Light perturbation from stellar non radial oscillations: an application
... • Taking into account sphericity of the photosphere reveals a possible significant increase of the relative intensity perturbation at the solar limb for some modes of oscillation: - both for p and g-modes - and only for l+m even modes • The effect on the full-disk perturbation is expected to be smal ...
... • Taking into account sphericity of the photosphere reveals a possible significant increase of the relative intensity perturbation at the solar limb for some modes of oscillation: - both for p and g-modes - and only for l+m even modes • The effect on the full-disk perturbation is expected to be smal ...
Estimation of picked-up lunar ions for future compositional remote SIMS
... ing of the lunar surface has also been suggested to contribute subsidiarily to creation of the lunar Na atmosphere by enhancing diffusion of Na to the ground surface. Laboratory work also concluded that a photon-stimulated process could achieve a yield and kinetic temperature of the Na atmosphere co ...
... ing of the lunar surface has also been suggested to contribute subsidiarily to creation of the lunar Na atmosphere by enhancing diffusion of Na to the ground surface. Laboratory work also concluded that a photon-stimulated process could achieve a yield and kinetic temperature of the Na atmosphere co ...
Katya Georgieva: Solar dynamo theory – recent progress, questions
... the pole = lower polar field = lower following sunspot max ...
... the pole = lower polar field = lower following sunspot max ...
Sample pages 1 PDF
... visual observing. Telescopes of this type designed for serious imaging of the night sky are available in apertures of 200 mm and above, but catadioptrics designed for visual observing and short-exposure photography are also available in smaller apertures. Widely advertised models of these small tele ...
... visual observing. Telescopes of this type designed for serious imaging of the night sky are available in apertures of 200 mm and above, but catadioptrics designed for visual observing and short-exposure photography are also available in smaller apertures. Widely advertised models of these small tele ...
Comets and astrobiology
... protosolar nebula, where the temperature was low enough for water ice to condense, embedding “dust” particles made of organic and/ or mineral material. The resulting “dirty snowball” is the nucleus of the comet, with typical sizes of 1 to 100 km: the nucleus of the famous comet 1P/Halley has an irre ...
... protosolar nebula, where the temperature was low enough for water ice to condense, embedding “dust” particles made of organic and/ or mineral material. The resulting “dirty snowball” is the nucleus of the comet, with typical sizes of 1 to 100 km: the nucleus of the famous comet 1P/Halley has an irre ...
The Kuiper Belt
... Trujillo, and David Rabinowitz) announced the NASA-sponsored discovery of a very large planetary body (originally designated 2003 VB12) in one of the most distant planetary orbits yet discovered within the Solar System. Confirmed by the Spitzer (infrared) Space Telescope and tentatively named Sedna ...
... Trujillo, and David Rabinowitz) announced the NASA-sponsored discovery of a very large planetary body (originally designated 2003 VB12) in one of the most distant planetary orbits yet discovered within the Solar System. Confirmed by the Spitzer (infrared) Space Telescope and tentatively named Sedna ...
Seismic Observations of the Solar Interior
... no diffusive mixing of material outside the convection zone, no segregation of chemical elements, no wave transport of material or energy, no mass loss nor accretion, no magnetic fields, hydrostatic balance, thermal balance, sun spherically symmetrical throughout its evolution, age known, Newtonian ...
... no diffusive mixing of material outside the convection zone, no segregation of chemical elements, no wave transport of material or energy, no mass loss nor accretion, no magnetic fields, hydrostatic balance, thermal balance, sun spherically symmetrical throughout its evolution, age known, Newtonian ...
Ong page 1 of VHE astro
... HE g from inverse Compton or proton cascade in jets? Six g sources from EGRET. Want to see pulsed VHE g signal. e.g. Crab nebula powered by central pulsar determine mechanism and nebular magnetic field g from in shock wave, maybe also p0 decay? bursts of gamma rays lasting 10 msec to 1000 sec, some ...
... HE g from inverse Compton or proton cascade in jets? Six g sources from EGRET. Want to see pulsed VHE g signal. e.g. Crab nebula powered by central pulsar determine mechanism and nebular magnetic field g from in shock wave, maybe also p0 decay? bursts of gamma rays lasting 10 msec to 1000 sec, some ...
Spot sizes on Sun-like stars
... Doppler imaging are prone to underestimating spot areas. This is mainly because they are not very sensitive to rotationally invariant surface features, e.g. banded structures or low-level and small-scale distributed surface features. The current resolution limit of Doppler imaging is 3◦ to 5◦ in lon ...
... Doppler imaging are prone to underestimating spot areas. This is mainly because they are not very sensitive to rotationally invariant surface features, e.g. banded structures or low-level and small-scale distributed surface features. The current resolution limit of Doppler imaging is 3◦ to 5◦ in lon ...
Numerical models of sunspot formation and fine structure
... part of the dynamo itself, it is typically modelled independently owing to the vast difference in the time and length scales involved. Substantial progress in modelling capabilities over the past decade has enabled a transition towards three-dimensional models incorporating the effects of convection ...
... part of the dynamo itself, it is typically modelled independently owing to the vast difference in the time and length scales involved. Substantial progress in modelling capabilities over the past decade has enabled a transition towards three-dimensional models incorporating the effects of convection ...
on the nature of the dust in the debris disk around hd 69830
... that is 5385 K (Lovis et al. 2006), we estimate a location for the dust at 0.93Y1.16 AU from HD 69830. This range of distances is coincident with the strong 2:1 and 5:2 mean motion resonances of HD 69830d predicted by Lovis et al. (2006) from their Monte Carlo modeling of stable dust particle orbits ...
