The Experts below are selected from a list of 216 Experts worldwide ranked by ideXlab platform
J S Pickett - One of the best experts on this subject based on the ideXlab platform.
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spatial dependence of banded chorus intensity near the Magnetic Equator
Geophysical Research Letters, 2012Co-Authors: N. Haque, U S Inan, T F Bell, J S PickettAbstract:[1] Data from 12 different Cluster orbits containing banded chorus emissions, with observations from 22 different events spread across the four Cluster spacecraft, are used to show the spatial dependence of banded chorus intensity near the Magnetic Equator under conditions of moderate Magnetic disturbance (Kp≤ 5). The intensities for upper band (UB) and lower band (LB) chorus were manually determined from frequency-time spectrograms generated from WBD data. Out of the 22 events, 5 of the spacecraft observations showed a complete absence of chorus emissions within 0.5° of the Magnetic Equator. The intensity,I, of the chorus emissions generally increased exponentially with distance, z, away from the Magnetic Equator according to the relation I = Ioeaz, where α is the spatial growth factor. The exponential distribution of α provides a new boundary condition for consideration in current and future chorus generation models.
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rapidly moving sources of upper band elf vlf chorus near the Magnetic Equator
Journal of Geophysical Research, 2006Co-Authors: M Platino, U S Inan, T F Bell, J S Pickett, P CanuAbstract:[1] Multiple simultaneous wideband (Gurnett et al., 2001) measurements on the Cluster spacecraft of upper band chorus emissions near the Magnetic Equator (at Magnetic latitudes between −20° and 10° and L shells ranging between L = 4 and L = 5) are used to deduce the properties of the compact source regions of ELF/VLF chorus emissions. The frequency differences exhibited by the same chorus emissions observed on different spacecraft are interpreted (Inan et al., 2004) in terms of a differential Doppler shift, using a simple model involving rapidly moving sources traveling at speeds comparable to the parallel resonant velocity of counter-streaming gyroresonant electrons. Cluster observations are used to determine the location and extent along the Earth's Magnetic field lines of the source of chorus. Frequency and time differences between spacecraft are interpreted as a direct consequence of the rapid motion of highly localized source regions of chorus. In this paper, we examine the previously presented model of rapid motion of sources of chorus, extending the calculations to a three-dimensional space, using measurements of the four Cluster spacecraft. These calculations of source location and velocity as a function of frequency indicate that chorus sources move a distance of ∼6000 km along the field lines. The emitted chorus waves at the source are assumed to have a wide range of wave normal angles, but the rays reaching the spacecraft seem to be the ones with lower angles (with some exceptions). The ranges of velocity obtained vary with frequency around values ranging from ∼0.01c to ∼0.04c.
U S Inan - One of the best experts on this subject based on the ideXlab platform.
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spatial dependence of banded chorus intensity near the Magnetic Equator
Geophysical Research Letters, 2012Co-Authors: N. Haque, U S Inan, T F Bell, J S PickettAbstract:[1] Data from 12 different Cluster orbits containing banded chorus emissions, with observations from 22 different events spread across the four Cluster spacecraft, are used to show the spatial dependence of banded chorus intensity near the Magnetic Equator under conditions of moderate Magnetic disturbance (Kp≤ 5). The intensities for upper band (UB) and lower band (LB) chorus were manually determined from frequency-time spectrograms generated from WBD data. Out of the 22 events, 5 of the spacecraft observations showed a complete absence of chorus emissions within 0.5° of the Magnetic Equator. The intensity,I, of the chorus emissions generally increased exponentially with distance, z, away from the Magnetic Equator according to the relation I = Ioeaz, where α is the spatial growth factor. The exponential distribution of α provides a new boundary condition for consideration in current and future chorus generation models.
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rapidly moving sources of upper band elf vlf chorus near the Magnetic Equator
Journal of Geophysical Research, 2006Co-Authors: M Platino, U S Inan, T F Bell, J S Pickett, P CanuAbstract:[1] Multiple simultaneous wideband (Gurnett et al., 2001) measurements on the Cluster spacecraft of upper band chorus emissions near the Magnetic Equator (at Magnetic latitudes between −20° and 10° and L shells ranging between L = 4 and L = 5) are used to deduce the properties of the compact source regions of ELF/VLF chorus emissions. The frequency differences exhibited by the same chorus emissions observed on different spacecraft are interpreted (Inan et al., 2004) in terms of a differential Doppler shift, using a simple model involving rapidly moving sources traveling at speeds comparable to the parallel resonant velocity of counter-streaming gyroresonant electrons. Cluster observations are used to determine the location and extent along the Earth's Magnetic field lines of the source of chorus. Frequency and time differences between spacecraft are interpreted as a direct consequence of the rapid motion of highly localized source regions of chorus. In this paper, we examine the previously presented model of rapid motion of sources of chorus, extending the calculations to a three-dimensional space, using measurements of the four Cluster spacecraft. These calculations of source location and velocity as a function of frequency indicate that chorus sources move a distance of ∼6000 km along the field lines. The emitted chorus waves at the source are assumed to have a wide range of wave normal angles, but the rays reaching the spacecraft seem to be the ones with lower angles (with some exceptions). The ranges of velocity obtained vary with frequency around values ranging from ∼0.01c to ∼0.04c.
