磁變星 的英文怎麼說
中文拼音 [cíbiànxīng]
磁變星
英文
magnetic variable star-
Many planets ( for example, ganymede, mercury, the earth, jupiter and saturn ) and stars ( for example, the sun ) possess intrinsic magnetic fields. the explanation for their existence and variation remains a great challenge to planetary scientists and astrophysicists. this article attempts to review some recent developments and difficulties in the study of magnetohydrodynamics for the electrically conducting fluid interiors of planets and stars. it is the fluid motions, usually driven by thermal convection, that generate and sustain magnetic fields through magnetohydrodynamic processes in planets and stars. in planets, the magnetohydrodynamic processes are strongly affected by the combined and inseparable effects of rotation, magnetic fields and spherical geometry. the key dynamics involves the interaction between the coriolis and lorentz forces. in the sun, it is the solar tachocline, a thin shear flow layer located at the base of the convection envelope, that plays an essential role in the solar magnetohydrodynamic processes which produce the 11 - year sunspot cycle. some results of a new nonlinear three - dimensional solar dynamo model are also presented
許多行星(如木衛三,水星,地球,木星和土星)和恆星(如太陽)具有內部磁場.對這些磁場的存在和變化的解釋對行星科學家和天體物理學家是一個巨大的挑戰.本文試圖總結行星和恆星的導電流體內部磁流體力學研究的新近發展和困難.一般由熱對流驅動的流動通過磁流體力學過程產生並維持在行星和恆星中的磁場.在行星中磁流體力學過程強烈地受到轉動,磁場和球幾何位型的綜合影響.其動力學的關鍵方面涉及科里奧利力和洛倫茲力間的相互作用.在太陽中其流線,即處于對流層的薄的剪切流層在太陽的磁流體力學過程中扮演了一個基本的角色,並由之產生了11年的太陽黑子周期.本文也給出了一個新的非線性三維太陽發電機模型The spin - down rate has been measured for almost every radio pulsar, and theory indicates that it depends on the strength of the star ' s magnetic field
這種自轉變慢的速率,幾乎每一顆無線電波霎都量得到,而理論指出,此速率和星體的磁場強度有關。If the moving fluid in a newborn neutron star also transfers a tenth of its kinetic energy to the magnetic field, then the field would grow stronger than 1015 gauss, which is more than 1, 000 times as strong as the fields of most radio pulsars
如果在新生中子星里的流體,也把10 %的動能轉變成磁場的話,磁場強度會上漲到超過1015高斯,這是大多數無線電波霎所帶磁場強度的1000倍以上。Value, and the current density and intensity versus the substorm phases. moreover, the characteristics of substorm current wedge are given special attention. it is found that the density and intensity of facs reach their peak during the expansion phase, the onset of the expansion phase is triggered when imf is changed to southward from northward or the southward imf decreases, and the positions of onset are most likely to be at the edge of plasma sheet near the earth
值分佈以及場向電流強度和密度隨亞暴位相的變化,並著重分析了亞暴電流楔的特徵。結果表明,亞暴膨脹相的場向電流強度和密度都達到極大值亞暴的膨脹相是由行星際磁場轉向或南向分量變小觸發的,其起始位置很可能位於近地等離子體片內邊緣。Magnetic cataclysmic variable
磁激變變星According to the direction and damping characteristic of the torque produced by the magnetorquers, the three axis attitude control schemes of gravity gradient satellite and other satellite with damper is presented. the control coefficients are determined by the dynamic characteristics of geomagnetic intensity, so the attitude control precision is improved
根據磁力矩在地磁場中的定向阻尼特性,提出了磁控重力梯度衛星和攜帶阻尼器的非重力梯度姿態控制規律,根據地磁場強度變化規律選擇控制系數,提高衛星的姿態控制精度。Deltan heliographers observe an irregularity in the magnetic cycle of the star delta. the shift of the stars magnetic polarity which usually occurs every 12 years has occurred 1 year early
德爾塔日光儀觀察到星球德爾塔的磁極周期不規則性變化;該星球每12年移動一次的磁極變化剛剛在一年前發生過。For an actual planetwide polarity reversal to occur, such a reversed flux patch would grow and engulf the entire polar region ; at the same time, a similar change in overall regional magnetic polarity would take place near the other geographic pole
如果整個行星的磁極要真的反轉,反向通量斑塊需擴大到涵蓋整個極區;同時,另一個地理極點附近也會發生類似的區域極性全面變化。The magnetic lines of force are in effect glued to the interstellar gas, and they follow the clouds in their capricious motions.
