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: 13116 Search : far
Corona Australis
  تاج ِ دشتری، ~ جنوبی   
tâj-e daštari, ~ jonubi

Fr.: Couronne australe   

The Southern Crown. A small, faint southern → constellation, also called Corona Austrini. Abbreviation: CrA, genitive: Coronae Australis.

corona; L. australis "southern."

Corona Borealis
  تاج ِ هودری، ~ شمالی   
tâj-e hudari, ~ šomâli

Fr.: Couronne boréale   

The Northern Crown. A small but prominent northern → constellation that lies east of → Arcturus, between → Boötes and → Hercules, and comprises a distinctive arc formed by the stars seven stars. Abbreviation: CrB; genitive: Coronae Borealis.

corona; L. borealis "northern."

coronagraph
  تاجنگار، هورتاجنگار   
tâjnegâr (#), hurtâjnegâr (#)

Fr.: coronographe   

An instrument which, when used in a telescope, produces an artificial eclipse, permitting the study of the → solar corona without a total eclipse of the Sun. It was invented in 1930 by the French astronomer Bernard Lyot (1897-1952).

From → corona + → -graph.

coronagraphic
  تاجنگاری، تاجنگاریک   
tâjnegâri, tâjnegârik

Fr.: coronographique   

Of, or relating to → coronagraphy.

coronagraphy; → -ic..

coronagraphy
  تاجنگاری   
tâjnegâri

Fr.: coronograhie   

A technique used to observe a relatively dim object (like an → exoplanet) lying close to an outshining bright source (such as star). This is done by blocking the bright object, in the same way the → solar corona is observed using a → coronagraph.

coronagraph + suffix -y.

coronal
  تاجی، هورتاجی   
tâji (#), hurtâji (#)

Fr.: coronal   

Of or relating to a → corona.

Adj., from → corona + → -al.

coronal condensation
  چگالش ِ تاجی   
cagâleš-e tâji

Fr.: condensation coronale   

A part of the → solar corona where the gas density and the temperature are higher than in its vicinity. The coronal condensations are visible on the solar limb, above → sunspot groups. Images in X-rays and those supplied by → coronagraphs in white light reveal that such condensations consist of structures in the form of nodes, underlining the corona magnetic field (M.S.: SDE).

coronal; → condensation.

coronal features
  آرنگ‌های ِ هورتاجی   
âranghâ-ye hurtâji

Fr.: motifs coronaux   

Several phenomena occurring in the Sun's corona, such as a → helmet streamer, → polar plume, → coronal loop, → coronal hole.

coronal; → feature.

coronal gas
  گاز ِ تاجی   
gâz-e tâji

Fr.: gaz coronal   

A component of the → interstellar medium in the Galaxy which appears as pockets of gas at temperatures of over one million degrees, but extremely low densities of 104 atoms per cubic centimeter. The hot coronal gas is believed to be material blown out of violent supernova explosions. It is called "coronal gas", after a similarity with the hot gas in → solar corona.

coronal; → gas.

coronal hole
  سوراخ ِ هورتاجی   
surâx-e hurtâji

Fr.: trou coronal   

An area in the → solar corona which appears dark in X-rays and ultraviolet light. The gas density in these areas are very low, about 100 times less than that of coronal → active regions. The magnetic field lines in a coronal hole extend out into → interplanetary space rather than returning to the Sun's surface, as they do in other parts of the Sun (→ open magnetic field line). Ionized hot gas can escape easily along such a path, and this brings about high speed → solar wind streams.

coronal; → hole.

coronal line
  خط ِ هورتاجی   
xatt-e hurtâji

Fr.: raie coronale   

An → emission line in the spectrum of the → solar corona caused by highly ionized metal ions; especially those of iron, such as the red and green lines at 6375 Å and 5303 Å [Fe X] (Fe9+ ion) and [Fe XIV] (Fe13+ ion), respectively. From their discovery in 1870 until 1939, it was believed that these → forbidden lines would be due to an unknown element, called → coronium. Ultraviolet and X-ray coronal lines are also detectable in stars.

