The Experts below are selected from a list of 3198 Experts worldwide ranked by ideXlab platform
Christopher D. Elvidge - One of the best experts on this subject based on the ideXlab platform.
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Global Monitoring of the Night Sky Brightness by Satellites and the State of the Night Sky in Chile
Light Pollution: The Global View, 2003Co-Authors: P. Cinzano, Fabio Falchi, Christopher D. ElvidgeAbstract:We present the global monitoring of light pollution, night sky brightness and stellar visibility carried on by our group based on DMSP Satellite data and we describe the products obtained. We summarise the situation of the artificial night sky brightness in the World and we present a map of the night sky brightness in Chile taking into account the altitude of the observing site and simple projections to the year 2025 under two possible scenarios.
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Modelling Night Sky Brightness at Sites from DMSP Satellite Data
Light Pollution: The Global View, 2003Co-Authors: P. Cinzano, Christopher D. ElvidgeAbstract:We present preliminary results of the application of the night sky brightness modelling technique developed by Roy Garstang and extended by Cinzano, Falchi, Elvidge & Baugh and Cinzano, Falchi & Elvidge to high-resolution DMSP-OLS Satellite measurements of upward artificial light flux with the aim of predicting the brightness distribution of the night sky in the astronomical photometric bands at any given site. This method, based on global data and accounting for mountain screening, elevation and the Earth’s curvature, allows the evaluation of the sky glow over the entire sky at any site of the world for given atmospheric conditions.
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naked eye star visibility and limiting magnitude mapped from DMSP ols Satellite data
Monthly Notices of the Royal Astronomical Society, 2001Co-Authors: P. Cinzano, Fabio Falchi, Christopher D. ElvidgeAbstract:We extend the method introduced by Cinzano et al. to map the artificial sky brightness in large territories from DMSP Satellite data, in order to map the naked-eye star visibility and telescopic limiting magnitudes. For these purposes we take into account the altitude of each land area from GTOPO30 world elevation data, the natural sky brightness in the chosen sky direction, based on Garstang modelling, the eye capability with the naked eye or a telescope, based on the Schaefer and Garstang approach, and the stellar extinction in the visual photometric band. For near-zenith sky directions we also take into account screening by terrain elevation. Maps of naked-eye star visibility and telescopic limiting magnitudes are useful for quantifying the capability of the population to perceive our Universe, evaluating the future evolution, making cross-correlations with statistical parameters, and recognizing areas where astronomical observations or popularization can still acceptably be made. We present, as an application, maps of naked-eye star visibility and total sky brightness in the V band in Europe at the zenith with a resolution of approximately 1 km.
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The Artificial Sky Brightness in Europe Derived from DMSP Satellite Data
Symposium - International Astronomical Union, 2001Co-Authors: P. Cinzano, Fabio Falchi, Christopher D. Elvidge, Kimberly E. BaughAbstract:We present maps of the artificial sky brightness in Europe in V band with a resolution of ~1 km. The aim is to understand the state of night sky pollution in Europe, to quantify the present situation and to allow future monitoring of trends. For each terrestrial site the artificial sky brightness in a given direction on the sky is obtained by integrating the contributions from each surface area in the surroundings, using detailed models of the propagation in the atmosphere of the upward light flux emitted by the area. The top-of-atmosphere light flux is measured by the Operational Linescan System of the Defence Meteorological Satellite Program (DMSP) Satellites. The modelling technique, which was introduced and developed by Garstang, takes into account the extinction along light paths, double scattering of light from atmospheric molecules and aerosols, and Earth curvature. Use of this technique allows us to assess the aerosol content of the atmosphere.
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naked eye star visibility and limiting magnitude mapped from DMSP ols Satellite data
arXiv: Astrophysics, 2000Co-Authors: P. Cinzano, Fabio Falchi, Christopher D. ElvidgeAbstract:We extend the method introduced by Cinzano et al. (2000a) to map the artificial sky brightness in large territories from DMSP Satellite data, in order to map the naked eye star visibility and telescopic limiting magnitudes. For these purposes we take into account the altitude of each land area from GTOPO30 world elevation data, the natural sky brightness in the chosen sky direction, based on Garstang modelling, the eye capability with naked eye or a telescope, based on the Schaefer (1990) and Garstang (2000b) approach, and the stellar extinction in the visual photometric band. For near zenith sky directions we also take into account screening by terrain elevation. Maps of naked eye star visibility and telescopic limiting magnitudes are useful to quantify the capability of the population to perceive our Universe, to evaluate the future evolution, to make cross correlations with statistical parameters and to recognize areas where astronomical observations or popularisation can still acceptably be made. We present, as an application, maps of naked eye star visibility and total sky brightness in V band in Europe at the zenith with a resolution of approximately 1 km.
