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21 Congrès Français de Mécanique ...
... The study of flow of electrically conductive fluids, called magnetohydrodynamic (MHD) has attracted much attention due to its various applications. In astrophysics and geophysics, it is applied to the study of stellar structures, terrestrial cores and solar plasma. In industrial processes, it finds ...
... The study of flow of electrically conductive fluids, called magnetohydrodynamic (MHD) has attracted much attention due to its various applications. In astrophysics and geophysics, it is applied to the study of stellar structures, terrestrial cores and solar plasma. In industrial processes, it finds ...
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... been seen recently (Brandenburg et al. 2011), because significant scale separation is needed to overcome the effects of turbulent diffusion (Brandenburg et al. 2012). Mean-field considerations, however, have predicted the existence of NEMPI for a long time (Kleeorin et al. 1989, 1990, 1996; Kleeorin & ...
... been seen recently (Brandenburg et al. 2011), because significant scale separation is needed to overcome the effects of turbulent diffusion (Brandenburg et al. 2012). Mean-field considerations, however, have predicted the existence of NEMPI for a long time (Kleeorin et al. 1989, 1990, 1996; Kleeorin & ...
–1– 4. Energy transport in stars Stars are hotter at the centre, hence
... At the centre of the Sun, the heat transfer due to photons is much more efficient than that by electrons. This happens because although the electron heat capacity is larger than that of photons, the electrons have much smaller mean free path and thermal velocity, as a result, the electrons are less ...
... At the centre of the Sun, the heat transfer due to photons is much more efficient than that by electrons. This happens because although the electron heat capacity is larger than that of photons, the electrons have much smaller mean free path and thermal velocity, as a result, the electrons are less ...
Opacities and spectra of hydrogen atmospheres of moderately
... In addition, with decreasing B, the energy spectrum of the bound states of a magnetized atom becomes denser, which necessitates inclusion of more such states in the consideration. Meanwhile, since γ 1, the center-of mass motion of the atom noticeably affects the atomic properties. In order to cope ...
... In addition, with decreasing B, the energy spectrum of the bound states of a magnetized atom becomes denser, which necessitates inclusion of more such states in the consideration. Meanwhile, since γ 1, the center-of mass motion of the atom noticeably affects the atomic properties. In order to cope ...
Star Formation Triggers More Star Formation
... Fusion reactions begin as soon as the center of the protostar gets hot enough (~1 million K) Hydrogen to Helium fusion starts out slowly Heat doesn’t provide enough outward pressure to stop collapse. As core temperature goes up, fusion reactions happen faster. More energy = slower collapse. ...
... Fusion reactions begin as soon as the center of the protostar gets hot enough (~1 million K) Hydrogen to Helium fusion starts out slowly Heat doesn’t provide enough outward pressure to stop collapse. As core temperature goes up, fusion reactions happen faster. More energy = slower collapse. ...
Considerations on the use of atmospheric pressure plasma to generate complex molecular environments with relevance for molecular astrophysics
... A dielectric barrier discharge reactor was designed and constructed for this study in order to be coupled with the molecular beam mass spectrometer (HPR-60, Hiden Analytical). Two rectangular electrodes, supported by 1 mm thick glass discs and 0.74 mm gap, are used to generate the plasma in controll ...
... A dielectric barrier discharge reactor was designed and constructed for this study in order to be coupled with the molecular beam mass spectrometer (HPR-60, Hiden Analytical). Two rectangular electrodes, supported by 1 mm thick glass discs and 0.74 mm gap, are used to generate the plasma in controll ...
Chapter1
... so-called coupling schemes of momenta, have been used, among which the widest use has the LS - coupling. According to this scheme the atomic states have different values of L (the total atomic orbital momentum) and S (the total atomic spin). The rule of momentum addition we shall illustrate by the ex ...
... so-called coupling schemes of momenta, have been used, among which the widest use has the LS - coupling. According to this scheme the atomic states have different values of L (the total atomic orbital momentum) and S (the total atomic spin). The rule of momentum addition we shall illustrate by the ex ...
Figure 1 - Research
... going into the heliosphere. • There is a cyclic variation: n is highest soon after sunspot maxima and smallest during sunspot minima. This is partly due to the solar cycle variation of the heliospheric magnetic field, partly due to the varying proximity to the heliospheric currecnt sheet. During sun ...
... going into the heliosphere. • There is a cyclic variation: n is highest soon after sunspot maxima and smallest during sunspot minima. This is partly due to the solar cycle variation of the heliospheric magnetic field, partly due to the varying proximity to the heliospheric currecnt sheet. During sun ...