coronal; → line.

coronal loop
  گردال ِ هورتاجی   
gerdâl-e hurtâj

Fr.: boucle coronale   

An arc-like structure in the Sun's → corona that is found around → sunspots and in → active regions. These structures are associated with the closed magnetic field lines that connect magnetic regions on the solar surface. The loops are sometimes as high as 10,000 km with their two ends situated in photosphere regions of opposite magnetic polarity. This implies that the coronal loops are tubes of magnetic flux filled with hot plasma. They last for days or weeks but most change quite rapidly.

coronal; → loop.

coronal mass ejection (CME)
  اشانش ِ جرم از هورتاج   
ešâneš-e jerm az hurtâj

Fr.: éjection de masse coronale   

A huge eruption of material from regions of the solar corona in which the magnetic field is closed, but which suffer an extremely energetic disruption. Over the course of several hours up to 10,000 billion kg of this material is ejected into → interplanetary space with a a speed of as high as 3000 km/s. CMEs are most spectacularly observed by a white light coronagraph located outside Earth's atmosphere. Such observations from Skylab in the early 1970's were the first to reveal this phenomenon. CME's disrupt the flow of the → solar wind and can produce intense electromagnetic disturbances that can severely damage satellites and disrupt power grids on Earth. When these ejections reach the Earth, they give rise to → geomagnetic storms. The frequency varies with the → solar cycle; during solar minimum they come at a rate of about one per week, and during maximum there is an average of about two or three per day. See also → interplanetary coronal mass ejections (ICME).

coronal; → mass; → ejection.

coronal rain
  باران ِ هورتاجی   
bârân-e hurtâji

Fr.: pluie coronale   

Material that condenses in the Sun's corona and appears to rain down into the chromosphere, as observed at the solar limb above strong sunspots.

coronal; → rain.

coronal streamer
  درفشک ِ هورتاجی   
derafšak-e hurtâji

Fr.: grand jet coronal   

A bright, narrow stream of particles traveling through the Sun's corona, visible in images taken with a coronagraph or during a total solar eclipse. Coronal streamers represent the most outwardly extended structures in the solar corona and result from the interaction between the solar slow wind and the large-scale magnetic field. → helmet streamer.

coronal; → streamer.

coronium
  کورونیوم   
koroniom

Fr.: coronium   

A hypothetical chemical element once thought to be at the origin of the → coronal lines seen during a solar → total eclipse

From coron-, from → corona + → -ium

CoRot
  کورو   
Corot

Fr.: CoRot   

An astronomical satellite led by the French Space Agency (CNES) in conjunction with the European Space Agency (ESA) and other international partners. Launched on 27 December 2006, its two objectives are to search for → extrasolar planets with short → orbital periods, particularly those of large terrestrial size, and to perform → asteroseismology by measuring solar-like oscillations in stars. Corot is the first spacecraft dedicated to extrasolar planet detection. It is equipped with a 27-cm diameter afocal telescope and four CCD cameras sensitive to tiny variations of the light intensity from stars. Corot detected its first extrasolar planet, Corot-1b, in May 2007. Mission flight operations were originally scheduled to end 2.5 years from launch but they have been extended to January 2010.

CoRot, acronym from → COnvection, → ROtation, and planetary → Transits, chosen for its similarity to the name of the French painter Jean Baptiste Camille Corot (1796-1875), the first of the great modern landscapists, who marked a significant departure from academic tradition and strongly influenced the development of landscape painting in the 19th century.

corotate
  هم‌چرخیدن   
hamcarxidan

Fr.: être en corotation   

To rotate jointly with or at the same speed as another rotating body.

co-; → rotate.

corotating interaction region (CIR)
  ناحیه‌ی ِ اندرژیرش ِ هم‌چرخنده   
nâhiye-ye andaržireš-e hamcarxandé

