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 convection
  همبز ِ مغناتیسی   
hambaz-e meqnâtisi

Fr.: convection magnétique   

Thermal → convection modified by the presence of magnetic fields.

magnetic; → convection.

magnetic declination
  واکیلش ِ مغناتیسی   
vâkileš-e meqnâtisi

Fr.: déclinaison magnétique   

In terrestrial magnetism, the difference between → true north (the axis around which the earth rotates) and magnetic north (the direction the needle of a compass will point,→ magnetic pole).

magnetic; → declination.

magnetic diffusion
  پخش ِ مغناتیسی   
paxš-e meqnâtisi

Fr.: diffusion magnétique   

The process whereby the magnetic field tends to diffuse across the plasma and to smooth out any local inhomogeneities under the influence of a finite resistance in the plasma. For a stationary plasma the → induction equation becomes a pure → diffusion equation: ∂B/∂t = Dm2B, where Dm = (μ0σ0)-1 is the → magnetic diffusivity.

magnetic; → diffusion.

magnetic diffusivity
  پخشندگی ِ مغناتیسی   
paxšandegi-ye meqnâtisi

Fr.: diffusivité magnétique   

The → diffusion coefficient for a magnetic field. It is expressed as: η = 1/(μ0σ), where μ0 is the → magnetic permeability and σ the → conductivity.

magnetic; → diffusivity.

magnetic dip
  نشیب ِ مغناتیسی   
našib-e meqnâtisi

Fr.: inclinaison magnétique   

In terrestrial magnetism, the angle that a → magnetic needle makes with the horizontal plane at any specific location. The angle of magnetic dip at the → magnetic poles of Earth is 90°. Also called → inclination and → dip.

magnetic; → dip.

magnetic dipole
  دوقطبه‌ی ِ مغناتیسی   
doqotbe-ye maqnâtisi

Fr.: dipole magnétique   

A system that generates a → magnetic field in which the field is considered to result from two opposite poles, as in the north and south poles of a magnet, much as an → electric field originates from a positive and a negative charge in an → electric dipole. A loop carrying an electric current also acts as a magnetic dipole. Magnetic dipoles experience a torque in the presence of magnetic fields. → dipole moment; → magnetic moment.

magnetic; → dipole.

magnetic dipole moment
  گشتاور ِ دوقطبه‌ی ِ مغناتیسی   
gaštâvar-e doqotbe-ye meqnâtisi

Fr.: moment dipolaire magnétique   

Same as → magnetic moment.

magnetic; → dipole; → moment.

magnetic domain
  دمن ِ مغناتیسی   
daman-e meqnâtisi

Fr.: domaine magnétique   

Any of several microscopic areas in a → ferromagnetic material that possesses a net → magnetic field, because electron spins are aligned in the same direction. In the absence of an external magnetic field, the directions of the magnetization vectors of the separate domains do not coincide and the resultant magnetization of the whole body may be zero.

magnetic; → domain.

magnetic energy
  کاروژ ِ مغناتیسی   
kâruž-e meqnâtisi

Fr.: énergie magnétique   

The energy stored in a magnetic field. It is the → work that must be done to establish a magnetic field in terms of the → magnetic induction. Magnetic energy varies as the square of the magnetic induction. It can be expressed in several other ways, for example in terms of the current and of the magnetic flux, or in terms of the current density and vector potential.

magnetic; → energy.

magnetic field
  میدان ِ مغناتیسی   
meydân-e meqnâtisi (#)

Fr.: champ magnétique   

A field of force that is generated by electric currents, or, equivalently, a region in which magnetic forces can be observed.

magnetic; → field.

magnetic field line
  خط ِ میدان ِ مغناتیسی   
xatt-e meydân-e meqnâtisi (#)

Fr.: ligne de champ magnétique   

An imaginary line used for representing the strength and direction of a magnetic field. Charged particles move freely along magnetic field lines, but are inhibited by the magnetic force from moving across field lines.

magnetic; → field; → line.

magnetic field strength
  زور ِ میدان ِ مغناتیسی   
zur-e meydân-e meqnâtisi

Fr.: intensité du champs magnétique   

Same as → magnetic intensity.