The influence of negatively charged, heavier
... has already been carried out, the parameter space was restricted to get the equations in a compact form. A complete numerical study would thus extend our analytical results while at the same time exploring a larger parameter space. Second Phase: We also propose to extend our investigations on the st ...
... has already been carried out, the parameter space was restricted to get the equations in a compact form. A complete numerical study would thus extend our analytical results while at the same time exploring a larger parameter space. Second Phase: We also propose to extend our investigations on the st ...
pptx - Particle Physics and Particle Astrophysics
... • Integrating over a distribution of electron energies gives a flat spectrum for thermal, a power law for relativistic electrons ...
... • Integrating over a distribution of electron energies gives a flat spectrum for thermal, a power law for relativistic electrons ...
If neutron star is born with a strong magnetic field
... Magnetic field decay • Vandakurov et al (1972) proposed that convective instabilities could take place in the degenerate interior of a neutron star. The flux tubes would become buoyant (Parker 1979) and rise rapidly on the time ~1s until they reach the crust. • Muslimov & Tsygan (1985) assumed that ...
... Magnetic field decay • Vandakurov et al (1972) proposed that convective instabilities could take place in the degenerate interior of a neutron star. The flux tubes would become buoyant (Parker 1979) and rise rapidly on the time ~1s until they reach the crust. • Muslimov & Tsygan (1985) assumed that ...
Discovery Of A Magnetic Field In The O9 Sub-Giant Star HD
... is provided in Fig. 5). A careful examination of the corresponding reduced spectrum clearly shows the presence of Stokes V signatures of similar morphology in numerous individual absorption lines of different chemical species. We also list the false alarm probabilities according to the criterion of ...
... is provided in Fig. 5). A careful examination of the corresponding reduced spectrum clearly shows the presence of Stokes V signatures of similar morphology in numerous individual absorption lines of different chemical species. We also list the false alarm probabilities according to the criterion of ...
zaneposter
... al, 2000. Different curves are for different values of magnetic field and effective temperature. The fraction of polarization strongly depends on the energy band and shows a variety of different behaviors. Its sign is determined by the competition between plasma and vacuum properties in the photosph ...
... al, 2000. Different curves are for different values of magnetic field and effective temperature. The fraction of polarization strongly depends on the energy band and shows a variety of different behaviors. Its sign is determined by the competition between plasma and vacuum properties in the photosph ...
Black Hole`` Systems.`
... A rotating intrinsic magnetic field (shown in pale yellow) anchored to the MECO generates a magnetic propeller, sweeping out a large region (shown in black) of the inner accretion disk. The magnetic propeller also creates radial outflows of atomic nuclei (shown in indigo blue) and relativistic j ...
... A rotating intrinsic magnetic field (shown in pale yellow) anchored to the MECO generates a magnetic propeller, sweeping out a large region (shown in black) of the inner accretion disk. The magnetic propeller also creates radial outflows of atomic nuclei (shown in indigo blue) and relativistic j ...
Statistics of the Interplanetary Magnetic Fields Observed at 0.72 AU
... The time series of the increments of B are best described quantitatively and statistically by PDFs. All the PDFs are peaked and have large tails, which can be described quantitatively by Tsallis distribution function. The two parameters of Tsallis distribution, w and q, measure the width and tails o ...
... The time series of the increments of B are best described quantitatively and statistically by PDFs. All the PDFs are peaked and have large tails, which can be described quantitatively by Tsallis distribution function. The two parameters of Tsallis distribution, w and q, measure the width and tails o ...
Neutron Stars – Thermal Emitters
... component related to the NS cooling is apparent in a few sources, an additional component with a higher temperature and a smaller emitting area can also be observed (De Luca et al. 2005), probably related to re-heating of the magnetic polar caps by bombardment of magnetospheric particles. We note th ...
... component related to the NS cooling is apparent in a few sources, an additional component with a higher temperature and a smaller emitting area can also be observed (De Luca et al. 2005), probably related to re-heating of the magnetic polar caps by bombardment of magnetospheric particles. We note th ...
Electric Currents – The Key to Magnetic Fields
... In descriptions that ignore the involvement of currents in plasma phenomena several questions always remain unasked (and therefore unaddressed). Basically, we must ask what causes magnetic fields to move or change strength? For example, in attempts to explain the cause of solar flares and coronal ma ...
