ppt 3.8 Mb - Bogoliubov Laboratory of Theoretical Physics
... lower than the luminosities of all but one anomalous Xray pulsar. The properties of this pulsar prove that inferred dipolar magnetic field strength and period cannot alone be responsible for the unusual high-energy properties of the magnetars and create new challenges for understanding the possible ...
... lower than the luminosities of all but one anomalous Xray pulsar. The properties of this pulsar prove that inferred dipolar magnetic field strength and period cannot alone be responsible for the unusual high-energy properties of the magnetars and create new challenges for understanding the possible ...
Investigating the Zeeman Effect: A Deeper Look
... • Lines: the spectral line from the list presented in Table 1 to be observed. • Temperature: a hotter environment produces thermally broadened spectral lines. • Turbulent Velocity: turbulence adds non-thermal Doppler broadening to spectral lines. • Line-of-Sight Magnetic Field: the key parameter for ...
... • Lines: the spectral line from the list presented in Table 1 to be observed. • Temperature: a hotter environment produces thermally broadened spectral lines. • Turbulent Velocity: turbulence adds non-thermal Doppler broadening to spectral lines. • Line-of-Sight Magnetic Field: the key parameter for ...
Document
... • I will make hundreds of hours of new observations of M dwarfs to determine flare rates • I am creating model galaxy simulations to predict flare rates on a Galactic scale that includes spectral type and activity level. We can ‘observe’ this model to predict what LSST will see. ...
... • I will make hundreds of hours of new observations of M dwarfs to determine flare rates • I am creating model galaxy simulations to predict flare rates on a Galactic scale that includes spectral type and activity level. We can ‘observe’ this model to predict what LSST will see. ...
Neutron star to strange star - Institute of Physics, Bhubaneswar
... thereby establish them as NS and/or QS. Is it possible ? If not, the theorist have to come up with other models whose observable should be able to distinguish compact stars. New detectors with more accurate observations, one expects to measure such details, to open new frontiers in astrophysics. ...
... thereby establish them as NS and/or QS. Is it possible ? If not, the theorist have to come up with other models whose observable should be able to distinguish compact stars. New detectors with more accurate observations, one expects to measure such details, to open new frontiers in astrophysics. ...
The wind from the Sun: an introduction - LESIA
... curved shape of dust tails is produced by solar radiation pressure and gravity acting on the dust grains. But the gaseous tails raised an intriguing problem: they were observed to always point straight away from the Sun (with a slight aberration angle)5 and to exhibit irregularities that appeared to ...
... curved shape of dust tails is produced by solar radiation pressure and gravity acting on the dust grains. But the gaseous tails raised an intriguing problem: they were observed to always point straight away from the Sun (with a slight aberration angle)5 and to exhibit irregularities that appeared to ...
cohen_paris_v2_may2009 - Astronomy at Swarthmore College
... consistent with the predictions of the wind instability model. Photoelectric absorption’s effect on the profile shapes can be used as a mass-loss rate diagnostic: massloss rates are lower than previously thought. ...
... consistent with the predictions of the wind instability model. Photoelectric absorption’s effect on the profile shapes can be used as a mass-loss rate diagnostic: massloss rates are lower than previously thought. ...
how to protect your eyes from solar retinopathy
... is a rare phenomenon. In the Middle Ages, a solar eclipse was interpreted as the announcement of calamities. On August 11, 1999, a solar eclipse will occur in a large part of Europe, and will be total in the southern part of Belgium (south from an imaginary line between Bouillon and Arlon). More det ...
... is a rare phenomenon. In the Middle Ages, a solar eclipse was interpreted as the announcement of calamities. On August 11, 1999, a solar eclipse will occur in a large part of Europe, and will be total in the southern part of Belgium (south from an imaginary line between Bouillon and Arlon). More det ...
Damian and Jack 7K
... Core of the sun The core of the sun has a density one hundred and fifty times the density of the water on earth. The core has a temperate of 15.7 million kelvin (k) (or about 15,700,000 degrees Celsius). The inner core of the sun is basically the engine of the star and fuels the star. In the core o ...
... Core of the sun The core of the sun has a density one hundred and fifty times the density of the water on earth. The core has a temperate of 15.7 million kelvin (k) (or about 15,700,000 degrees Celsius). The inner core of the sun is basically the engine of the star and fuels the star. In the core o ...
Explosion of Sun - Scientific Research Publishing
... The Sun contains ~74% hydrogen by weight. The isotope hydrogen-1 (99.985% of hydrogen in nature) is a usable fuel for fusion thermonuclear reactions. This reaction runs slowly within the Sun because its temperature is low (relative to the needs of nuclear reactions). If we create higher temperature ...
... The Sun contains ~74% hydrogen by weight. The isotope hydrogen-1 (99.985% of hydrogen in nature) is a usable fuel for fusion thermonuclear reactions. This reaction runs slowly within the Sun because its temperature is low (relative to the needs of nuclear reactions). If we create higher temperature ...
