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: 13176 Search : in
magnetic storm
  توفان ِ مغناتیسی   
tufân-e meqnâtisi (#)

Fr.: orage magnétique   

A temporary, worldwide disturbance of the Earth's magnetic field by streams of charged particles from the Sun. Magnetic storms are frequently characterized by a sudden onset, in which the magnetic field undergoes marked changes in the course of an hour or less, followed by a very gradual return to normalcy, which may take several days.

magnetic; → storm.

magnetic susceptibility
  برخودگیری ِ مغناتیسی   
barxodgiri-ye meqnêtisi

Fr.: susceptibilité magnétique   

A property of material defined by the ratio of the → magnetization to the → magnetic intensity. In other words, the magnetization per unit magnetic intensity.

magnetic; → susceptibility.

magnetic tape
  نوار ِ مغناتیسی   
navâr-e meqnâtisi

Fr.: bande magnétique   

A continuous, flexible ribbon impregnated or coated with magnetic-sensitive material on which information (sound, images, data, etc.) may be recorded.

magnetic; → tape.

magnetic tension
  تنش ِ مغناتیسی   
taneš-e meqnâtisi

Fr.: tension magnétique   

In → magnetohydrodynamic (MHD) treatment of → plasmas, that component of the → Lorentz force which is directed toward the centre of curvature of the → magnetic field lines and thus acts to straighten out the field lines. The Lorentz force can be decomposed into two components orthogonal to the magnetic field: j× B = (B . ∇) B / μ0 - ∇ (B2 / 2μ0), where j is the → current density, μ0 is the → magnetic permeability of free space, and B is the → magnetic flux density. The left side term is the Lorentz force, the first term on the right side is the magnetic tension and the second term the → magnetic pressure.

magnetic; → tension.

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.

<< < -es -it -sc 201 951 abe abs abs aca acc acc aco act ada adh ado aer aft air Alf alg alk alp Alt alt amb ana And ang ani ann ant ant ant apo app app Apu arc arg Arn art ass ast ast ast atm ato att aur aut avo azi bac bal bar bar bat Bea Bel bet bia big bin bio Bir bla bla blo Blu bol Boo bou box bre Bri bro bur cal cal Can cap car Car cat cau cel cen cen cha Cha cha che Chi chr cir cir civ cla clo clo CMB coa coe coh col col col com com com com com com com com Com con con con con con con con con con con con con coo cor cor cor Cos cos cos cou cou cra cri cro cry cul cur cyc D l dar dat day dea dec dec dec def def deg Del Den dep der det deu dew dic dif dif dil dip dir dis dis dis dis dis diu dog Dop dou Dra Dsc dus dwa dyn Dys Ear ecc eco edg egg Ein Ela ele ele ele ele ell eme emp enc eng ent epi equ equ equ eru eth Eur eve exa exc exe exi exo exp ext ext ext fab fai Fan fea fem fer fie fil fir fir fla fli flu foc for for for fra fre fre fri fun fuz gal gal gal Gam gau Gau gen geo geo geo geo Gib glo gov gra gra gra gra gre gro Gui H-a hal Ham har Hay hea hei hel Hel her het hie hig hoa hom hor hot Hub Hug hur hyd hyd hyl hyp ice ide ima ima imp imp inc inc ind ine inf inf inf ing inn ins ins int int int int int int int int inv inv ion iro Isl iso iso Jab jet Jov Jup Kar Kep kil Kip Kra Lag Lam Lan Lar las law lea Leg Leo lev lig lim lin lin lin lit loc loc log Lor low lum lun lun Lym Mac mag mag mag mag mag mai Mal map mas mas mat Mau mea mea med Men mer Mes Met met mic mic Mie mil min Mir mix mod mol mom Moo mor mov mul mur n-b nan nat nea neg Ner neu new New NGC noc nom non non nor nor nuc nuc nul nut obj obl obs occ oct off old one ope opp opt opt orb ord org Ori osc oth ove Owl P-s Pal par par par par Pas pat pec pen per per per per per Pha pha pho pho pho phy pie pix Pla pla pla pla Pli Poi pol pol pol pol por pos pos pow pre pre pre pre pri pri pri pro pro pro pro pro pro pro pub pul pyc qua qua qua qua qui rad rad rad rad rad rad rai ran rar Ray rea Rea rec rec red red ref ref reg rel rel rel ren res res res res ret rev Ric rig rin roc roo rot rot rur S5- Sal sat sca sca Sch sci Scu sec sec sed sel sel sem seq set sha she sho sid sie sil sim sin sit sky slo sno sod sol sol sol sol son sou spa spa spe spe spe spe sph spi spo squ sta sta sta sta ste ste ste Sti sto str str sub sub sub sul sup sup sup sup sur sur syl syn sys tal Tay tel ten ter tex the the the the Tho thr tid tim Tit too Tor tra tra Tra tra Tra tri Tri tru tub tur two Typ ult ult unc uni uni uni upl ura uti val var vec vel ver Ver vie vir vis vis vol W-R war wav wav wea Wei wha wid win WN3 Wol wri xen yok zen zij > >>