The Experts below are selected from a list of 78 Experts worldwide ranked by ideXlab platform
John F. Kerridge - One of the best experts on this subject based on the ideXlab platform.
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long term compositional variation in solar Corpuscular Radiation evidence from nitrogen isotopes in the lunar regolith
Reviews of Geophysics, 1993Co-Authors: John F. KerridgeAbstract:Implantation of solar Corpuscular Radiation into the lunar surface generates a population of solar atoms in the rims of lunar regolith grains. Laboratory analysis of those atoms can yield a measure of solar composition. Nitrogen trapped in the lunar regolith consists of at least two components, putatively originating in the Sun, differing in release temperature and therefore probably in implantation energy. The higher-energy component is depleted in 15N relative to the lower-energy component by amounts that range up to at least 20%. These components superficially resemble those identified previously in the solar-derived light noble gases, though with several marked differences. Thus the higher-energy noble gas components are depleted in the lighter isotope. Unlike the noble gas case, the 15N/14N ratios of both N components vary with antiquity in a complex fashion; the lower-energy component echoes the variations in the higher-energy component which dominate the isotopic evolution of the bulk samples. The magnitude of the bulk sample variation exceeds 30%; the higher-energy component varies by at least 25%. The bulk long-term trend in 15N/14N does not result from variations in mixing ratio of the two components. Both the compositional difference between the components and the long-term variations within them apparently originate in the Sun, though this conclusion is inconsistent with current understanding of solar structure and evolution. The nitrogen isotopic record therefore appears to represent a major challenge to solar physics.
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Long‐term compositional variation in solar Corpuscular Radiation: Evidence from nitrogen isotopes in the lunar regolith
Reviews of Geophysics, 1993Co-Authors: John F. KerridgeAbstract:Implantation of solar Corpuscular Radiation into the lunar surface generates a population of solar atoms in the rims of lunar regolith grains. Laboratory analysis of those atoms can yield a measure of solar composition. Nitrogen trapped in the lunar regolith consists of at least two components, putatively originating in the Sun, differing in release temperature and therefore probably in implantation energy. The higher-energy component is depleted in 15N relative to the lower-energy component by amounts that range up to at least 20%. These components superficially resemble those identified previously in the solar-derived light noble gases, though with several marked differences. Thus the higher-energy noble gas components are depleted in the lighter isotope. Unlike the noble gas case, the 15N/14N ratios of both N components vary with antiquity in a complex fashion; the lower-energy component echoes the variations in the higher-energy component which dominate the isotopic evolution of the bulk samples. The magnitude of the bulk sample variation exceeds 30%; the higher-energy component varies by at least 25%. The bulk long-term trend in 15N/14N does not result from variations in mixing ratio of the two components. Both the compositional difference between the components and the long-term variations within them apparently originate in the Sun, though this conclusion is inconsistent with current understanding of solar structure and evolution. The nitrogen isotopic record therefore appears to represent a major challenge to solar physics.
A Mazzarella - One of the best experts on this subject based on the ideXlab platform.
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the 60 year solar modulation of global air temperature the earth s rotation and atmospheric circulation connection
Theoretical and Applied Climatology, 2007Co-Authors: A MazzarellaAbstract:Spectral analysis of geomagnetic activity, global air temperature, Earth’s rotation rate and zonal circulation, when smoothed from secular trend and periods shorter than 23 years, shows a concentration of energy around the 60-year period explaining more than 80% of the entire variance. This information has enabled the set-up of a cascade physical model that integrates the Sun-atmosphere-Earth system as a single unit and ties solar Corpuscular Radiation to global warming through Earth’s rotation and atmospheric circulation. Our results suggest that changes in geomagnetic activity, and in the Earth’s rotation, could be used as long- and short-term indicators, respectively, of future changes in global air temperature.
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The 60-year solar modulation of global air temperature: the Earth’s rotation and atmospheric circulation connection
Theoretical and Applied Climatology, 2007Co-Authors: A MazzarellaAbstract:Spectral analysis of geomagnetic activity, global air temperature, Earth’s rotation rate and zonal circulation, when smoothed from secular trend and periods shorter than 23 years, shows a concentration of energy around the 60-year period explaining more than 80% of the entire variance. This information has enabled the set-up of a cascade physical model that integrates the Sun-atmosphere-Earth system as a single unit and ties solar Corpuscular Radiation to global warming through Earth’s rotation and atmospheric circulation. Our results suggest that changes in geomagnetic activity, and in the Earth’s rotation, could be used as long- and short-term indicators, respectively, of future changes in global air temperature.
Jozef Klačka - One of the best experts on this subject based on the ideXlab platform.