... that is 5385 K (Lovis et al. 2006), we estimate a location for the dust at 0.93Y1.16 AU from HD 69830. This range of distances is coincident with the strong 2:1 and 5:2 mean motion resonances of HD 69830d predicted by Lovis et al. (2006) from their Monte Carlo modeling of stable dust particle orbits ...
Theoretical Predictions for Mass Loss Rates: Rotation & Pulsation
... What sets the Sun’s mass loss? • Coronal heating must be ultimately responsible. ...
... What sets the Sun’s mass loss? • Coronal heating must be ultimately responsible. ...
Chapter 15--Our Sun - Geological Sciences
... enter the solar corona, the tenuous uppermost layer of the Sun’s atmosphere (Figure 15.4). Here you find the temperature to be astonishingly high—about 1 million Kelvin. This region emits most of the Sun’s X rays. However, the density here is so low that your spaceship feels relatively little heat d ...
... enter the solar corona, the tenuous uppermost layer of the Sun’s atmosphere (Figure 15.4). Here you find the temperature to be astonishingly high—about 1 million Kelvin. This region emits most of the Sun’s X rays. However, the density here is so low that your spaceship feels relatively little heat d ...
The Sun - challenge for scientists
... ● Two main focus areas of the modern solar science ♦ Understanding of the physical mechanisms of the solar dynamics and magnetism. Determination of ways by which the energy generated in the Sun’s core is released into space Detailed study of interaction of the solar plasmas and magnetic field. Theor ...
... ● Two main focus areas of the modern solar science ♦ Understanding of the physical mechanisms of the solar dynamics and magnetism. Determination of ways by which the energy generated in the Sun’s core is released into space Detailed study of interaction of the solar plasmas and magnetic field. Theor ...
Spectral properties, magnetic fields, and dust transport at lunar swirls
... near-surface field strength can help constrain the volume magnetization and distribution of magnetized material, which in turn relates to how the anomaly formed. Previously, only inversions from orbital spacecraft data collected above 20 km have been used to constrain the near-surface field strength ...
... near-surface field strength can help constrain the volume magnetization and distribution of magnetized material, which in turn relates to how the anomaly formed. Previously, only inversions from orbital spacecraft data collected above 20 km have been used to constrain the near-surface field strength ...
Document
... The magnetic flux, accumulated on the horizon of an IBH because of accretion of interstellar matter, allows the Blandford–Znajeck mechanism to be activated. So, electron–positron jets can be launched. Such jets are feasible electron accelerator which, in molecular clouds, allows electron energy to b ...
... The magnetic flux, accumulated on the horizon of an IBH because of accretion of interstellar matter, allows the Blandford–Znajeck mechanism to be activated. So, electron–positron jets can be launched. Such jets are feasible electron accelerator which, in molecular clouds, allows electron energy to b ...
A dust ring around Epsilon Eridani: analogue to the young Solar
... The central deficit of emission suggests accumulation of dust into planetesimals (which emit much less per unit mass than individual grains). The ǫ Eri system could thus be analogous to the young Solar System, seen when planet formation is ongoing or complete, but some dust is still present at all r ...
... The central deficit of emission suggests accumulation of dust into planetesimals (which emit much less per unit mass than individual grains). The ǫ Eri system could thus be analogous to the young Solar System, seen when planet formation is ongoing or complete, but some dust is still present at all r ...
Comparison of the expected and observed supernova remnant
... surrounding dense clouds or in the form of the high-energy particles, accelerated within the remnant. Once escaped, these energetic particles can travel over galactic distances, diffusing in the galactic magnetic fields. These particles are commonly attributed to the galactic part of Cosmic Rays (CR ...
... surrounding dense clouds or in the form of the high-energy particles, accelerated within the remnant. Once escaped, these energetic particles can travel over galactic distances, diffusing in the galactic magnetic fields. These particles are commonly attributed to the galactic part of Cosmic Rays (CR ...
IBEX
... What is the solar wind? The solar wind is a stream of charged particles (plasma) that flow off the Sun at about one million miles per hour (400 kilometers per second)! These particles come from the outermost layer of the Sun, called the corona. ...
... What is the solar wind? The solar wind is a stream of charged particles (plasma) that flow off the Sun at about one million miles per hour (400 kilometers per second)! These particles come from the outermost layer of the Sun, called the corona. ...
OXYGEN IN THE SOLAR SYSTEM
... silicate dust sequestered about 14% of the total solar oxygen, while only ~1% was tied up as dust composed of the primitive CAIs found in chondrite meteorites. It is assumed that a steady-state distribution of oxygen is established between the gas and dust of the interstellar medium. We do not consi ...
... silicate dust sequestered about 14% of the total solar oxygen, while only ~1% was tied up as dust composed of the primitive CAIs found in chondrite meteorites. It is assumed that a steady-state distribution of oxygen is established between the gas and dust of the interstellar medium. We do not consi ...
Physics case for Antares+
... all efforts, up to now no high-energy neutrino from outside the Earth’s atmosphere has been identified. It is generally recognised that even the discovery of a few astrophysical neutrino events would be a major discovery. In this respect, KM3NET will allow to explore with unprecedented sensitivity a ...
... all efforts, up to now no high-energy neutrino from outside the Earth’s atmosphere has been identified. It is generally recognised that even the discovery of a few astrophysical neutrino events would be a major discovery. In this respect, KM3NET will allow to explore with unprecedented sensitivity a ...
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.