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

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Number of Results: 12955 Search : far
solar radii
  شعاع(های) ِ خورشید   
šo'â'(hây)-e xoršid

Fr.: rayons solaires   

Plural form of → solar radius.

solar; → radii.

solar radius
  شعاع ِ خورشید   
šo'â'-e xoršid

Fr.: rayon solaire   

A unit of length, representing the radius of the → Sun, used to express the size of stars in astrophysics. It is equivalent to: 695,700 km, 0.00465047 → astronomical units, 7.35355 × 10-8 → light-years, and 2.32061 → light-seconds.

solar; → radius.

solar rotation
  چرخش ِ خورشید   
carxeš-e xoršid (#)

Fr.: rotation du Soleil   

The motion of the Sun around an axis which is roughly perpendicular to the plane of the → ecliptic; the Sun's rotational axis is tilted by 7.25° from perpendicular to the ecliptic. It rotates in the → counterclockwise direction (when viewed from the north), the same direction that the planets rotate (and orbit around the Sun). The Sun's rotation is differential, i.e. the period varies with latitude on the Sun (→ differential rotation). Equatorial regions rotate in about 25.6 days. The regions at 60 degrees latitude rotate more slowly, in about 30.9 days.

solar; → rotation.

solar satellite
  بنده‌وار ِ خورشیدی   
bandevâr-e xoršidi

Fr.: satellite solaire   

A space vehicle designed to orbit about the Sun.

solar; → satellite.

solar spectrum
  بیناب ِ خورشید، ~ خورشیدی   
binâb-e xoršid (#), ~ xoršidi (#)

Fr.: spectre solaire   

The spectrum of the Sun's electromagnetic radiation, consisting of a continuum spectrum marked with dark absorption lines.

solar; → spectrum.

solar system
  راژمان ِ خورشیدی   
râšmân-e xoršidi

Fr.: Système solaire   

The collective name for the Sun and all objects gravitationally bound to it. These objects are the eight planets, their 166 known moons, five dwarf planets, and billions of small bodies. The small bodies include asteroids, icy Kuiper belt objects, comets, meteoroids, and interplanetary dust. The solar system is roughly a sphere with a radius greater than 100,000 AU. Planets, satellites, and all interplanetary material together comprise only about 1/750 of the total mass. Geochemical dating methods show that the solar system chemically isolated itself from the rest of the Galaxy (4.7 ± 0.1) × 109 years ago.

solar; → system.

solar system abundance
  فراوانی ِ راژمان ِ خورشیدی   
farâvâni-ye râžmân-e xoršidi

Fr.: abondance dans le système solaire   

Same as → protosolar abundance.

solar system; → abundance.

solar telescope
  تلسکوپ ِ خورشیدی، دوربین ِ ~   
teleslop-e xoršidi, durbin-e ~

Fr.: télescope solaire   

A telescope designed so that heating effects produced by the Sun do not distort the images.

solar; → telescope.

solar time
  زمان ِ خورشیدی   
zamân-e xoršidi (#)

Fr.: temps solaire   

The time based on the rotation of the Earth relative to the Sun. → mean solar time.

solar; → time.

solar tower
  برج ِ خورشیدی   
borj-e xoršidi

Fr.: tour solaire   

A structure used in solar observations in order to raise the equipment above the atmospheric disturbances caused by solar heating of the ground and the radiation of the heat into the atmosphere.

solar; → tower.

solar twin
  همزاد ِ خورشید   
hamzâd-e xoršid

Fr.: jumeau du soleil   

An ideal star possessing fundamental physical parameters (mass, chemical composition, age, effective temperature, luminosity, gravity, magnetic fields, equatorial rotation, etc.) very similar, if not identical, to those of the Sun. See also → solar analog; → solar-like star.

solar; → twins paradox.

solar velocity
  تندای ِ خورشید، ~ خورشیدی   
tondâ-ye xoršid, ~ xoršidi

Fr.: vitesse solaire   

The rate of change of the Sun's position with respect to the local standard of rest toward the → solar apex.

