High frequency ion sound waves - Nonlinear Processes in Geophysics
... dov et al., 1990; Karfidov and Lukina, 1997; McFarland and Wong, 1997; Vyacheslavov et al., 2002) as well as in numerical simulations (Degtyarev et al., 1980). Strong turbulence features of Langmuir wave packets were identified in the Jovian foreshock regions (Gurnett et al., 1981; Thiessen and Kell ...
... dov et al., 1990; Karfidov and Lukina, 1997; McFarland and Wong, 1997; Vyacheslavov et al., 2002) as well as in numerical simulations (Degtyarev et al., 1980). Strong turbulence features of Langmuir wave packets were identified in the Jovian foreshock regions (Gurnett et al., 1981; Thiessen and Kell ...
Construction and Operation of an Axion Helioscope
... ·2. The Sun as an axion source a) The arion spectrum If we confine our attention to hadronic axion models where these particles do not interact with electrons at tree level, they can be efficiently produced in the Sun only by processes involving their two photon coupling Eq. (4). In the interior of ...
... ·2. The Sun as an axion source a) The arion spectrum If we confine our attention to hadronic axion models where these particles do not interact with electrons at tree level, they can be efficiently produced in the Sun only by processes involving their two photon coupling Eq. (4). In the interior of ...
Part I - User Web Areas at the University of York
... The Solar Neutrino Problem In 2001 Sudbury Neutrino Observatory (SNO) in Canada detected all types of neutrinos coming from the Sun, and was able to distinguish between electron neutrinos and the other two flavours. It was found that about 35% of the arriving solar neutrinos are electron neutrinos, ...
... The Solar Neutrino Problem In 2001 Sudbury Neutrino Observatory (SNO) in Canada detected all types of neutrinos coming from the Sun, and was able to distinguish between electron neutrinos and the other two flavours. It was found that about 35% of the arriving solar neutrinos are electron neutrinos, ...
THE MEAN ELECTROMOTIVE FORCE FOR MHD TURBULENCE
... approach is the mean electromotive force which is determined by the fluctuations of the fluid velocity and the magnetic field. It describes several physical effects like -effect, turbulent diffusion of the magnetic field or turbulent diamagnetism. In many investigations on the kinematic level the m ...
... approach is the mean electromotive force which is determined by the fluctuations of the fluid velocity and the magnetic field. It describes several physical effects like -effect, turbulent diffusion of the magnetic field or turbulent diamagnetism. In many investigations on the kinematic level the m ...
Turbulence-driven Polar Winds from T Tauri Stars Energized by
... • Photospheric flux tubes are shaken (mainly horizontally) by these waves. • Alfvén waves propagate along the field, and partly reflect back down (non-WKB). • Nonlinear couplings allow a turbulent cascade to develop, terminated by damping. ...
... • Photospheric flux tubes are shaken (mainly horizontally) by these waves. • Alfvén waves propagate along the field, and partly reflect back down (non-WKB). • Nonlinear couplings allow a turbulent cascade to develop, terminated by damping. ...
Eclipse Box Activity Guide - Girl Scouts of Northern California
... need to obtain to do the activity. Mostly, the materials that you are asked to provide are the basics: paper, pens and pencils, cardboard boxes, aluminum foil, tape, etc. There are also activities that offer Girl Scouts the opportunity to use smartphones and digital cameras as sensors. The items pro ...
... need to obtain to do the activity. Mostly, the materials that you are asked to provide are the basics: paper, pens and pencils, cardboard boxes, aluminum foil, tape, etc. There are also activities that offer Girl Scouts the opportunity to use smartphones and digital cameras as sensors. The items pro ...
... Chondrites are meteorites that contain millimeter-sized objects called chondrules. In the 1960s and 70s, there was great hope that chondrules formed directly from the cloud of gas and dust that surrounded the Sun as it was still forming. The intellectual battle was between direct condensation from t ...
Bose-Einstein Condensation in a Constant Magnetic Field
... Thus, as BEC in 3D has the properties of a second order phase transition, in studying it in presence of a magnetic eld, the strong criterium cannot be applied; no critical temperature separating phases of dierent symmetry exists, and that was con rmed in many of the results of references [2]- [6]. ...
... Thus, as BEC in 3D has the properties of a second order phase transition, in studying it in presence of a magnetic eld, the strong criterium cannot be applied; no critical temperature separating phases of dierent symmetry exists, and that was con rmed in many of the results of references [2]- [6]. ...
The Absolute Chronology and Thermal Processing of Solids in the
... oldest chondrule age overlaps with our estimate of CAI formation and thus requires that aggregation of the chondrule precursor material and its thermal processing occurred within the uncertainty of its Pb-Pb age. Moreover, the age of the oldest chondrule indicates that it was not heated to temperatu ...
