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... Heasley (1976). Non-LTE calculations require various input data, such as a stellar atmosphere and a model atom which accounts for the relevant atomic properties. The resulting silicon abundances were derived with the program LINFOR, an updated and augmented Fortran version of the program by Baschek ...
... Heasley (1976). Non-LTE calculations require various input data, such as a stellar atmosphere and a model atom which accounts for the relevant atomic properties. The resulting silicon abundances were derived with the program LINFOR, an updated and augmented Fortran version of the program by Baschek ...
Modeling Solar Flare Hard X-ray Images and Spectra Observed with
... Observations obtained with the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) of a flare on February 20, 2002 indicate a hard X-ray (HXR) coronal source at or near the top of a flare loop (called a HXR looptop source). The existence of the HXR looptop source suggests that magnetic rec ...
... Observations obtained with the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) of a flare on February 20, 2002 indicate a hard X-ray (HXR) coronal source at or near the top of a flare loop (called a HXR looptop source). The existence of the HXR looptop source suggests that magnetic rec ...
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... field much more complex and stores magnetic energy. Once a flare occurs, the stored huge energy is released into the solar atmosphere in a short time. As a result of the energy release, a lot of phenomena are observed in various wavelengths; ejections of plasma, post-flare loops, nonthermal emission ...
... field much more complex and stores magnetic energy. Once a flare occurs, the stored huge energy is released into the solar atmosphere in a short time. As a result of the energy release, a lot of phenomena are observed in various wavelengths; ejections of plasma, post-flare loops, nonthermal emission ...
teach with space
... *Astronomical unit (AU): 1 AU is the average distance between the Earth and the Sun, or the Earth’s orbital radius, which is approximately 150 million km. *Gravitational perturbations: changes to the orbit of a celestial body (e.g. planet, comet) due to interactions with the gravitational fields of ...
... *Astronomical unit (AU): 1 AU is the average distance between the Earth and the Sun, or the Earth’s orbital radius, which is approximately 150 million km. *Gravitational perturbations: changes to the orbit of a celestial body (e.g. planet, comet) due to interactions with the gravitational fields of ...
4373 - Zuber, M. T., H. Y. McSween Jr., R. P. Binzel, L. T. Elkins
... the sun (Cameron 1988), and if so then >99% of the disk would have been gaseous and consisted of (mainly) hydrogen along with helium and other volatiles such as carbon monoxide and water. On the basis of observations of young stars, gas in the disk probably dispersed within a few million years (Hain ...
... the sun (Cameron 1988), and if so then >99% of the disk would have been gaseous and consisted of (mainly) hydrogen along with helium and other volatiles such as carbon monoxide and water. On the basis of observations of young stars, gas in the disk probably dispersed within a few million years (Hain ...
Solar Math - GLORIA Project
... millimeter, the diameter of the largest star VY Canis Majoris will be 2016 millimeters or about 2 meters! ...
... millimeter, the diameter of the largest star VY Canis Majoris will be 2016 millimeters or about 2 meters! ...
The Oort cloud as a remnant of the protosolar nebula
... described, we considered it best to terminate our numerical integration for a given cometary nucleus, when it is located at such distance r from the centre, where Mr = M . The rotation of the protosolar nebula is not considered because it is not significant during the period investigated. An additi ...
... described, we considered it best to terminate our numerical integration for a given cometary nucleus, when it is located at such distance r from the centre, where Mr = M . The rotation of the protosolar nebula is not considered because it is not significant during the period investigated. An additi ...
azu_etd_13224_sip1_m
... I NTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
... I NTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
Horace Welcome Babcock - National Academy of Sciences
... distance from the center of the system). He analyzed the velocities, advised by Lick astronomer R. J. Trumpler, and found that they did not match the rotation curve calculated for the constant mass-to-light ratio, then the usual assumption made for starlight. Upon converting his radial velocities to ...