Fr.: région d'interaction en corotation   

A spiral-shaped density enhancement formed around a star when fast stellar winds collide with slower material. This large-scale wind structure can extend from the stellar surface to possibly several tens of stellar radii. The CIRs can be produced by intensity irregularities at the stellar surface, such as dark and bright spots, magnetic loops and fields, or non-radial pulsations. The surface intensity variations alter the radiative wind acceleration locally, which creates streams of faster and slower wind material. CIRs are responsible for the → discrete absorption components seen in some ultraviolet → resonance lines of → hot stars (S. R. Cranmer & S. P. Owocki, 1996, ApJ 462, 469).

corotate; → interaction; → region.

corotation
  هم‌چرخش   
hamcarxeš

Fr.: corotation   

The act of corotating.

Verbal noun of → corotate.

<< < -es -iv -ti 21 a p abe abs abs aca acc acc acr act ada adh Adr aer aga air Alf Alg alk Alp alt alu amm ana And ang ani ano ant ant Ap apo app app Aqu Arc arg arr asc ass ast ast asy atm ato att aur aut axi B-m bad Bal bar bar Bay Bed ber Bet bif bim bin bio bis bla ble blu Bod Bol bor bou Bra Bre bro bul C-t Cal Cam can car Car Cas cat cav cel cen cer Cha cha Cha che chl Cir cir cir Cla cli clo clu co- coc 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 Cre cri cro cub cur cyc cyl Dan dat Dav de- Deb dec dec dee def deg del Den den der det deu dew dic dif dif dil Dip dir dis dis dis dis dis diu dod Dop dou Dra dua dus dwa dyn DZ Ear ecc eco edi EHB Ein ela ele ele ele ele ell eme emp end Eng ent epi equ equ era ESP eth Eur evi exa exc exe exi exp exp ext ext ext fac fal far fec Fer fer fie fin fir fis fla Flo flu fog for for Fou fra fre fre Fro fun G s Gal gal gal Gar gau geg gen geo geo geo ger gla gly gra gra gra gra gra Gre gro GYR Had Hal hap Har HD hea hel hel Hen Her hex hig Hil hol Hoo hor hou Hub hum hyb hyd hyd hyp hys ide ign ima imp imp in- inc Ind ind ine inf inf inf ini ins ins ins int int int int Int int int int inv ion iri irr iso iso iso Jea Jor jum K c Kep Ker kin kno lab Lam Lan Lap las lat Le lef len lev lig lig lin lin lin liq Lit loc log lon lou LS lun lun Lym M s Mag mag mag mag mag mag maj man Mar mas mas mat May mea mec mel mer mes met met met mic mid mil Min Mir mix mod mod mol mon mor mov mul mur mys nan nat nav nec Nep neu New New NGC nob nom non non nor nos nuc nuc num nut obj obl obs occ oct off oli oni ope opp opt opt orb ord org orp osc out ove oxi P-w pal par par par par Pas pat pej per per per per per per pha Phe pho pho pho phy pin pla Pla pla pla pla plu poi pol pol Pol pol por pos pot Poy pre pre pre pre pri pri pri pro pro pro pro pro pro Psa pul pum Q i qua qua qua qua R A rad rad rad rad rad rad Ram Ran rat rea rea rec rec red red ref ref reg rei rel rel rem rep res res res ret rev Rho Rie ril riv rog Ros rot rul S A Sag sam sat sca sca Sch Sco Sec sec sec seg sel sem sen set Sha sha shi sho sid sig sim sin Sir ske sli Smo soc sof sol sol sol sol sou sou spa spe spe Spe spe sph spi Spi spr sta sta sta sta sta ste ste ste Sto str str sub sub sub suc sun sup sup sup sup sur swa syn syn tac tas tel tem ter tes the the the the thi thr tid til tip ton tor tou tra tra tra tra Tri tri tru tsu tur two Typ UHE ult unc uni uni uni upg 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 > >>