... oldest chondrule age overlaps with our estimate of CAI formation and thus requires that aggregation of the chondrule precursor material and its thermal processing occurred within the uncertainty of its Pb-Pb age. Moreover, the age of the oldest chondrule indicates that it was not heated to temperatu ...
Accretion to Stars with Non
... The measurements of the magnetic fields of rapidly rotating low-mass stars with the Zeeman-Doppler imaging technique have shown that in a number of stars the magnetic field has a complicated multipolar topology close to the star (Donati & Cameron 1997; Donati et al. 1999; Jardine et al. 2002). If th ...
... The measurements of the magnetic fields of rapidly rotating low-mass stars with the Zeeman-Doppler imaging technique have shown that in a number of stars the magnetic field has a complicated multipolar topology close to the star (Donati & Cameron 1997; Donati et al. 1999; Jardine et al. 2002). If th ...
UNIVERSITÀ DEGLI STUDI DI PADOVA Tesi di
... ThermoSolar Power Systems concentrate sunlight, usually with mirrors, to heat to high temperatures a uid that drives an engine. This approach diers from the one used by Photovoltaic Solar Power Systems, where light interacts directly with special materials to separate charges and generate electric ...
... ThermoSolar Power Systems concentrate sunlight, usually with mirrors, to heat to high temperatures a uid that drives an engine. This approach diers from the one used by Photovoltaic Solar Power Systems, where light interacts directly with special materials to separate charges and generate electric ...
The connection between stellar activity cycles and magnetic field
... activity have resulted from these types of observations including research into chromospheric and photometric variability (Lockwood et al. 2007) and the use of activity proxies as age indicators (Mamajek & Hillenbrand 2008; Pace 2013). Some authors have also studied possible trends involving the act ...
... activity have resulted from these types of observations including research into chromospheric and photometric variability (Lockwood et al. 2007) and the use of activity proxies as age indicators (Mamajek & Hillenbrand 2008; Pace 2013). Some authors have also studied possible trends involving the act ...
UAH
... How can it last from L=7 down to L=3? Minimal Theory: – Nose ions generate field-aligned potential at 1/2 of their total kinetic energy which extract the ions from deep within the ionosphere. – Space Charge ...
... How can it last from L=7 down to L=3? Minimal Theory: – Nose ions generate field-aligned potential at 1/2 of their total kinetic energy which extract the ions from deep within the ionosphere. – Space Charge ...
Timescales for the evolution of oxygen isotope compositions in the
... ciated with CO self-shielding, with a short discussion of mass-independent fractionation (MIF) in high-temperature CAI-forming reactions. The preliminary results for the oxygen isotopic composition of the solar wind from Genesis (McKeegan et al., 2008b) are not in agreement with supernova injection ...
... ciated with CO self-shielding, with a short discussion of mass-independent fractionation (MIF) in high-temperature CAI-forming reactions. The preliminary results for the oxygen isotopic composition of the solar wind from Genesis (McKeegan et al., 2008b) are not in agreement with supernova injection ...
Gravitational lensing in presence of plasma O.Yu. Tsupko G.S. Bisnovatyi-Kogan
... When we work in the frame of geometrical optics what is usual for gravitational lensing, we can characterize the properties of the medium by using of the refractive index. In the inhomogeneous medium (the refractive index depends explicitly on the space coordinates) the photon moves along curved tra ...
... When we work in the frame of geometrical optics what is usual for gravitational lensing, we can characterize the properties of the medium by using of the refractive index. In the inhomogeneous medium (the refractive index depends explicitly on the space coordinates) the photon moves along curved tra ...
arXiv:1705.00964v1 [astro-ph.GA] 2 May 2017
... hot stars. The rationale for specifying a radial orientation will become clear later. That the structures responsible for IDV must be elongated (i.e. statistically anisotropic) was pointed out by Barney Rickett (personal communication to MAW) soon after IDV was discovered in PKS0405-385 (Kedziora-Ch ...
... hot stars. The rationale for specifying a radial orientation will become clear later. That the structures responsible for IDV must be elongated (i.e. statistically anisotropic) was pointed out by Barney Rickett (personal communication to MAW) soon after IDV was discovered in PKS0405-385 (Kedziora-Ch ...
Probing magnetic fields with Square Kilometre array and its precursors
... confinement of cosmic rays to the launching and maintenance of galaxy outflows. In disk galaxies, magnetic fields contribute significantly to the total pressure of the interstellar gas while outflows from galaxies control the magnitude and structure of magnetic fields in galactic halos and could be ...