磁力線實際上是緊附在星際氣體上,並跟隨星際雲一道作著變化莫測的運動。Based on the viewpoint of interaction between waves in plasmas, the partial differential equation that causes the spectral lines broadening has been deduced from radiation transfer equation of high - frequency electromagnetic waves in plasmas. the numerical solution has been obtained by using the fortran program we compiled. we concretely calculated the spectral lines widths of and fraunhoferx 3704 in corona, fj / a4923. 9 in dwarf nova oy car and f. / a4934 in the variable star rr lyrae
本文從等離子體波與波相互作用觀點出發,由高頻電磁波輻射轉移方程導出了引起譜線寬度變化的偏微分方程,編寫fortran程序求解偏微分方程的數值解,具體計算了日冕綠線f _ exiv 5303和夫朗禾費線3704 、矮新星oycarf _ eii 4923 . 9 、天琴rr型變星f _ ei 4934的譜線加寬值,對以上各譜線加寬中的等離子體致寬效應作了初步計算。This is where a magnetic field changes shape and bumps into itself
這就是磁星的磁場改變了形狀然後向本身內部撞擊。Therefore soon after their supernova birth, their rotational speed will become so low that they stop to emit electromagnetic pulses
因此,超新星爆發后不久,磁星的自轉速度會變得非常緩慢,因而停止發放電磁脈沖。The science objectives involve high resolution imaging of the surface, studies of the topography and gravity, the role of water and dust on the surface and in the atmosphere of mars, the weather and climate of mars, the composition of the surface and atmosphere, and the existence and evolution of the martian magnetic field
此次發射的目標包括拍攝高解析度的火星表面圖片、研究火星地形和重力、水的狀態、地表和空氣中的塵埃、火星的氣候和天氣、土地和空氣的構成和火星磁場的存在和演變。Increased radiation from the sun and occurrence of geomagnetic storms i. e. severe distortion of geomagnetic field of the earth may cause disturbances such as increases in density in the earth s upper atmosphere. these result in a greater drag on the movement of satellites and spacecraft, causing a slow - down or even a change in orbit
輻射的增加及地磁暴即地球磁場急速變形的出現,會導致地球上層大氣的擾動,例如空氣密度的上升,從而使衛星和太空船在航行時受到的阻力大增,航行速度因而減慢,甚至軌道亦會改變。Increased radiation from the sun and occurrence of geomagnetic storms ( i. e. severe distortion of geomagnetic field of the earth ) may cause disturbances such as increases in density in the earth s upper atmosphere. these result in a greater drag on the movement of satellites and spacecraft, causing a slow - down or even a change in orbit
輻射的增加及地磁暴(即地球磁場急速變形)的出現,會導致地球上層大氣的擾動,例如空氣密度的上升,從而使衛星和太空船在航行時受到的阻力大增,航行速度因而減慢,甚至軌道亦會改變。Combined with the observational properties, we have constructed a theoretical model of a contact binary with a total mass of 1. 8 mo. our initial model is a detached binary in which the primary is very close to its roche lobe
並且由周期變化時標得到磁滯效應可能是引起wuma型相接雙星的角動量損失的主要物理機制。結合wuma型相接雙星的觀測特性,我們建立了一個總質量為1 . 8m 。Earlier this year gauthier hulot of the paris geophysical institute and his colleagues used satellite measurements to track changes in the field ' s behavior near the top of the core
今年( 2002 )年初,法國巴黎地球物理研究院的余洛和他的同事,利用衛星測量來追蹤接近地核表層的磁偶極場的變化。Pole shifts are a cataclysmic inversion of the planet ' s axis of rotation, up to 180 degrees ; a sudden slippage of the planet ' s solid crust around the molten core
磁極轉換是行星旋轉軸的大變動倒置,等於180度翻轉;在熔化的地核周圍行星固體外殼突然意外的滑移。Through the analysis of the attitude dynamic equation, the potential energy function is derived. the relationships of attitude varieties are derived from energy function and angle momentum equation and thus the attitude control laws of bias momentum satellite are put forward
通過對衛星姿態動力學方程分析,得出衛星的勢函數,結合衛星的勢函數和角動量方程導出各姿態之間變化關系,提出利用地磁場實現偏置動量輪衛星姿態穩定的控制規律。分享友人