Exercise Solutions
... first excited state. The Ca H and K lines are produced by singly-ionized Ca in the ground state. Thus, we must compare the number of neutral hydrogens with electrons in the first excited state to the number of CaC ions in their ground state. In 2.1.1 we estimated that in the solar surface H C =H ' ...
... first excited state. The Ca H and K lines are produced by singly-ionized Ca in the ground state. Thus, we must compare the number of neutral hydrogens with electrons in the first excited state to the number of CaC ions in their ground state. In 2.1.1 we estimated that in the solar surface H C =H ' ...
On the problem of very energetic flares in binary systems
... force due to the surface currents on the magnetic star, the second term the repulsion force of the other star and the third term the Lorentz force due to the background dipole field of moment m. In this geometry, the function H(x) varies, to first order, as 1/x3 . It must be noticed that this decrea ...
... force due to the surface currents on the magnetic star, the second term the repulsion force of the other star and the third term the Lorentz force due to the background dipole field of moment m. In this geometry, the function H(x) varies, to first order, as 1/x3 . It must be noticed that this decrea ...
The Birth and Evolution of Brown Dwarfs
... • Contrary to H activity, there is not a clear decline of radio emission for spectral types cooler than M8. The decline may be shifted to cooler temperatures. • Radio emission requires magnetic fields B~5-20 G, similar to Jupiter’s ...
... • Contrary to H activity, there is not a clear decline of radio emission for spectral types cooler than M8. The decline may be shifted to cooler temperatures. • Radio emission requires magnetic fields B~5-20 G, similar to Jupiter’s ...
IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE)
... A new method for increasing the light absorption that has emerged recently is the use of scattering from noble metal nano particles excited at their surface Plasmon resonance. The term „Plasmonics' refers to the science and technology dealing with manipulation of electromagnetic signals by coherent ...
... A new method for increasing the light absorption that has emerged recently is the use of scattering from noble metal nano particles excited at their surface Plasmon resonance. The term „Plasmonics' refers to the science and technology dealing with manipulation of electromagnetic signals by coherent ...
Name
... some of the other links if you have extra time. Click on the Egyptian link. 1. How is Re usually portrayed? 2. Where did we get the atmosphere and the clouds from? 3. How did Re create humans? 4. Click on Nut. Who did she marry? 5. Who helped her to have children? How? 6. Who were her four children? ...
... some of the other links if you have extra time. Click on the Egyptian link. 1. How is Re usually portrayed? 2. Where did we get the atmosphere and the clouds from? 3. How did Re create humans? 4. Click on Nut. Who did she marry? 5. Who helped her to have children? How? 6. Who were her four children? ...
Document
... the rotational velocity of the disk. The jet launched from the disk has a non-axisymmetric structure but the dependences of the jet velocity, mass outflow rate, and mass accretion rate on the magnetic field strength are similar to those in axisymmetric case. Basic Equation and Numerical Method Intro ...
... the rotational velocity of the disk. The jet launched from the disk has a non-axisymmetric structure but the dependences of the jet velocity, mass outflow rate, and mass accretion rate on the magnetic field strength are similar to those in axisymmetric case. Basic Equation and Numerical Method Intro ...
Rotation of the Sun - University of California, Berkeley
... and the Sun’s outer atmosphere becomes visible (in white light). We call it the Corona ...
... and the Sun’s outer atmosphere becomes visible (in white light). We call it the Corona ...
SGR and AXP – are they magnetars?
... to a neutron star with B_dipole~5x10^14 G as the source of the March 5 event. A very strong field can (i) spin down the star to an 8-s period in the ~10^4-yr age of the surrounding supernova remnant N49; (ii) provide enough energy for the March 5 event; (iii) undergo a large-scale interchange instab ...
... to a neutron star with B_dipole~5x10^14 G as the source of the March 5 event. A very strong field can (i) spin down the star to an 8-s period in the ~10^4-yr age of the surrounding supernova remnant N49; (ii) provide enough energy for the March 5 event; (iii) undergo a large-scale interchange instab ...
The intermediate scale anisotropy
... The 300 GeV - 3 TeV large-scale data form ARGO-YBj may provide essential informations about the local and galactic magnetic field. The observation of the intermediate scale excesses showed several interesting features still uninvestigated. Anyway, each model would imply deep revisions of the standar ...
... The 300 GeV - 3 TeV large-scale data form ARGO-YBj may provide essential informations about the local and galactic magnetic field. The observation of the intermediate scale excesses showed several interesting features still uninvestigated. Anyway, each model would imply deep revisions of the standar ...
SELF-TEST: True or False? 1. The Sun is a rather
... 3. The Sun's diameter is about 10 times that of Earth. HINT 4. The Sun's differential rotation indicates that it is not solid. HINT 5. In the solar radiation zone, the gas is partly ionized. HINT 6. Convection involves cool gas rising to the solar surface, and hot gas sinking into the interior. HINT ...
