George Gloeckler - Academia.edu (original) (raw)
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Saint-Petersburg Stieglitz State Academy of Art and Design
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MESSENGER's third flyby of Mercury en route to orbit insertion about the innermost planet too... more MESSENGER's third flyby of Mercury en route to orbit insertion about the innermost planet took place on 29 September 2009. The earlier 14 January and 6 October 2008 encounters revealed that Mercury's magnetic field is highly dipolar and stable over the 35 years since its discovery by Mariner 10; that a structured, temporally variable exosphere extends to great altitudes on
IEEE Transactions on Geoscience Electronics, 1978
The ISEE-1 and ISEE-C instruments have been designed to measure the elemental abundances, charge ... more The ISEE-1 and ISEE-C instruments have been designed to measure the elemental abundances, charge state composition, energy spectra, and angular distributions of energetic ions in the energy range 2 keV/charge to 80 MeV/nucleon and of electrons between 75 and 1300 keV. By covering the energy range between solar wind and low-energy cosmic rays the instrument will fill a gap in the knowledge especially of the nuclear and ionic composition of solar, interplanetary, and magnetospheric accelerated and trapped particles. The instrument consists of three different sensor systems: ULECA is an electrostatic deflection analyzer system with rectangular solid-state detectors as energy determining devices, its energy range is -3 to 560 keV/charge; the ULEWAT is a double dE/dX versus E thin-window flow-through proportional counter/solid-state detector telescope covering the energy range from 0.2 to 80 MeV/nucleon (Fe); the ULEZEQ sensor consists of a combination of an electrostatic deflection analyzer and a thin-window dE/dX versus E system with a thin-window proportional counter and a positionsensitive solid-state detector. The energy range is 0.4 MeV/nucleon to 6 MeV/nucleon. While the ULECA and the ULEWAT sensors are designed mainly for interplanetary and outer magnetospheric studies, the ULEZEQ sensor will also obtain composition data in the trapped radiation zone. 65 rates and pulse-height data can be obtained with sectoring in up to 16 sectors.
Geophysical Research Letters, 2009
The first Mercury flyby on 14 January 2008 by the MESSENGER spacecraft has re-intensified interes... more The first Mercury flyby on 14 January 2008 by the MESSENGER spacecraft has re-intensified interest in the solar wind interaction with Mercury's miniature (Earth-like) magnetosphere and extensive planetary exosphere. In order to provide a broad knowledge of the solar wind properties and also some estimate of the interplanetary magnetic field (IMF) near Mercury we have used an empirical modeling technique combined with a physics-based solar wind model. The empirical technique is based on the Wang-Sheeley-Arge (WSA) method that uses solar photospheric magnetic field observations (from Earth-based instruments) in order to estimate inner heliospheric boundary conditions at about 10 solar radii. This information is then used as inputs to the global magnetohydrodynamic (MHD) model, ENLIL, which calculates solar wind velocity, density, temperature, and magnetic field strength throughout the inner heliosphere, In this presentation we show WSA-ENLIL conditions computed for the period arou...
MESSENGER's third flyby of Mercury en route to orbit insertion about the innermost planet too... more MESSENGER's third flyby of Mercury en route to orbit insertion about the innermost planet took place on 29 September 2009. The earlier 14 January and 6 October 2008 encounters revealed that Mercury's magnetic field is highly dipolar and stable over the 35 years since its discovery by Mariner 10; that a structured, temporally variable exosphere extends to great altitudes on
IEEE Transactions on Geoscience Electronics, 1978
The ISEE-1 and ISEE-C instruments have been designed to measure the elemental abundances, charge ... more The ISEE-1 and ISEE-C instruments have been designed to measure the elemental abundances, charge state composition, energy spectra, and angular distributions of energetic ions in the energy range 2 keV/charge to 80 MeV/nucleon and of electrons between 75 and 1300 keV. By covering the energy range between solar wind and low-energy cosmic rays the instrument will fill a gap in the knowledge especially of the nuclear and ionic composition of solar, interplanetary, and magnetospheric accelerated and trapped particles. The instrument consists of three different sensor systems: ULECA is an electrostatic deflection analyzer system with rectangular solid-state detectors as energy determining devices, its energy range is -3 to 560 keV/charge; the ULEWAT is a double dE/dX versus E thin-window flow-through proportional counter/solid-state detector telescope covering the energy range from 0.2 to 80 MeV/nucleon (Fe); the ULEZEQ sensor consists of a combination of an electrostatic deflection analyzer and a thin-window dE/dX versus E system with a thin-window proportional counter and a positionsensitive solid-state detector. The energy range is 0.4 MeV/nucleon to 6 MeV/nucleon. While the ULECA and the ULEWAT sensors are designed mainly for interplanetary and outer magnetospheric studies, the ULEZEQ sensor will also obtain composition data in the trapped radiation zone. 65 rates and pulse-height data can be obtained with sectoring in up to 16 sectors.
Geophysical Research Letters, 2009
The first Mercury flyby on 14 January 2008 by the MESSENGER spacecraft has re-intensified interes... more The first Mercury flyby on 14 January 2008 by the MESSENGER spacecraft has re-intensified interest in the solar wind interaction with Mercury's miniature (Earth-like) magnetosphere and extensive planetary exosphere. In order to provide a broad knowledge of the solar wind properties and also some estimate of the interplanetary magnetic field (IMF) near Mercury we have used an empirical modeling technique combined with a physics-based solar wind model. The empirical technique is based on the Wang-Sheeley-Arge (WSA) method that uses solar photospheric magnetic field observations (from Earth-based instruments) in order to estimate inner heliospheric boundary conditions at about 10 solar radii. This information is then used as inputs to the global magnetohydrodynamic (MHD) model, ENLIL, which calculates solar wind velocity, density, temperature, and magnetic field strength throughout the inner heliosphere, In this presentation we show WSA-ENLIL conditions computed for the period arou...