Maximum magnetic field in cosmic outflows systems

2015 ◽  
Author(s):  
K. Hajisharifi ◽  
H. Mehdian ◽  
A. Hasanbeigi
Keyword(s):  
Magnetic Field ◽  
Maximum Magnetic Field

scholarly journals Masses and Magnetic Fields of White Dwarfs in Cataclysmic Variables

1989 ◽  
Vol 114 ◽  
pp. 337-340
Author(s):  
J.P. Lasota ◽  
J.M. Hameury ◽  
A.R. King
Keyword(s):  
Magnetic Field ◽  
Angular Momentum ◽  
Magnetic Fields ◽  
White Dwarf ◽  
White Dwarfs ◽  
Cataclysmic Variables ◽  
Strong Support ◽  
Drastic Reduction ◽  
Secondary Star ◽  
Maximum Magnetic Field

We show that the existence of the AM Her period spike implies (i) a unique white dwarf mass ≃ 0.6 − 0.7M⊙ for most magnetic CV’s (ii) nova explosions remove exactly the accreted mass from magnetic white dwarfs, and (iii) the maximum magnetic field for most CV’s is ≤ 4 × 107 G. The existence of the spike is very strong support for the idea that the period gap results from a drastic reduction of angular momentum losses when the secondary star becomes fully convective.

Temperature Dependence of Magneto-Mechanical Response in Ni-Mn-Ga Magnetic Shape Memory Alloys

2004 ◽  
Vol 855 ◽  
Author(s):  
Leon M. Cheng ◽  
Garrett Landry ◽  
hannon P. Farrell ◽  
Rosaura Ham-Su ◽  
Calvin V. Hyatt
Keyword(s):  
Magnetic Field ◽  
Mechanical Response ◽  
Anisotropy Constant ◽  
Systematic Investigation ◽  
Critical Magnetic Field ◽  
Effect Of Temperature ◽  
Magnetic Shape Memory ◽  
Magnetic Anisotropy Constant ◽  
Maximum Magnetic Field ◽  
Magnetic Forces

ABSTRACTIn this work, a systematic investigation is being carried out on single crystals of Ni47.8Mn27.5Ga24.7 alloy to determine the effect of temperature on the magneto-mechanical behaviour of the Ni-Mn-Ga alloys. Repeated mechanical and magnetic forces have been applied at various temperatures below the martensite finish (MF) temperature. It has been observed that twinning start and finish stresses, critical magnetic field and maximum magnetic-field-induced strain all remain almost constant within about 20K below MF and then change substantially at lower temperatures. Eventually no magnetic-field-induced strain can be observed at temperatures below 262K. It is proposed that although magnetic anisotropy constant increases with decreasing temperature, it is not sufficient to overcome the increasing twinning stresses required for twin boundary motion at lower temperatures.

scholarly journals Scaling Law of Stray Fields from SMES Coil Configurations as Functions of Stored Energy and Maximum Magnetic Field.

2002 ◽  
Vol 37 (5) ◽  
pp. 202-207 ◽  
Author(s):  
Takataro HAMAJIMA ◽  
Kimiyasu SATO ◽  
Hiroshi YAMADA ◽  
Naoyuki HARADA ◽  
Makoto TSUDA ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Scaling Law ◽  
Stored Energy ◽  
Maximum Magnetic Field

IRREVERSIBLE SUSCEPTIBILITY OF INITIAL MAGNETIZATION CURVES DEFINED BY ENERGY CONSIDERATION

2007 ◽  
Vol 21 (21) ◽  
pp. 3707-3717 ◽  
Author(s):  
G. GOEV ◽  
V. MASHEVA ◽  
M. MIKHOV ◽  
J. GESHEV
Keyword(s):  
Magnetic Field ◽  
Hysteresis Loops ◽  
Model System ◽  
Magnetization Curves ◽  
Maximum Magnetic Field ◽  
Initial Magnetization ◽  
Curve Method ◽  
Energy Consideration ◽  
Minor Hysteresis Loops ◽  
Magnetization Processes

A method for the estimation of reversible and irreversible susceptibilities of initial magnetization curves has been developed. It deals with the energy necessary for magnetizing and demagnetizing the sample, but neither with the nature of the magnetization processes nor with a specific type of anisotropy, so it could be applied for a wide variety of real materials. A set of minor hysteresis loops of an initially demagnetized sample, plotted with progressively increasing maximum magnetic field, has been used. The obtained results showed excellent agreement with those calculated by the remanence curve method for a Stoner–Wohlfarth model system.

scholarly journals Sunspot magnetic fields: a comparison between the CrAO and SDO/HMI data

2020 ◽  
Vol 1 (2) ◽  
pp. 1-5
Author(s):  
Regina Biktimirova ◽  
Valentina Abramenko
Keyword(s):  
Magnetic Field ◽  
Linear Regression ◽  
Linear Approximation ◽  
Pearson Correlation ◽  
Field Measurements ◽  
Maximum Modulus ◽  
Maximum Magnetic Field ◽  
Magnetic Field Measurements ◽  
The Relationship ◽  
The Magnetic Field