... distance from the center of the system). He analyzed the velocities, advised by Lick astronomer R. J. Trumpler, and found that they did not match the rotation curve calculated for the constant mass-to-light ratio, then the usual assumption made for starlight. Upon converting his radial velocities to ...
The chemical composition of solar-type stars and its impact on the
... Planet search is usually conducted using two different methods, the radial velocity method and the transit one. In the radial velocity method, displacements of a star’s spectral lines are observed. This effect is caused by the star’s motion around the common center of mass of the star-planet system ...
... Planet search is usually conducted using two different methods, the radial velocity method and the transit one. In the radial velocity method, displacements of a star’s spectral lines are observed. This effect is caused by the star’s motion around the common center of mass of the star-planet system ...
$doc.title
... solar nebula. A nebula with a particular surface density distribution decreasing as 6(r ) ∼ r −3/2 with radius r , and just enough mass of refractory elements to form (with 100% efficiency) all Solar System planets and comets, is called the minimum solar nebula. Its mass is equal to1 0.02 M (or onl ...
... solar nebula. A nebula with a particular surface density distribution decreasing as 6(r ) ∼ r −3/2 with radius r , and just enough mass of refractory elements to form (with 100% efficiency) all Solar System planets and comets, is called the minimum solar nebula. Its mass is equal to1 0.02 M (or onl ...
Europium, Samarium, and Neodymium Isotopic Fractions in Metal
... abundances to the isotopic level, strengthening the r-process interpretation for HD 175305 and the s-process interpretation for HD 196944. Subject headings: atomic data — nuclear reactions, nucleosynthesis, abundances — stars: abundances — stars: Population II 1. INTRODUCTION ...
... abundances to the isotopic level, strengthening the r-process interpretation for HD 175305 and the s-process interpretation for HD 196944. Subject headings: atomic data — nuclear reactions, nucleosynthesis, abundances — stars: abundances — stars: Population II 1. INTRODUCTION ...
Present-day cosmic abundances - Dr. Karl Remeis
... An ideal alternative to find a reference for the chemical composition of cosmic matter are normal unevolved early B-type stars of ∼8-18 M⊙ , which can provide simultaneously temporal (present-day) and local (birth place) information on chemical abundances. They can be observed not only in the solar ...
... An ideal alternative to find a reference for the chemical composition of cosmic matter are normal unevolved early B-type stars of ∼8-18 M⊙ , which can provide simultaneously temporal (present-day) and local (birth place) information on chemical abundances. They can be observed not only in the solar ...
Chandra Characterization of X-ray Emission in the Young F
... The total program observing time was 39 ksec, and the total on-target observing time was 37.3 ksec, in which 1509 total raw photons were detected using a source extraction radius of 20ʺ and an energy filter in the range 0.3-2.0 keV. The extraction region was centered halfway between the two resolved ...
... The total program observing time was 39 ksec, and the total on-target observing time was 37.3 ksec, in which 1509 total raw photons were detected using a source extraction radius of 20ʺ and an energy filter in the range 0.3-2.0 keV. The extraction region was centered halfway between the two resolved ...
Advanced Composition Explorer
Advanced Composition Explorer (ACE) is a NASA Explorers program Solar and space exploration mission to study matter comprising energetic particles from the solar wind, the interplanetary medium, and other sources. Real-time data from ACE is used by the NOAA Space Weather Prediction Center to improve forecasts and warnings of solar storms. The ACE robotic spacecraft was launched August 25, 1997 and entered a Lissajous orbit close to the L1 Lagrangian point (which lies between the Sun and the Earth at a distance of some 1.5 million km from the latter) on December 12, 1997. The spacecraft is currently operating at that orbit. Because ACE is in a non-Keplerian orbit, and has regular station-keeping maneuvers, the orbital parameters at right are only approximate. The spacecraft is still in generally good condition in 2015, and is projected to have enough fuel to maintain its orbit until 2024. NASA Goddard Space Flight Center managed the development and integration of the ACE spacecraft.