P Canu - One of the best experts on this subject based on the ideXlab platform.
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rapidly moving sources of upper band elf vlf chorus near the Magnetic Equator
Journal of Geophysical Research, 2006Co-Authors: M Platino, U S Inan, T F Bell, J S Pickett, P CanuAbstract:[1] Multiple simultaneous wideband (Gurnett et al., 2001) measurements on the Cluster spacecraft of upper band chorus emissions near the Magnetic Equator (at Magnetic latitudes between −20° and 10° and L shells ranging between L = 4 and L = 5) are used to deduce the properties of the compact source regions of ELF/VLF chorus emissions. The frequency differences exhibited by the same chorus emissions observed on different spacecraft are interpreted (Inan et al., 2004) in terms of a differential Doppler shift, using a simple model involving rapidly moving sources traveling at speeds comparable to the parallel resonant velocity of counter-streaming gyroresonant electrons. Cluster observations are used to determine the location and extent along the Earth's Magnetic field lines of the source of chorus. Frequency and time differences between spacecraft are interpreted as a direct consequence of the rapid motion of highly localized source regions of chorus. In this paper, we examine the previously presented model of rapid motion of sources of chorus, extending the calculations to a three-dimensional space, using measurements of the four Cluster spacecraft. These calculations of source location and velocity as a function of frequency indicate that chorus sources move a distance of ∼6000 km along the field lines. The emitted chorus waves at the source are assumed to have a wide range of wave normal angles, but the rays reaching the spacecraft seem to be the ones with lower angles (with some exceptions). The ranges of velocity obtained vary with frequency around values ranging from ∼0.01c to ∼0.04c.
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Rapidly moving sources of upper band ELF/VLF chorus near the Magnetic Equator
Journal of Geophysical Research, 2006Co-Authors: M Platino, T F Bell, Umran S. Inan, Jolene S. Pickett, P CanuAbstract:[1] Multiple simultaneous wideband (Gurnett et al., 2001) measurements on the Cluster spacecraft of upper band chorus emissions near the Magnetic Equator (at Magnetic latitudes between −20° and 10° and L shells ranging between L = 4 and L = 5) are used to deduce the properties of the compact source regions of ELF/VLF chorus emissions. The frequency differences exhibited by the same chorus emissions observed on different spacecraft are interpreted (Inan et al., 2004) in terms of a differential Doppler shift, using a simple model involving rapidly moving sources traveling at speeds comparable to the parallel resonant velocity of counter-streaming gyroresonant electrons. Cluster observations are used to determine the location and extent along the Earth's Magnetic field lines of the source of chorus. Frequency and time differences between spacecraft are interpreted as a direct consequence of the rapid motion of highly localized source regions of chorus. In this paper, we examine the previously presented model of rapid motion of sources of chorus, extending the calculations to a three-dimensional space, using measurements of the four Cluster spacecraft. These calculations of source location and velocity as a function of frequency indicate that chorus sources move a distance of ∼6000 km along the field lines. The emitted chorus waves at the source are assumed to have a wide range of wave normal angles, but the rays reaching the spacecraft seem to be the ones with lower angles (with some exceptions). The ranges of velocity obtained vary with frequency around values ranging from ∼0.01c to ∼0.04c.
T F Bell - One of the best experts on this subject based on the ideXlab platform.
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spatial dependence of banded chorus intensity near the Magnetic Equator
Geophysical Research Letters, 2012Co-Authors: N. Haque, U S Inan, T F Bell, J S PickettAbstract:[1] Data from 12 different Cluster orbits containing banded chorus emissions, with observations from 22 different events spread across the four Cluster spacecraft, are used to show the spatial dependence of banded chorus intensity near the Magnetic Equator under conditions of moderate Magnetic disturbance (Kp≤ 5). The intensities for upper band (UB) and lower band (LB) chorus were manually determined from frequency-time spectrograms generated from WBD data. Out of the 22 events, 5 of the spacecraft observations showed a complete absence of chorus emissions within 0.5° of the Magnetic Equator. The intensity,I, of the chorus emissions generally increased exponentially with distance, z, away from the Magnetic Equator according to the relation I = Ioeaz, where α is the spatial growth factor. The exponential distribution of α provides a new boundary condition for consideration in current and future chorus generation models.
