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: 13048 Search : far
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.

magnetic moment
  گشتاور ِ مغناتیسی   
gaštâvar-e meqnâtisi (#)

Fr.: moment magnétique   

1) A measure of the strength of a magnet or current-carrying coil. In the case of a bar magnet it is obtained by multiplying the distance between the two magnetic poles by the average strength of the poles. Same as → magnetic dipole moment See also → dipole moment.
2) A measure of the magnetic flux set up by the gyration of an electric charge in a magnetic field.
3) In atomic and nuclear physics, → spin magnetic moment.

magnetic; → moment.

magnetic monopole
  تک‌قطبه‌ی ِ مغناتیسی   
takqotbe-ye meqnâtisi (#)

Fr.: monopôle magnétique   

A hypothetical particle that carries a single → magnetic pole, in contrast to magnets which are north-south pole pairs. These massive particles (billions of times heavier than the → proton) are required by grand unified theories(→ GUTs) to explain the actual matter content of the Universe, particularly the dominance of matter upon → antimatter. However, their existence contradicts → Gauss's law for magnetism.

magnetic; → monopole.

magnetic monopole problem
  پراسه‌ی ِ تک‌قطبه‌ی ِ مغناتیسی   
parâse-ye takqotbe-ye meqnâtisi

Fr.: problème du monopôle magnétique   

A problem concerning the compatibility of grand unified theories (→ GUTs) with standard cosmology. If standard cosmology was combined with grand unified theories, far too many → magnetic monopoles would have been produced in the early Universe. The → inflation hypothesis aims at explaining the observed scarcity of monopoles. The inflation has deceased their density by a huge factor.

magnetic; → monopole; → problem.

magnetic needle
  سوزن ِ مغناتیسی   
suzan-e meqnâtisi

Fr.: aiguille aimantée   

A slender → magnet suspended in a magnetic compass on a mounting with little friction; used to indicate the direction of the Earth's → magnetic pole.

magnetic; → needle.

magnetic north pole
  قطب ِ هودر ِ مغناتیسی   
qotab-e hudar-e meqnâtisi

Fr.: pôle nord magnétique   

A point of the → magnetosphere where the Earth's → magnetic field points vertically downward; in other words it has a 90° → magnetic dip toward the Earth's surface. The magnetic north pole can also be defined as the point toward which the south pole of the → compass needle is directed. The magnetic north pole is different from the → geographic north pole. It is actually hundreds of kilometers south of the geographic north pole. However, this has not always been the case. In the past 150 years it has moved more than 1,000 kilometers. Every 200,000 to 300,000 years the magnetic field of the Earth reverses direction, → magnetic reversal. Since the Earth's magnetic field is not exactly symmetrical, the north and south magnetic poles are not → antipodal.

magnetic; → north; → pole.

magnetic null point
  نقطه‌ی ِ نول ِ مغناتیسی   
noqte-ye nul-e meqnâtisi

Fr.: point nul magnétique   

A region of the → solar corona where the → magnetic field vanishes.

magnetic; → null; → point.

magnetic permeability
  تراوایی ِ مغناتیسی   
tarâvâyi-ye meqnâtisi (#)

Fr.: perméabilité magnétique   

The ratio of the → magnetic induction, B, in the substance to the external magnetic field, H, causing the → induction: μ = B/H. It is measured in henry/meter and is known as absolute permeability. The relative permeability is equal to the ratio of absolute permeability to the permeability of the free space. Thus μr = μ/μ0, where μ0, the permeability of free space has the value 4π x 10-7 henry/meter.

magnetic; → permeability.

<< < -es -iv -ti 21 a p abe abs abs aca acc acc acr act ada adh Adr aer AGB air Alf Alg all alp alt AM amo ana And ang ani ano Ant Ant apa apo app app Ara Arc ari Arr ash ass ast ast asy atm ato att aut ave axi Bab bal Bal bar bar bea Bek Bes bia Big bin bin bip biv bla bli blu Boh Bol Bos bou bra bri bro buo cal cal can cap car Car cat cat CCD Cen cen CH cha cha che Che chr cir cir cit cla clo clo clu 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 Cop Cor cor cor cos cos cou cou Cow cre cri cro cry cur cya Cyg dan dar dat de- deb dec dec ded def deg del dem den dep des det dev dia dif dif dih dio Dir dis dis dis dis dis dis DO don dou dow dro dur dwa dyn Dys ear ebb ecl edg egg Ein Ela ele ele ele ele ell eme emp enc eng ent epi equ equ equ esc eth Eur Eve exa exc exe exi exp exp ext ext ext fac fal far fed Fer fer fie fin fir fis fla flo flu fol for for fou fra fre Fre fro fut G-t gal gal gam gas Gau Gem gen geo geo geo gia Gli Gol gra gra gra gra gre gri gui H I Hag hal har hat He- hea hel Hel her Hes hie hig his hom hor hot Hub Hug hur hyd hyd hyg 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 Io ion iro isl iso iso Jac jet jud jur Kel Kep kil Klo Kui Lag lam Lap Lar lat law lea len lep Lib lig lim lin lin Lio lit loc LOF lon Lor low lum lun Lup Lyo mac mag mag mag mag mag mai man Mar mas mas mat Max mea mec Meg Mer Mer met met Met mic Mid Mil min Mir mit mod mod mol mon Mor mou mul mul mys nan Nat nau nec neo neu nev New NGC no nom non non nor not nuc nuc num nut obj obs obs occ ocu oft ome Oor ope opp opt opt orb ord ori ort osc out ove oxi pai pan par par par par pas pea pen per per per per Per per pha phi pho pho pho phy pio Pla pla pla pla Pla plu Poi pol pol pol poo pos pos pot pra pre pre pre pre pri pri pro pro pro pro pro Pro pro pse pul pur qua qua qua qua que rac rad rad rad rad rad rad 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 Rus Sac sal sat sca sca Sch sci Scu sec sec Sed sel Sel sen ser Sex Sha she sho sid sig sil sim sin siz sla Sma sno sof sol sol sol sol sou sou spa spa spe spe spe sph spi spi spr squ sta sta sta sta ste ste ste Sto Str str str sub sub suc sun sup sup sup sup sur swa syn syn tab tar tek tem ter tes the the the the Tho thr tid tim Tis Too Tor tra tra Tra tra tra tri tri tru Tul tur two Typ ult un- und uni uni unk upp Urc utt val var vec vel ver vib vio vir vis voi vor wan wat wav wax wea Wei whi Wil win WN9 wor X-r yel you zer zod > >>