magnetic; → field; → intensity.

magnetic flux
  شار ِ مغناتیسی   
šâr-e meqnâtisi (#)

Fr.: flux magnétique   

A measure of the quantity of magnetism or magnetic field. It is the number of lines of force passing normally through a given area. Magnetic flux is a scalar quantity defined as the surface integral of the → magnetic flux density. It is usually denoted by the Greek letter Φ and its SI unit is the → weber.

magnetic; → flux.

magnetic flux density
  چگالی ِ شار ِ مغناتیسی   
cagâli-ye šâr-e meqnâtisi (#)

Fr.: densité du flux magnétique   

A vector quantity measuring the strength and direction of the magnetic field. It is the → magnetic flux per unit area of a magnetic field at right angles to the magnetic force. Magnetic flux density is expressed in → teslas. Also called → magnetic induction.

magnetic; → flux; → density.

magnetic helicity
  پیچاری ِ مغناتیسی   
picâri-ye meqnâtisi

Fr.: hélicité magnétique   

A quantity that measures the extent to which the magnetic field lines wrap and coil around each other. It is closely related to field line topology. Magnetic helicity is defined by: HM = ∫ A . B dV, where A is the vector potential of the magnetic field and the integration is over a volume V. → helicity; → kinetic helicity

magnetic; → helicity.

magnetic inclination
  درکیل ِ مغناتیسی   
darkil-e meqnâtisi

Fr.: inclinaison magnétique   

Same as → magnetic dip or → dip.

magnetic; → inclination.

magnetic induction
  درهازش ِ مغناتیسی   
darhâzeš-e meqnâtisi

Fr.: induction magnétique   

1) Same as → magnetic flux density.
2) The production of a magnetic field in a piece of un-magnetized iron or other → ferromagnetic substance when a magnet is brought near it. The magnet causes the individual particles of iron, which act like tiny magnets, to line up so that the sample as a whole becomes magnetized.

magnetic; → induction.

magnetic intensity
  درتنویی ِ مغناتیسی   
dartanuyi-e meqnâtisi

Fr.: intensité magnétique   

Strength of a magnetic field at a point, denoted H. The force which could be exerted on unit north magnetic pole situated at that point. Measured in oersteds. Same as → magnetic field strength.

magnetic; → intensity.

magnetic massive star
  ستاره‌ی ِ پرجرم ِ مغناتیسی   
setâre-ye porjerm-e meqnâtisi

Fr.: étoile massive magnétique   

A → stellar magnetic field associated with a → massive star. Magnetic fields are detected only for seven to ten percent of all studied massive → OB stars, and the magnetic field occurrence does not depend on the → spectral type. Because these magnetic fields seem to be stable over long time-scales and their strength does not seem to correlate with known stellar properties, it is assumed that they are of fossil origin (→ fossil magnetic field) and are frozen into the → radiative envelope of the stars. The fields are those of the birth → molecular clouds, partly trapped inside the → pre-main sequence star during the cloud → collapse phase, possibly further enhanced by a → dynamo effect in the early fully convective stellar phase. Typically, the polar field strength ranges from about a hundred → Gauss up to several kiloGauss. However, some weaker fields, below 100 G, have recently been detected.
The stellar magnetic field influences many different regions of the star with various effects. In the deep interior of the star, the field influences the internal → mixing of the star and this affects the size of the → convective overshooting region, changing the lifetime of the star by decreasing the amount of fuel for nuclear burning. Magnetic stars can also confine their → stellar winds, due to their strong magnetic fields, into a → magnetosphere, which slows down the → rotational velocity of the star. This → magnetic braking is an efficient mechanism for → angular momentum transport. At the stellar surface, the magnetic fields can create and sustain areas of chemical over- or under-abundances and/or large temperature differences, which are called spots (Buysschaert et al., 2016, astro-ph/1709.02619).

magnetic; → massive; → star.

magnetic meridian
  نیمروزان ِ مغناتیسی   
nimruzân-e meqnâtisi

Fr.: méridien magnétique   

A meridian passing through the Earth's → magnetic poles.

magnetic; → meridian.

<< < -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 > >>