P. Cinzano - One of the best experts on this subject based on the ideXlab platform.
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Global Monitoring of the Night Sky Brightness by Satellites and the State of the Night Sky in Chile
Light Pollution: The Global View, 2003Co-Authors: P. Cinzano, Fabio Falchi, Christopher D. ElvidgeAbstract:We present the global monitoring of light pollution, night sky brightness and stellar visibility carried on by our group based on DMSP Satellite data and we describe the products obtained. We summarise the situation of the artificial night sky brightness in the World and we present a map of the night sky brightness in Chile taking into account the altitude of the observing site and simple projections to the year 2025 under two possible scenarios.
-
Modelling Night Sky Brightness at Sites from DMSP Satellite Data
Light Pollution: The Global View, 2003Co-Authors: P. Cinzano, Christopher D. ElvidgeAbstract:We present preliminary results of the application of the night sky brightness modelling technique developed by Roy Garstang and extended by Cinzano, Falchi, Elvidge & Baugh and Cinzano, Falchi & Elvidge to high-resolution DMSP-OLS Satellite measurements of upward artificial light flux with the aim of predicting the brightness distribution of the night sky in the astronomical photometric bands at any given site. This method, based on global data and accounting for mountain screening, elevation and the Earth’s curvature, allows the evaluation of the sky glow over the entire sky at any site of the world for given atmospheric conditions.
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naked eye star visibility and limiting magnitude mapped from DMSP ols Satellite data
Monthly Notices of the Royal Astronomical Society, 2001Co-Authors: P. Cinzano, Fabio Falchi, Christopher D. ElvidgeAbstract:We extend the method introduced by Cinzano et al. to map the artificial sky brightness in large territories from DMSP Satellite data, in order to map the naked-eye star visibility and telescopic limiting magnitudes. For these purposes we take into account the altitude of each land area from GTOPO30 world elevation data, the natural sky brightness in the chosen sky direction, based on Garstang modelling, the eye capability with the naked eye or a telescope, based on the Schaefer and Garstang approach, and the stellar extinction in the visual photometric band. For near-zenith sky directions we also take into account screening by terrain elevation. Maps of naked-eye star visibility and telescopic limiting magnitudes are useful for quantifying the capability of the population to perceive our Universe, evaluating the future evolution, making cross-correlations with statistical parameters, and recognizing areas where astronomical observations or popularization can still acceptably be made. We present, as an application, maps of naked-eye star visibility and total sky brightness in the V band in Europe at the zenith with a resolution of approximately 1 km.
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The Artificial Sky Brightness in Europe Derived from DMSP Satellite Data
Symposium - International Astronomical Union, 2001Co-Authors: P. Cinzano, Fabio Falchi, Christopher D. Elvidge, Kimberly E. BaughAbstract:We present maps of the artificial sky brightness in Europe in V band with a resolution of ~1 km. The aim is to understand the state of night sky pollution in Europe, to quantify the present situation and to allow future monitoring of trends. For each terrestrial site the artificial sky brightness in a given direction on the sky is obtained by integrating the contributions from each surface area in the surroundings, using detailed models of the propagation in the atmosphere of the upward light flux emitted by the area. The top-of-atmosphere light flux is measured by the Operational Linescan System of the Defence Meteorological Satellite Program (DMSP) Satellites. The modelling technique, which was introduced and developed by Garstang, takes into account the extinction along light paths, double scattering of light from atmospheric molecules and aerosols, and Earth curvature. Use of this technique allows us to assess the aerosol content of the atmosphere.
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naked eye star visibility and limiting magnitude mapped from DMSP ols Satellite data
arXiv: Astrophysics, 2000Co-Authors: P. Cinzano, Fabio Falchi, Christopher D. ElvidgeAbstract:We extend the method introduced by Cinzano et al. (2000a) to map the artificial sky brightness in large territories from DMSP Satellite data, in order to map the naked eye star visibility and telescopic limiting magnitudes. For these purposes we take into account the altitude of each land area from GTOPO30 world elevation data, the natural sky brightness in the chosen sky direction, based on Garstang modelling, the eye capability with naked eye or a telescope, based on the Schaefer (1990) and Garstang (2000b) approach, and the stellar extinction in the visual photometric band. For near zenith sky directions we also take into account screening by terrain elevation. Maps of naked eye star visibility and telescopic limiting magnitudes are useful to quantify the capability of the population to perceive our Universe, to evaluate the future evolution, to make cross correlations with statistical parameters and to recognize areas where astronomical observations or popularisation can still acceptably be made. We present, as an application, maps of naked eye star visibility and total sky brightness in V band in Europe at the zenith with a resolution of approximately 1 km.
