xiangyi Xue, Jun Wang, Eric Beaugnon, Hongchao Kou, Pingxiang Zhang
    Abstract:

    The effect of strong static Magnetic Field (SSMF) on the microstructure and phase transformation temperature of Co38Ni33Al29 ferroMagnetic shape memory alloy during heat treatment has been studied. Results indicate that the microstructure and phase transformation temperature are significantly affected by the external SSMF. With the increasing Magnetic Field Intensity, the volume fraction of γ phase decreased from 13.2 to 5.1%, the morphologies of γ phase evolved from rods to discrete stripes, and a clear alignment of γ phase was observed. In addition, the transformation temperatures are also elevated as the Magnetic Field Intensity increases. The martensitic transformation temperature (MS) and the Curie point (TC) rose by 13 K and 10 K respectively when 4 T SSMF was applied. Moreover, the coercivity (HC) dramatically reduced to 11.7 Oe at 4 T Magnetic Field. Magnetic domains formed in β phase and they became ordered with the enhancing intensities of Magnetic Field.

Perarne Lindqvist - One of the best experts on this subject based on the ideXlab platform.

Satoko Nakamura - One of the best experts on this subject based on the ideXlab platform.

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