An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 144 Search : magnet
magnetic vector potential
  توند ِ برداری ِ مغناتیسی   
tavand-e bordâri-ye meqnâtisi

Fr.: vecteur potentiel magnétique   

A vector field A defined so that the → magnetic field  B is given by its → curl: B = ∇ x A.

magnetic; → vector; → potential.

magnetic-dipole radiation
  تابش ِ دوقطبه‌ی ِ مغناتیسی   
tâbeš-e doqotbe-ye meqnâtisi (#)

Fr.: rayonnement du dipôle magnétique   

Radiation emitted by a rotating magnet.

magnetic; → dipole; → radiation.

magnetics
  مغناتیک   
meqnâtik

Fr.: magnétisme   

The study of magnetic phenomena, comprising magnetostatics and electromagnetism.

magnetic; → -ics.

magnetism
  مغنات‌مندی   
meqnâtmandi

Fr.: magnétisme   

The science of magnetic phenomena, including the fields and forces produced by magnets and, more generally, by moving electric charges.

N.L. magnetismus; → magnet + → -ism.

Magnetism in Massive Stars (MiMeS)
     
MiMeS

Fr.: MiMeS   

An international collaboration devoted to the study of the origin and physics of → magnetic fields in → massive stars. The project uses several observatories and a large number of telescopes equipped with → spectropolarimetric and → asteroseismologic instruments, including → HARPS, → HARPSpol, and → ESPaDOnS (Wade et al., 2016, MNRAS 456, 2).

magnetism; → massive; → star.

magnetization
  مغناتش   
meqnâteš

Fr.: magnétisation   

1) General: The process of magnetizing or the state of being magnetized.
2) Electricity: The → magnetic moment per unit volume induced by an external magnetic field; measured in → amperes per meter.

Verbal noun of → magnetize.

magnetize
  مغناتیدن   
meqnâtidan

Fr.: magnétiser   

To make a magnet of, or impart the properties of a magnet to.

From → magnet + → -ize.

magnetized
  مغناتیده   
meqnâtidé

Fr.: magnétisé   

Having been made magnetic; magnetic properties imparted to.

Past participle of → magnetize.

magnetized plasma
  پلاسمای ِ مغناتیده   
pelâmâ-ye meqnâtidé

Fr.: plasma magnétisé   

A plasma containing a magnetic field which is strong enough to change the path of charged particles. It can be a → collisional plasma or → noncollisional plasma.

magnetized; → plasma.

magnetized vacuum
  خلأ ِ مغناتیده   
xala'-e meqnâtidé

Fr.: vide magnétisé   

Empty space influenced by very strong → magnetic field. Same as → birefringent vacuum.

magnetized; → vacuum.

magneto-
  مغنات-، مغناتو-   
meqnât-, meqnâto-

Fr.: magnéto-, magnét-   

The prefix form of → magnet, representing magnetic or magnetism in compound words, such as → magnetogram, → magnetohydrodynamics.

magnet.

magneto-asteroseismology
  مغنات-اخترلرزه‌شناسی   
meqnât-axtarlarzešenâsi

Fr.: magnéto-astérosismologie   

Combined study of the large-scale → magnetic field (→ magnetometry) and → stellar pulsations (→ asteroseismology). Magneto-asteroseismology provides strong complementary diagnostics suitable for detailed stellar modeling and permits the determination of the → internal structure and conditions within → magnetic massive  → pulsators, for example the effect of magnetism on → mixing processes. More specifically, asteroseismology yields information on the → density, → composition, and → chemical mixing in multiple internal layers (depending on the number of studied frequencies). Additionally, when rotationally split pulsation modes are observed, the internal rotation profile can be retrieved. From magnetometry surface properties are determined, related to the → chemical composition, including → starspots, and the magnetic field, such as its geometry, obliquity, and strength. Magnetic studies also provide constraints about the → stellar wind geometry and the → circumstellar environment. Moreover, the stellar → rotation period period and the → angle of inclination toward the observer are also retrieved (Buysschaert et al., 2017, astro-ph/1709.02619).

magneto-; → asteroseismology.

magnetocentrifugal acceleration
  شتاب ِ مغنات-مرکزگریز   
šetâb-e meqnât-markazgoriz

Fr.: accelération magnetocentrifuge   

The acceleration exerted on the plasma particles according to the → magnetocentrifugal model.

magnetocentrifugal model; → acceleration.

magnetocentrifugal model
  مدل ِ مغنات-مرکزگریز   
model-e meqnât-markazgoriz

Fr.: modèle magnétocentrifuge   

A → magnetohydrodynamic model devised to account for the → bipolar jets and → outflows observed around → protostars. Basically, a → poloidal magnetic field is frozen into a rotating → accretion disk. If the angle between the magnetic field lines threading the disk and the rotation axis of the disk is larger than 30°, the plasma can be accelerated out of the accretion disk along the field lines. The field lines rotate at a constant → angular velocity, and as the gas moves outward along the field lines, it is accelerated by an increasing → centrifugal force (magnetocentrifugal acceleration). At some point, when the rotation velocity is about the same as the → Alfven velocity in the gas, the field lines get increasingly wound up by the inertia of the attached gas and a strong → toroidal magnetic field component is generated. The toroidal component is the main agent in collimating the flow into a direction along the → open magnetic field lines. The earliest version of the model was proposed by Blandford & Payne (1982, MNRAS 199, 883). It has two main versions: → X-wind and → disk wind models. See also → magnetorotational instability.

magneto-; → centrifugal; → model.

magnetogram
  مغنات‌نگاشت   
meqnâtnegâšt

Fr.: magnétogramme   

A graphic representation of solar magnetic field strengths and polarity.

From → magneto- + → -gram.

magnetohydrodynamic
  مغنات-و-هیدروتوانیک   
meqnâtohidrotavânik

Fr.: magnétohydrodynamique   

Of or relating to → magnetohydrodynamics.

magneto- + → hydrodynamic.

magnetohydrodynamics (MHD)
  مغنات-و-هیدروتوانیک   
meqnâtohidrotavânik

Fr.: magnétohydrodynamique   

The dynamics of an ionized plasma in the non-relativistic, collisional case. In this description, charge oscillations and high frequency electromagnetic waves are neglected. It is an important field of astrophysics since plasma is one of the commonest forms of matter in the Universe, occurring in stars, planetary magnetospheres, and interplanetary and interstellar space.

From → magneto- + → hydrodynamics.

magnetometer
  مغنات‌سنج   
meqnâtsanj

Fr.: magnétomètre   

Any of a variety of devices used to measure the strength and direction of a magnetic field.

From → magneto- + → -meter.

magnetometry
  مغنات‌سنجی   
meqnârsanji

Fr.: magnétométrie   

The detection or measurement of a magnetic field, especially its strength and direction. See also → magnetometer.

magneto-; → -metry.

magneton
  مگنتون   
magneton (#)

Fr.: magnéton   

Fundamental constant, first calculated by Bohr, for the intrinsic magnetic moment of an electron. → Bohr magneton.

From → magnet + → -on.

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