solar; → velocity.

solar wind
  باد ِ خورشید، ~ ِ خورشیدی   
bâd-e xoršid, ~ xoršidi

Fr.: vent solaire   

A mass outflow, consisting of protons, electrons, and other subatomic particles, expelled constantly from the solar corona at about 500 km per second. The solar mass-loss rate in this phenomenon amounts to about 2 x 10-14 solar masses per year, or about 106 tons per second. → stellar wind.

solar; → wind.

solar year
  سال ِ خورشیدی   
sâl-e xoršidi (#)

Fr.: année solaire   

The period of time required for the Earth to make one complete revolution around the Sun. Solar year is a general term for: → tropical year, → vernal equinox year, and → autumnal equinox year, which have different lengths.

solar; → year.

solar-like star
  ستاره‌ی ِ خورشیدمانند   
setâre-ye xoršid-mânand

Fr.: étoile semblable au soleil   

A member of a very broad class of stars in which is found a mixture of late F, early, middle, and, sometimes, late G type dwarfs and sub-giants. See also → solar analog; → solar twin.

solar; → -like; → star.

solar-terrestrial phenomena
  پدیده‌های ِ خورشیدی-زمینی   
padidehâ-ye xoršidi-zamini

Fr.: phénomènes solaires-terrestres   

Any of the various phenomena observable on the Earth that are caused by the influence of the Sun, such as aurora borealis.

solar; → terrestrial; → phenomenon.

Solberg-Hoiland criterion
  سنجیدار ِ سولبرگ-هویلاند   
sanjidâr-e Solberg-Høiland

Fr.: critère de Solberg-Høiland   

A criterion for → convective stability in → massive stars. The Solberg-Høiland stability criterion corresponds to the inclusion of the effect of → rotation (variation of → centrifugal force) in the convective stability criterion. It is a combination of → Ledoux's criterion (or possibly → Schwarzschild's criterion) and → Rayleigh's criterion. Both the dynamical shear and Solberg-Høiland instabilities occur in the case of a very large → angular velocity decrease outwards. Therefore, in a → rotating star the Ledoux or Schwarzschild criteria for convective instability should be replaced by the Solberg-Høiland criterion. More specifically, this criterion accounts for the difference of the centrifugal force for an adiabatically displaced fluid element. It is also known as the axisymmetric baroclinic instability. It arises when the net force (gravity + buoyancy + centrifugal force) applied to a fluid parcel in an adiabatical displacement has components only in the direction of the displacement (A. Maeder, Physics, Formation and Evolution of Rotating Stars, 2009, Springer).

E. Høiland, 1939, On the Interpretation and Application of the Circulation Theorems of V. Bjerknes. Archiv for mathematik og naturvidenskab. B. XLII. Nr. 5. Oslo.
H. Solberg, 1936 (reprint), Le mouvement d'inertie de l'atmosphere stable et son rôle dans la théorie des cyclones.
H. Solberg, 1941, On the Stability of the Circular Vortex. Avhandl. utg. av Det Norske Videnskaps-Akademi i Oslo. I. Mat-Naturv. Klasse. No. 11.
Wasiutynski, J. 1946, Astrophysica Norvegica, 4, 1.

sole
  کف ِ پا   
kaf-e pâ (#)

Fr.: plante   

The bottom or under surface of the → foot.

M.E., from O.Fr., from L. solea "sandal, bottom of a shoe," from solum "base, bottom, ground," of unknown origin.

From kaf, "the sole of the foot; the palm of the hand," → floor; , → foot.

Soleil compensator
  پاهنگنده‌ی ِ سولی   
pâhangande-ye Soleil

Fr.: compensateur de Soleil   

An optical compensator which produces a constant phase change over the entire field, as opposed to the phase change produced by the → Babinet compensator, which occurs progressively across the field. The compensator consists of two wedges of the same wedge angle and a parallel plate. The optic axes of the two wedges has the same orientation. These form a variable thickness plate. One of the wedges is assembled to the fixed parallel plate. The optic axis of the parallel plate is at 90° to that of the wedges. The other wedge is attached to a micrometer and moves to produce a thickness difference between the fixed and variable thickness plates, thus producing a phase delay.

