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: 7 Search : bipolar
ambipolar
  اوبا قطبی   
ubâqotbi

Fr.: ambipolaire   

1) Applying equally to both positive and negative ions.
2) Operating in two opposite directions simultaneously. → bipolar.

Ambipolar, from → ambi- + → polar.

ambipolar diffusion
  پخش ِ اوبا قطبی   
paxš-e ubâqotbi

Fr.: diffusion ambipolaire   

A physical process which allows a → molecular cloud to decouple from → interstellar magnetic field in order to undergo → gravitational collapse. A cloud of pure molecular gas would form stars very fast through collapse since neutral matter does not respond to the magnetic field. However, the magnetic field holds up a collapse because the ions present in the cloud collide with the neutrals and tie them to the field. The collapse can then only proceed if the magnetic field can be separated from the gas. In denser molecular cores the ionization degree decreases substantially and therefore neutrals and ions decouple.

ambipolar; → diffusion.

bipolar
  دوقطبی   
doqotbi (#)

Fr.: bipolaire   

Having two poles; having two opposite main structures or components.

Bipolar, from → bi- + → polar, from → pole.

Doqotbi, from do-, → bi-, + qotbi, → polar, from qotb, → pole.

bipolar flow
  تچان ِ دوقطبی   
tacân-e doqotbi

Fr.: flot bipolaire   

Same as → bipolar outflow.

bipolar; → flow.

bipolar jet
  شان ِ دوقطبی   
šân-e doqotbi

Fr.: jet bipolaire   

One of two beams of high-temperature, ionized gas ejected in two opposite directions associated with a → protostar. The collimated jets, a consequence of the → accretion process, can extend over distances of several → light-years.

bipolar; → jet.

bipolar nebula
  میغ ِ دوقطبی   
miq-e doqotbi

Fr.: nébuleuse bipolaire   

An interstellar cloud of ionized gas with two main lobes which lie symmetrically on either side of a central star. The bipolar shape is generally due to the ejection of material by the central star in opposing directions.

bipolar; → nebula.

bipolar outflow
  ا ُستچان ِ دوقطبی   
ostacân-e doqotbi

Fr.: flot bipolaire   

A flow of gaseous material in two opposite directions emanating from protostellar regions or from → evolved stars during the early post-→ AGB evolution. In protostellar regions → molecular outflows are pushed by → bipolar jets.

bipolar; → outflow.

Ostacân, → outflow; doqotbibipolar.