Fabio Falchi - One of the best experts on this subject based on the ideXlab platform.
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Global Monitoring of the Night Sky Brightness by Satellites and the State of the Night Sky in Chile
Light Pollution: The Global View, 2003Co-Authors: P. Cinzano, Fabio Falchi, Christopher D. ElvidgeAbstract:We present the global monitoring of light pollution, night sky brightness and stellar visibility carried on by our group based on DMSP Satellite data and we describe the products obtained. We summarise the situation of the artificial night sky brightness in the World and we present a map of the night sky brightness in Chile taking into account the altitude of the observing site and simple projections to the year 2025 under two possible scenarios.
-
naked eye star visibility and limiting magnitude mapped from DMSP ols Satellite data
Monthly Notices of the Royal Astronomical Society, 2001Co-Authors: P. Cinzano, Fabio Falchi, Christopher D. ElvidgeAbstract:We extend the method introduced by Cinzano et al. to map the artificial sky brightness in large territories from DMSP Satellite data, in order to map the naked-eye star visibility and telescopic limiting magnitudes. For these purposes we take into account the altitude of each land area from GTOPO30 world elevation data, the natural sky brightness in the chosen sky direction, based on Garstang modelling, the eye capability with the naked eye or a telescope, based on the Schaefer and Garstang approach, and the stellar extinction in the visual photometric band. For near-zenith sky directions we also take into account screening by terrain elevation. Maps of naked-eye star visibility and telescopic limiting magnitudes are useful for quantifying the capability of the population to perceive our Universe, evaluating the future evolution, making cross-correlations with statistical parameters, and recognizing areas where astronomical observations or popularization can still acceptably be made. We present, as an application, maps of naked-eye star visibility and total sky brightness in the V band in Europe at the zenith with a resolution of approximately 1 km.
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The Artificial Sky Brightness in Europe Derived from DMSP Satellite Data
Symposium - International Astronomical Union, 2001Co-Authors: P. Cinzano, Fabio Falchi, Christopher D. Elvidge, Kimberly E. BaughAbstract:We present maps of the artificial sky brightness in Europe in V band with a resolution of ~1 km. The aim is to understand the state of night sky pollution in Europe, to quantify the present situation and to allow future monitoring of trends. For each terrestrial site the artificial sky brightness in a given direction on the sky is obtained by integrating the contributions from each surface area in the surroundings, using detailed models of the propagation in the atmosphere of the upward light flux emitted by the area. The top-of-atmosphere light flux is measured by the Operational Linescan System of the Defence Meteorological Satellite Program (DMSP) Satellites. The modelling technique, which was introduced and developed by Garstang, takes into account the extinction along light paths, double scattering of light from atmospheric molecules and aerosols, and Earth curvature. Use of this technique allows us to assess the aerosol content of the atmosphere.
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naked eye star visibility and limiting magnitude mapped from DMSP ols Satellite data
arXiv: Astrophysics, 2000Co-Authors: P. Cinzano, Fabio Falchi, Christopher D. ElvidgeAbstract:We extend the method introduced by Cinzano et al. (2000a) to map the artificial sky brightness in large territories from DMSP Satellite data, in order to map the naked eye star visibility and telescopic limiting magnitudes. For these purposes we take into account the altitude of each land area from GTOPO30 world elevation data, the natural sky brightness in the chosen sky direction, based on Garstang modelling, the eye capability with naked eye or a telescope, based on the Schaefer (1990) and Garstang (2000b) approach, and the stellar extinction in the visual photometric band. For near zenith sky directions we also take into account screening by terrain elevation. Maps of naked eye star visibility and telescopic limiting magnitudes are useful to quantify the capability of the population to perceive our Universe, to evaluate the future evolution, to make cross correlations with statistical parameters and to recognize areas where astronomical observations or popularisation can still acceptably be made. We present, as an application, maps of naked eye star visibility and total sky brightness in V band in Europe at the zenith with a resolution of approximately 1 km.