Jean-Baptiste Soleil (1798-1849); → compensateur.

solenoid
  سولوار   
sulvâr

Fr.: solénoïde   

A long coil of insulated copper wire containing a large number of close turns. The strength of magnetic field produced by a current carrying solenoid is directly proportional to the number of turns in the solenoid and to the strength of current in the solenoid. It also depends on the nature of "core material" used in making the solenoid. The use of → soft iron rod as core in a solenoid produces the strongest magnetism.

From Fr. solénoïde "pipe-shaped," from Gk. solen "pipe, channel" + combining form of eidos "form, shape," → -oid.

Sulvâr, from sul "pipe, gutter," Lori sil, Sangesari sula, Šahmirzâdi solla, Tabari seltek, may be cognate with Gk. solen, as above, + -vâr, → -oid.

<< < -es -iv -ti 21- A r abe abs abs acc acc acc act act ada adi adu aff age alc Alf ali all alp alt ama amp ana ang ang ann ano ant ant ape apo app aps arc Arg ari art ass ast ast ast atm ato att aur aut axi B r bac Bal Bar Bar Bay bec Ber Bet Bie bij bin bio bis bla bla blu blu bol Bor bou Bra bre bro Bug C-s cal Cam can car Car Cas cat cav cel cen cer Cha cha cha che cho cir cir cir 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 coo cor cor cor cos cos cos Cou cou Cra Cre cri cro cub cur cyc cyl dar dat daw de- Deb dec dec dee 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 dua dus dwa dyn e-f Ear ecl eco edu eig Ein ela ele ele ele Ele elo emi emp ene Enl env epi equ equ Eri est Euc eva evo exc exc exh Exo exp exp ext ext f(R fac fam fat fee Fer Fib fig fin fir fix fle flu foc for for for fra fre Fre fri fun fuz Gal gal gal Gam gau Gay gen Geo geo geo geo gim glo gov gra gra gra gra gre gro Gun hab hal han Har haz hea hel hel Hen Her het Hig hil hol Hoo hor hou Hub hum hyd hyd hyd hyp hys ide ign ima imp imp inc inc ind Ind inf inf inf inf inn ins ins int int int int int int int int inv ion ion Irr iso iso iso jan jit Jul jus Kel ker kin kni La lam lan Lap las lat Lay Led Len let lif lig lin lin lin liq Lit loc log lon lou low lum lun Lym M d Mag mag mag mag mag mag maj man mar mas mas mat mea mea mec mem mer Mes met met mho mic Mie Mil min mis MKS MOd mol Mon moo mot mul mul myo nak Nas nat neb neg neu neu New New nit noi non non nor nor nuc nuc nul nut obj obl obs occ oct off oli oni ope opp opt opt orb ord org orp osc out ove oxi pai Pan par par Par par pas Pav Pel per per per per Per per pha phi pho pho pho phy Pip Pla pla PLA pla ple plu pol pol pol pol pop pos pos pot Pra pre pre pre Pri pri pri pro pro pro pro pro pro pro Pto pul pur 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 rep res res res res ret RHB rid rig ris roc Ros rot rub Rut Sag sam sat sca sca Sch sci Sea sec sec see sel sem sen set Sha sha shi shu sid sil sim sin SIS ski Slo smo Soc sol sol sol sol son sou spa spa spe spe spe sph spi spi Spo 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 tel tem ter tes the the the the Tho thr tid tim Tit top tot tra tra TRA tra tre tri tri tru Tun Tus tym Typ ult unb und uni uni uns upp Urs vac van var Vei Ven ver vic Vir vir vis vol W 4 war wat wav wea wed wet wid win WN2 Wol wri xen yok zen zin > >>