We performed a digitization of maximum magnetic field measurements in sunspots. The original data were acquired as drawings at the Crimean Astrophysical Observatory of the Russian Academy of Sciences (CrAO RAS). About 1000 sunspots observed in 2014 have been analyzed. The data were compared to the corresponding measurements from the SDO/HMI instrument (with both the line-of-sight magnetic field Bz(HMI) and the modulus of the magnetic field vector B(HMI)). For the same sunspot, the maximum modulus of the magnetic field derived at CrAO was compared to the corresponding value from HMI. The Crimean data and the space-based data (of both types) were found to be in direct proportion to each other. A linear approximation over the entire range of measurements (1–4) kilogauss (kG) shows a Pearson correlation coefficient of 0.71 (with the 95 % confidence boundaries of 0.68–0.74) and a slope of linear regression of 0.65±0.02 for both types of the space-based data. A linear approximation over the range of strong fields B(CrAO) > 1.8 kG gives a similar correlation, however the slope of linear regression is far closer to unity and constitutes 0.90 for the relationship (Bz(HMI) vs B(CrAO)) and 0.84 for the relationship (B(HMI) vs B(CrAO)). In the range of weak fields B(CrAO) < 1.8 kG, a non-linear deviation (exceeding) of the space-based data is observed. Non-linearity can be explained, in part, by a specific routine of the magnetic field measurements at CrAO, however further investigations are needed to explore sources of possible non-linearity in the HMI data. The Crimean measurements of the maximum magnetic field in sunspots are concluded to be in good agreement with the corresponding SDO/HMI measurements, and therefore they can be used for scientific purposes.

Radial Evolution of Coronal Mass Ejections in the Inner Heliosphere: Catalog and Analysis

2020 ◽  
Author(s):  
Tarik Salman ◽  
Reka Winslow ◽  
Noé Lugaz
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Coronal Mass Ejections ◽  
The Sun ◽  
Maximum Magnetic Field ◽  
Venus Express ◽  
Radial Evolution ◽  
Inner Heliosphere

&lt;p&gt;Our knowledge of the properties of Coronal Mass Ejections (CMEs) in the inner heliosphere is constrained by the relative lack of plasma observations between the Sun and 1 AU. In this work, we present a comprehensive catalog of 47 CMEs measured in situ measurements by two or more radially aligned spacecraft (MESSENGER, Venus Express, STEREO, and Wind/ACE). We estimate the CME impact speeds at Mercury and Venus using a drag-based model and present an average propagation profile of CMEs (speed and deceleration/acceleration) in the inner heliosphere. We find that CME deceleration continues past Mercury's orbit but most of the deceleration occurs between the Sun and Mercury. We examine the exponential decrease of the maximum magnetic field strength in the CME with heliocentric distance using two approaches: a modified statistical method and analysis from individual conjunction events. Findings from both the approaches are on average consistent with previous studies but show significant event-to-event variability. We also find the expansion of the CME sheath to be well fit by a linear function. However, we observe the average sheath duration and its increase to be fairly independent of the initial CME speed, contradicting commonly held knowledge that slower CMEs drive larger sheaths. We also present an analysis of the 3 November 2011 CME observed in a longitudinal conjunction between MESSENGER, Venus Express, and STEREO-B focusing on the expansion of the CME and its correlation with the exponential fall-off of the maximum magnetic field strength in the ejecta.&lt;/p&gt;

Scaling Law of Fringe Fields as Functions of Stored Energy and Maximum Magnetic Field for SMES Configurations

2004 ◽  
Vol 14 (2) ◽  
pp. 705-708 ◽  
Author(s):  
T. Hamajima ◽  
T. Yagai ◽  
N. Harada ◽  
M. Tsuda ◽  
H. Hayashi ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Scaling Law ◽  
Stored Energy ◽  
Maximum Magnetic Field ◽  
Fringe Fields

scholarly journals On Slowly Rotating Magnetized White Dwarfs

2017 ◽  
Vol 45 ◽  
pp. 1760025 ◽  
Author(s):  
Diana Alvear Terrero ◽  
Daryel Manreza Paret ◽  
Aurora Pérez Martínez
Keyword(s):  
Magnetic Field ◽  
General Relativity ◽  
Equation Of State ◽  
Quadrupole Moment ◽  
Constant Magnetic Field ◽  
White Dwarfs ◽  
Moment Of Inertia ◽  
Maximum Magnetic Field ◽  
The Moment ◽  
Anisotropic Pressures

Rotating magnetized white dwarfs are studied within the framework of general relativity using Hartle’s formalism. Matter inside magnetized white dwarfs is described by an equation of state of particles under the action of a constant magnetic field which introduces anisotropic pressures. Our study is done for values of magnetic field below [Formula: see text] G - a threshold of the maximum magnetic field obtained by the cylindrical metric solution - and typical densities of WDs. The effects of the rotation and magnetic field combined are discussed, we compute relevant magnitudes such as the moment of inertia, quadrupole moment and eccentricity.

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