... 3. The Sun's diameter is about 10 times that of Earth. HINT 4. The Sun's differential rotation indicates that it is not solid. HINT 5. In the solar radiation zone, the gas is partly ionized. HINT 6. Convection involves cool gas rising to the solar surface, and hot gas sinking into the interior. HINT ...
Section_38_Dynamos_0..
... The initial condition consists of a circular flux tube. It is then stretched to larger diameter. Since both the volume of, and the flux in, the tube must be conserved (the flow is incompressible), the stretching increases the magnitude of the magnetic field in the tube. The twist and fold stages ret ...
... The initial condition consists of a circular flux tube. It is then stretched to larger diameter. Since both the volume of, and the flux in, the tube must be conserved (the flow is incompressible), the stretching increases the magnitude of the magnetic field in the tube. The twist and fold stages ret ...
Producing ultra-strong magnetic fields in neutron star mergers
... suggests that a compact object, either a neutron star or a stellar mass black hole acts as the central engine. The observed cosmological distances imply that large energies are involved and therefore, to avoid the so-called “compactness problem” (6), relativistic outflows with Lorentz-factors of sev ...
... suggests that a compact object, either a neutron star or a stellar mass black hole acts as the central engine. The observed cosmological distances imply that large energies are involved and therefore, to avoid the so-called “compactness problem” (6), relativistic outflows with Lorentz-factors of sev ...
Understanding of the role of magnetic fields: Galactic perspective
... can be generated by injecting light ions into a strongly rotating, heavy ion flow. The turbulence is expected to regenerate the poloidal field from the toroidal field and thereby close the feedback loop required for self-excitation. This suggests, that if the laboratory studies above are combined w ...
... can be generated by injecting light ions into a strongly rotating, heavy ion flow. The turbulence is expected to regenerate the poloidal field from the toroidal field and thereby close the feedback loop required for self-excitation. This suggests, that if the laboratory studies above are combined w ...
Solar cycle length and 20th Century northern hemisphere warming
... to be supported by interesting correlations with several pa- fact, they estimatea climatesensitivityof 0.4øC/WIn-2. leoclimate records and, separately, with the 20th century Becauseof this continuing interest in the relationship beNorthern Hemisphereinstrumental record. Actually, what tween SCL and ...
... to be supported by interesting correlations with several pa- fact, they estimatea climatesensitivityof 0.4øC/WIn-2. leoclimate records and, separately, with the 20th century Becauseof this continuing interest in the relationship beNorthern Hemisphereinstrumental record. Actually, what tween SCL and ...
East Valley Astronomy Club
... However, if the planets formed closer together, the Minimum Mass Solar Nebula must be wrong! The planets were spread out from 5-15 AU, not 5-30 AU. One quarter the area = 4 x denser!! ...
... However, if the planets formed closer together, the Minimum Mass Solar Nebula must be wrong! The planets were spread out from 5-15 AU, not 5-30 AU. One quarter the area = 4 x denser!! ...
Corona
A corona (Latin, 'crown') is an aura of plasma that surrounds the sun and other celestial bodies. The Sun's corona extends millions of kilometres into space and is most easily seen during a total solar eclipse, but it is also observable with a coronagraph. The word ""corona"" is a Latin word meaning ""crown"", from the Ancient Greek κορώνη (korōnē, “garland, wreath”).The high temperature of the Sun's corona gives it unusual spectral features, which led some in the 19th century to suggest that it contained a previously unknown element, ""coronium"". Instead, these spectral features have since been explained by highly ionized iron (Fe-XIV). Bengt Edlén, following the work of Grotrian (1939), first identified the coronal lines in 1940 (observed since 1869) as transitions from low-lying metastable levels of the ground configuration of highly ionised metals (the green Fe-XIV line at 5303 Å, but also the red line Fe-X at 6374 Å). These high stages of ionisation indicate a plasma temperature in excess of 1,000,000 kelvin, much hotter than the surface of the sun.Light from the corona comes from three primary sources, which are called by different names although all of them share the same volume of space. The K-corona (K for kontinuierlich, ""continuous"" in German) is created by sunlight scattering off free electrons; Doppler broadening of the reflected photospheric absorption lines completely obscures them, giving the spectral appearance of a continuum with no absorption lines. The F-corona (F for Fraunhofer) is created by sunlight bouncing off dust particles, and is observable because its light contains the Fraunhofer absorption lines that are seen in raw sunlight; the F-corona extends to very high elongation angles from the Sun, where it is called the zodiacal light. The E-corona (E for emission) is due to spectral emission lines produced by ions that are present in the coronal plasma; it may be observed in broad or forbidden or hot spectral emission lines and is the main source of information about the corona's composition.