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the artificial night sky brightness mapped from DMSP Satellite operational linescan system measurements
Monthly Notices of the Royal Astronomical Society, 2000Co-Authors: P. Cinzano, Fabio Falchi, Christopher D. Elvidge, Kimberly E. BaughAbstract:ABSTRA C T We present a method to map the artificial sky brightness across large territories in astronomical photometric bands with a resolution of approximately 1 km. This is of use in quantifying the situation regarding night sky pollution, recognizing potential astronomical sites and allowing future monitoring of trends. The artificial sky brightness present in the chosen direction at a given position on the surface of the Earth is obtained by the integration of the contributions produced by every surface area in the surroundings. Each contribution is computed via detailed models for the propagation in the atmosphere of the upward light flux emitted by the area. The light flux is measured with top-of-atmosphere radiometric observations made by the Defense Meteorological Satellite Program (DMSP) Operational Linescan System. We have applied the described method to Europe, obtaining maps of artificial sky brightness in the V and B bands.
R A Heelis - One of the best experts on this subject based on the ideXlab platform.
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demeter and DMSP Satellite observations of the disturbed h o ratio caused by earth s seismic activity in the sumatra area during december 2004
Advances in Space Research, 2010Co-Authors: L.g. Bankov, M. Parrot, R A Heelis, Jean-jacques Berthelier, Pencho Marinov, A.k. VassilevaAbstract:Abstract In the present paper, plasma probe data taken from DEMETER and DMSP-F15 Satellites were used to study the ion density and temperature disturbances in the morning topside ionosphere, caused by seismic activity at low latitudes. French DEMETER (Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions) micro-Satellite mission had been especially designed to provide global scale observations in the topside ionosphere over seismically active regions. Onboard the DEMETER Satellite, the thermal plasma instrument called “Instrument Analyser de Plasma” (IAP) provides ion mass and densities, ion temperature, three component ion drift and ion density irregularities measurements. As a part of “Defense Meteorological Satellite Program”, DMSP-F15 Satellite is on orbit operation since 1999. It provides ionospheric plasma diagnostics by means of the “Special Sensor-Ion, Electron and Scintillations” (SSIES-2) instrument. We examined few examples of possible seismic effects in the equatorial ionosphere, probably associated with seismic activity during December month in the area of Sumatra Island, including main shock of giant Sumatra event. It is found that the localized topside ionospheric disturbances appear close to the epicenters of certain earthquakes in the Sumatra region. In two cases, ion H + /O + ratio rises more than one hour before the main shock, due to the O + density decrease at the winter side of the geomagnetic equator, with longitudinally closest location to the epicenter of the earthquakes. These anomalous depletions in O + density do exist in all cases of SSIES-2 data. Particularly for Sumatra main event, more than one hour after the main shock, we observe large-scale depletion in O + density northward of the geomagnetic equator at winter side hemisphere. Associated with O + depletion, ion temperature latitudinal profile around the geomagnetic equator shows enhanced asymmetry with minimum at the summer side and maximum in positive Ti deviation from mean value at the winter side. This disturbance lasted for more than three hours, later in time observed at the same place by IAP/DEMETER.
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DEMETER and DMSP Satellite observations of the disturbed H+/O+ ratio caused by Earth's seismic activity in the Sumatra area during December 2004
Advances in Space Research, 2010Co-Authors: L.g. Bankov, R A Heelis, Michel Parrot, Jean-jacques Berthelier, P.g. Marinov, A.k. VassilevaAbstract:In the present paper, plasma probe data taken from DEMETER and DMSP-F15 Satellites were used to study the ion density and temperature disturbances in the morning topside ionosphere, caused by seismic activity at low latitudes. French DEMETER (Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions) micro-Satellite mission had been especially designed to provide global scale observations in the topside ionosphere over seismically active regions. Onboard the DEMETER Satellite, the thermal plasma instrument called "Instrument Analyser de Plasma" (IAP) provides ion mass and densities, ion temperature, three component ion drift and ion density irregularities measurements. As a part of "Defense Meteorological Satellite Program", DMSP-F15 Satellite is on orbit operation since 1999. It provides ionospheric plasma diagnostics by means of the "Special Sensor-Ion, Electron and Scintillations" (SSIES-2) instrument. We examined few examples of possible seismic effects in the equatorial ionosphere, probably associated with seismic activity during December month in the area of Sumatra Island, including main shock of giant Sumatra event
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ion and neutral motions observed in the winter polar upper atmosphere
Journal of Geophysical Research, 2002Co-Authors: R A Heelis, D McewenAbstract:[1] Continuous samples of the ion drift are made near 800-km altitude from the DMSP Satellite and compared with remote measurements of the F region neutral winds made from the ground at Eureka in the northern polar cap. These measurements are compared with each other and with variations in the interplanetary magnetic field and solar wind. Over a 6-day period, linear relationships between the north-south component of the IMF and the noon-midnight components of the ion and neutral drifts are used to determine the response times of the gas motions to changes in the solar wind driver. When the IMF is southward or weakly northward, the ion and neutral gas response begins almost immediately following a change in the solar wind driver. The time constant for the ion response is about 20 min, while for an F peak density of about 5 × 105 cm−3 the neutral time constant is 75 min. While significant variability exists, the 55-min time difference between the response times is consistent with the neutral-ion collision time prevailing in the F region at the time and location of the measurements. In the quasi-equilibrium state, antisunward ion drifts in excess of 150 m s−1 drive the neutral gas antisunward with speeds about 60% of the ion drift.