... In descriptions that ignore the involvement of currents in plasma phenomena several questions always remain unasked (and therefore unaddressed). Basically, we must ask what causes magnetic fields to move or change strength? For example, in attempts to explain the cause of solar flares and coronal ma ...
A novel mechanism for electron-cyclotron maser
... Another important instability driven by a fast electron beam is the Langmuir wave (LW) instability, which usually has a much faster growth rate than that of the AW instability. However, this does not imply that the LW instability is more important than the AW instability. The propagation of the LW c ...
... Another important instability driven by a fast electron beam is the Langmuir wave (LW) instability, which usually has a much faster growth rate than that of the AW instability. However, this does not imply that the LW instability is more important than the AW instability. The propagation of the LW c ...
Cosmic Rays and Plasma Astrophysics
... fundamental new particles, the theoretical foundations of electromagnetic theory and the seeds of quantum mechanics and relativity. Various types of “rays” were found, many using “Crooke’s tubes,” an evacuated tube in which a high voltage could be applied. Röntgen found in 1895 that photographic pla ...
... fundamental new particles, the theoretical foundations of electromagnetic theory and the seeds of quantum mechanics and relativity. Various types of “rays” were found, many using “Crooke’s tubes,” an evacuated tube in which a high voltage could be applied. Röntgen found in 1895 that photographic pla ...
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... and the current in the secondary also ceases at the same pace, essentially energy is conserved. Additionally due to increase in the current in the primary a steady current or voltage is established in secondary during ton(equation A4, Figure 2)). Since the currents in primary and secondary are in op ...
... and the current in the secondary also ceases at the same pace, essentially energy is conserved. Additionally due to increase in the current in the primary a steady current or voltage is established in secondary during ton(equation A4, Figure 2)). Since the currents in primary and secondary are in op ...
The Ionization Parameter A convenient way of thinking about the
... can be longer than the timescale for a collisional excitation or hydrogen ionization. Thus the use of Te to describe the distribution of electron speeds may be incorrect. 3) Electrons which have been photo-ionized with high energy photons can have velocities high enough to collisionally ionize hydro ...
... can be longer than the timescale for a collisional excitation or hydrogen ionization. Thus the use of Te to describe the distribution of electron speeds may be incorrect. 3) Electrons which have been photo-ionized with high energy photons can have velocities high enough to collisionally ionize hydro ...
Magnetic field and convection in Betelgeuse
... (ESPaDOnS/NARVAL : about 15% including sky & detector) use large reflectors (ESPaDOnS/HARPSpol : 4m) perform accurate polarimetric analysis ...
... (ESPaDOnS/NARVAL : about 15% including sky & detector) use large reflectors (ESPaDOnS/HARPSpol : 4m) perform accurate polarimetric analysis ...
The integral magnetic field of 53 Cam - an effect of ring
... Here we use the fourth component as the factor, which is related to the topographic element density on the surface, represented as a cartographic map. The magnetic field is calculated using the MCD-method proposed by Gerth and Glagolevskij (2000, 2001). Nevertheless, this is not the only possible wa ...
... Here we use the fourth component as the factor, which is related to the topographic element density on the surface, represented as a cartographic map. The magnetic field is calculated using the MCD-method proposed by Gerth and Glagolevskij (2000, 2001). Nevertheless, this is not the only possible wa ...
Energy conservation and Poynting`s theorem
... volume V, and l and are, respectively, the permeability and permittivity. In Poynting’s words, Eq. (1) means that “we must no longer consider a current as something conveying energy along the conductor. A current in a conductor is rather to be regarded as consisting essentially of a convergence of ...
... volume V, and l and are, respectively, the permeability and permittivity. In Poynting’s words, Eq. (1) means that “we must no longer consider a current as something conveying energy along the conductor. A current in a conductor is rather to be regarded as consisting essentially of a convergence of ...
Polywell
The polywell is a type of nuclear fusion reactor that uses an electric field to heat ions to fusion conditions. It is closely related to the magnetic mirror, the fusor, the biconic cusp and the high beta fusion reactor. A set of electromagnets generates a magnetic field which traps electrons. This creates a negative voltage, which attracts positive ions. As the ions accelerate towards the negative center, their kinetic energy rises. If the ions collide in the center, they can fuse.The polywell is one of many devices that use an electric field to heat ions to fusion conditions. This branch of fusion research is known as inertial electrostatic confinement. The polywell was developed by Robert Bussard, as an improvement over the fusor. His company, EMC2, Inc., developed the initial devices for the U.S. Navy.