... confinement of cosmic rays to the launching and maintenance of galaxy outflows. In disk galaxies, magnetic fields contribute significantly to the total pressure of the interstellar gas while outflows from galaxies control the magnitude and structure of magnetic fields in galactic halos and could be ...
Sardinia_SA - Mullard Space Science Laboratory
... polars tend to emit at an approximately constant level, with occasional drops to fainter levels • There is a continuum of levels, but the states tend to be called “high”, “intermediate” and “low” • In low states the accretion rate drops, no reservoir in a disk, so the underlying stars can become vis ...
... polars tend to emit at an approximately constant level, with occasional drops to fainter levels • There is a continuum of levels, but the states tend to be called “high”, “intermediate” and “low” • In low states the accretion rate drops, no reservoir in a disk, so the underlying stars can become vis ...
Teil 2
... orbital motion, i.e., they appear centred at the central meridian during the respective quadrature phases, thus are not facing each other as would be the case for a hypothetical reflection effect. The leading hemispheres on both components appear with an effectively lower temperature than the traili ...
... orbital motion, i.e., they appear centred at the central meridian during the respective quadrature phases, thus are not facing each other as would be the case for a hypothetical reflection effect. The leading hemispheres on both components appear with an effectively lower temperature than the traili ...
The Birth Environment of the Solar System
... giant planets is estimated to be about 20 percent (although larger fractions, perhaps up to 50 percent, remain possible). At this time, detection of planets with masses comparable to Earth is just out of reach for main-sequence stars (due to technical limitations). As a result, it is too early to as ...
... giant planets is estimated to be about 20 percent (although larger fractions, perhaps up to 50 percent, remain possible). At this time, detection of planets with masses comparable to Earth is just out of reach for main-sequence stars (due to technical limitations). As a result, it is too early to as ...
COMETS
... looks blue because ions of carbon monoxide (CO+ ) within it fluoresce in the presence of sunlight. This emission peaks at about 420 nm. Ion tails are usually straight, contain a great deal of fine structure, and reach lengths roughly 10 times that of dust tails - up to 100 million km or more. The pl ...
... looks blue because ions of carbon monoxide (CO+ ) within it fluoresce in the presence of sunlight. This emission peaks at about 420 nm. Ion tails are usually straight, contain a great deal of fine structure, and reach lengths roughly 10 times that of dust tails - up to 100 million km or more. The pl ...
Interstellar neutral oxygen in a two-shock
... the atom and the ionized species. As a result, the relative abundances and the velocity distributions of the different species inside the heliosphere are different from the original interstellar abundances and velocity distributions. In fact there are two types of diagnostics in connection with the ...
... the atom and the ionized species. As a result, the relative abundances and the velocity distributions of the different species inside the heliosphere are different from the original interstellar abundances and velocity distributions. In fact there are two types of diagnostics in connection with the ...
Evolved, single, slowly rotating... but magnetically active
... is fainter (see Fig. 3), in agreement with the (cool) starspot hypothesis. The peak-to-peak V, V-I, and B-V amplitudes were 0.m 178±0.005, 0.m 050±0.003, and 0.m 040±0.003, respectively, and we note that such a relatively large V-I amplitude is typically only seen for the most active and most spotte ...
... is fainter (see Fig. 3), in agreement with the (cool) starspot hypothesis. The peak-to-peak V, V-I, and B-V amplitudes were 0.m 178±0.005, 0.m 050±0.003, and 0.m 040±0.003, respectively, and we note that such a relatively large V-I amplitude is typically only seen for the most active and most spotte ...
Is $^ 6$ Li in metal-poor halo stars produced in situ by solar
... studies, because the reaction 4 He(3 He, p)6 Li was not taken into account. Second, it is very likely that most halo stars were much more active in their youth than the contemporary Sun. Indeed stellar rotation being the decisive factor of solar-like activity of dwarf stars, magnetic braking during ...
... studies, because the reaction 4 He(3 He, p)6 Li was not taken into account. Second, it is very likely that most halo stars were much more active in their youth than the contemporary Sun. Indeed stellar rotation being the decisive factor of solar-like activity of dwarf stars, magnetic braking during ...
The evolution of the Sun`s birth cluster and the search for the solar
... siblings for which detailed chemical abundance studies should be undertaken in order to identify the true siblings. Our investigation is done by performing simulations of the evolution and disruption of the Sun’s birth cluster in a realistic (although static) Galactic potential, including the bar an ...
... siblings for which detailed chemical abundance studies should be undertaken in order to identify the true siblings. Our investigation is done by performing simulations of the evolution and disruption of the Sun’s birth cluster in a realistic (although static) Galactic potential, including the bar an ...
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.