Kimberly E. Baugh - One of the best experts on this subject based on the ideXlab platform.
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The Artificial Sky Brightness in Europe Derived from DMSP Satellite Data
Symposium - International Astronomical Union, 2001Co-Authors: P. Cinzano, Fabio Falchi, Christopher D. Elvidge, Kimberly E. BaughAbstract:We present maps of the artificial sky brightness in Europe in V band with a resolution of ~1 km. The aim is to understand the state of night sky pollution in Europe, to quantify the present situation and to allow future monitoring of trends. For each terrestrial site the artificial sky brightness in a given direction on the sky is obtained by integrating the contributions from each surface area in the surroundings, using detailed models of the propagation in the atmosphere of the upward light flux emitted by the area. The top-of-atmosphere light flux is measured by the Operational Linescan System of the Defence Meteorological Satellite Program (DMSP) Satellites. The modelling technique, which was introduced and developed by Garstang, takes into account the extinction along light paths, double scattering of light from atmospheric molecules and aerosols, and Earth curvature. Use of this technique allows us to assess the aerosol content of the atmosphere.
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the artificial night sky brightness mapped from DMSP Satellite operational linescan system measurements
Monthly Notices of the Royal Astronomical Society, 2000Co-Authors: P. Cinzano, Fabio Falchi, Christopher D. Elvidge, Kimberly E. BaughAbstract:ABSTRA C T We present a method to map the artificial sky brightness across large territories in astronomical photometric bands with a resolution of approximately 1 km. This is of use in quantifying the situation regarding night sky pollution, recognizing potential astronomical sites and allowing future monitoring of trends. The artificial sky brightness present in the chosen direction at a given position on the surface of the Earth is obtained by the integration of the contributions produced by every surface area in the surroundings. Each contribution is computed via detailed models for the propagation in the atmosphere of the upward light flux emitted by the area. The light flux is measured with top-of-atmosphere radiometric observations made by the Defense Meteorological Satellite Program (DMSP) Operational Linescan System. We have applied the described method to Europe, obtaining maps of artificial sky brightness in the V and B bands.
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The artificial sky brightness in Europe derived from DMSP Satellite data
arXiv: Astrophysics, 1999Co-Authors: P. Cinzano, Fabio Falchi, Christopher D. Elvidge, Kimberly E. BaughAbstract:We present the map of the artificial sky brightness in Europe in V band with a resolution of approximately 1 km. The aim is to understand the state of night sky pollution in Europe, to quantify the present situation and to allow future monitoring of trends. The artificial sky brightness in each site at a given position on the sky is obtained by integration of the contributions produced by every surface area in the surroundings of the site. Each contribution is computed taking into account based on detailed models the propagation in the atmosphere of the upward light flux emitted by the area and measured by the Operational Linescan System of DMSP Satellites. The modelling technique, introduced and developed by Garstang and also applied by Cinzano, takes into account the extinction along light paths, a double scattering of light from atmospheric molecules and aerosols, Earth curvature and allows to associate the predictions to the aerosol content of the atmosphere.
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Mapping the artificial sky brightness in Europe from DMSP Satellite measurements: the situation of the night sky in Italy in the last quarter of century
arXiv: Astrophysics, 1999Co-Authors: P. Cinzano, Fabio Falchi, Christopher D. Elvidge, Kimberly E. BaughAbstract:We present a project to map the artificial sky brightness in Europe in the main astronomical photometrical bands with a resolution better than 3 km. The aim is to understand the state of night sky pollution in Europe, to quantify the present situation and to allow future monitoring of trends. The artificial sky brightness in each site at a given position on the sky is obtained by the integration of the contributions produced by every surface area in the surroundings of the site. Each contribution is computed taking in account the propagation in the atmosphere of the upward light flux emitted by the area and measured from DMSP Satellites. The project is a long term study in which we plan to take in account successively of many different details in order to improve the maps. We present, as a preliminary result, a map of the V-band artificial sky brightness in Italy in 1998 and we compare it with the map obtained 27 years earlier by Bertiau, Treanor and De Graeve. Predictions for the artificial sky brightness within the next 27 years are also shown.