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Dust in the Edgeworth-Kuiper belt zone
arXiv: Earth and Planetary Astrophysics, 2010Co-Authors: Jozef Klačka, L. Komar, P. PastorAbstract:Orbital evolution of spherical interplanetary dust particles in the Edgeworth-Kuiper belt zone is treated for semimajor axes 30-50 AU. Besides solar gravity, also solar electromagnetic and Corpuscular Radiation, and, fast interstellar gas flow are important forces influencing motion of the particles. The solar electromagnetic Radiation is represented by the Poynting-Robertson effect and the solar Corpuscular Radiation corresponds to the solar wind. Time-variability of the non-radial solar wind can significantly increase dust lifetime in the zone. The average time for the particle stay in the zone is more than 30-times greater than the conventional case of constant (time independent) radial solar wind offers, for the particles of tens micrometers in size. This holds for the most realistic material properties of the particles: $\bar{Q}'_{pr} =$ 1, where $\bar{Q}'_{pr}$ is the dimensionless efficiency factor for electromagnetic Radiation pressure. If $\bar{Q}'_{pr} =$ 1/2, then the average time of the particle stay in the zone is only 4-times the conventional value. The approach used in the paper illustrates the relevance of the solar wind action in comparison with the Poynting-Robertson effect. The results have an important consequence for our understanding of the structure of dust distribution in the Edgeworth-Kuiper belt zone, and, also, of dust belts in other stellar systems.
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Eccentricity evolution in mean motion resonance and non-radial solar wind
Astronomy & Astrophysics, 2009Co-Authors: P. Pastor, Jozef Klačka, J. Petržala, L. KomarAbstract:Eccentricity evolution of a dust particle in a mean motion orbital resonance with a planet in circular orbit is investigated. The action of solar electromagnetic and Corpuscular Radiation, including non-radial components of the solar wind velocity, is taken into account. Various types of eccentricity evolution depend on the angle between the radial direction and the direction of the solar wind velocity. The evolution changes at the analytically derived angles. Its application to exosolar systems is included.
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Orbital dispersion of comet Encke's meteoroids
Earth Moon and Planets, 1995Co-Authors: Jozef Klačka, E. M. PittichAbstract:The orbital evolution of model meteoroids ejected from the comet Encke has been investigated. The particles abandon the mother body with velocities 20 and 40 ms-1 perihelion within the interval of the past 10,000 years. Their 10,000 years old osculating orbits were numerically integrated forward, using a dynamical model of the solar system consisting of all planets. Forces from solar electromagnetic and Corpuscular Radiation effecting the particles are considered, too. Orbital dispersions of the model meteoroids are presented. The importance of nongravitational forces for a long-term orbital evolution of meteoroid streams is shown.
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Solar wind and spin of small interplanetary particles
Earth Moon and Planets, 1994Co-Authors: Jozef KlačkaAbstract:The action of the solar Corpuscular Radiation on the rotational properties of small interplanetary dust particles is investigated. It is shown that the solar wind increases the angular momentum (spin) of the particle. Analytic solutions are presented for dominant terms in which quantities of the orders ( v / u )^ n , n ≥ 1, are neglected ( v is the orbital velocity of dust particle around the Sun and u is the speed of the solar wind particles).
M.j. Smyth - One of the best experts on this subject based on the ideXlab platform.
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The Corpuscular Radiation of the sun
Vistas in Astronomy, 2002Co-Authors: M.j. SmythAbstract:Abstract F. J. M. Stratton in his Astronomical Physics (1925) summarized the available information about relationships between the Sun and the Earth thus: “Some connection, the exact nature of which is not known, also exists between disturbances on the Sun and magnetic storms and aurorae on the Earth. The chief point of interest lies in the recurrence of magnetic storms after an interval of 27·3 days—the synodic period of the sunspot zones: it is as though a storm arises when the Earth enters a beam of charged particles coming from a particular point on the Sun and is repeated 27·3 days later when the Earth occupies effectively the same position relative to the Sun”. Our knowledge of solar-terrestrial relationships has greatly expanded in the last thirty years, and various aspects are dealt with elsewhere in this volume. This article reviews the present evidence for Radiation of charged particles from the Sun as one source of such relationships.
Syroeshkin A.v. - One of the best experts on this subject based on the ideXlab platform.
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Abnormal changes in the density of thermal neutron flux in biocenoses near the earth surface
New York Consultants BureauSpringer Автономная некоммерческая организация Издательство Российской академии медицинских наук, 2020Co-Authors: Plotnikova N.v., Smirnov A.n., Kolesnikov M.v., Semenov D.s., Frolov V.a., Lapshin V.b., Syroeshkin A.v.Abstract:We revealed an increase in the density of thermal neutron flux in forest biocenoses, which was not associated with astrogeophysical events. The maximum spike of this parameter in the biocenosis reached 10,000 n/ (sec×m2). Diurnal pattern of the density of thermal neutron flux depended only on the type of biocenosis. The effects of biomodulation of Corpuscular Radiation for balneology are discussed. © Springer Science+Business Media, Inc. 2007