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rapidly moving sources of upper band elf vlf chorus near the Magnetic Equator
Journal of Geophysical Research, 2006Co-Authors: M Platino, U S Inan, T F Bell, J S Pickett, P CanuAbstract:[1] Multiple simultaneous wideband (Gurnett et al., 2001) measurements on the Cluster spacecraft of upper band chorus emissions near the Magnetic Equator (at Magnetic latitudes between −20° and 10° and L shells ranging between L = 4 and L = 5) are used to deduce the properties of the compact source regions of ELF/VLF chorus emissions. The frequency differences exhibited by the same chorus emissions observed on different spacecraft are interpreted (Inan et al., 2004) in terms of a differential Doppler shift, using a simple model involving rapidly moving sources traveling at speeds comparable to the parallel resonant velocity of counter-streaming gyroresonant electrons. Cluster observations are used to determine the location and extent along the Earth's Magnetic field lines of the source of chorus. Frequency and time differences between spacecraft are interpreted as a direct consequence of the rapid motion of highly localized source regions of chorus. In this paper, we examine the previously presented model of rapid motion of sources of chorus, extending the calculations to a three-dimensional space, using measurements of the four Cluster spacecraft. These calculations of source location and velocity as a function of frequency indicate that chorus sources move a distance of ∼6000 km along the field lines. The emitted chorus waves at the source are assumed to have a wide range of wave normal angles, but the rays reaching the spacecraft seem to be the ones with lower angles (with some exceptions). The ranges of velocity obtained vary with frequency around values ranging from ∼0.01c to ∼0.04c.
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Rapidly moving sources of upper band ELF/VLF chorus near the Magnetic Equator
Journal of Geophysical Research, 2006Co-Authors: M Platino, T F Bell, Umran S. Inan, Jolene S. Pickett, P CanuAbstract:[1] Multiple simultaneous wideband (Gurnett et al., 2001) measurements on the Cluster spacecraft of upper band chorus emissions near the Magnetic Equator (at Magnetic latitudes between −20° and 10° and L shells ranging between L = 4 and L = 5) are used to deduce the properties of the compact source regions of ELF/VLF chorus emissions. The frequency differences exhibited by the same chorus emissions observed on different spacecraft are interpreted (Inan et al., 2004) in terms of a differential Doppler shift, using a simple model involving rapidly moving sources traveling at speeds comparable to the parallel resonant velocity of counter-streaming gyroresonant electrons. Cluster observations are used to determine the location and extent along the Earth's Magnetic field lines of the source of chorus. Frequency and time differences between spacecraft are interpreted as a direct consequence of the rapid motion of highly localized source regions of chorus. In this paper, we examine the previously presented model of rapid motion of sources of chorus, extending the calculations to a three-dimensional space, using measurements of the four Cluster spacecraft. These calculations of source location and velocity as a function of frequency indicate that chorus sources move a distance of ∼6000 km along the field lines. The emitted chorus waves at the source are assumed to have a wide range of wave normal angles, but the rays reaching the spacecraft seem to be the ones with lower angles (with some exceptions). The ranges of velocity obtained vary with frequency around values ranging from ∼0.01c to ∼0.04c.
M Platino - One of the best experts on this subject based on the ideXlab platform.
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rapidly moving sources of upper band elf vlf chorus near the Magnetic Equator
Journal of Geophysical Research, 2006Co-Authors: M Platino, U S Inan, T F Bell, J S Pickett, P CanuAbstract:[1] Multiple simultaneous wideband (Gurnett et al., 2001) measurements on the Cluster spacecraft of upper band chorus emissions near the Magnetic Equator (at Magnetic latitudes between −20° and 10° and L shells ranging between L = 4 and L = 5) are used to deduce the properties of the compact source regions of ELF/VLF chorus emissions. The frequency differences exhibited by the same chorus emissions observed on different spacecraft are interpreted (Inan et al., 2004) in terms of a differential Doppler shift, using a simple model involving rapidly moving sources traveling at speeds comparable to the parallel resonant velocity of counter-streaming gyroresonant electrons. Cluster observations are used to determine the location and extent along the Earth's Magnetic field lines of the source of chorus. Frequency and time differences between spacecraft are interpreted as a direct consequence of the rapid motion of highly localized source regions of chorus. In this paper, we examine the previously presented model of rapid motion of sources of chorus, extending the calculations to a three-dimensional space, using measurements of the four Cluster spacecraft. These calculations of source location and velocity as a function of frequency indicate that chorus sources move a distance of ∼6000 km along the field lines. The emitted chorus waves at the source are assumed to have a wide range of wave normal angles, but the rays reaching the spacecraft seem to be the ones with lower angles (with some exceptions). The ranges of velocity obtained vary with frequency around values ranging from ∼0.01c to ∼0.04c.
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Rapidly moving sources of upper band ELF/VLF chorus near the Magnetic Equator
Journal of Geophysical Research, 2006Co-Authors: M Platino, T F Bell, Umran S. Inan, Jolene S. Pickett, P CanuAbstract:[1] Multiple simultaneous wideband (Gurnett et al., 2001) measurements on the Cluster spacecraft of upper band chorus emissions near the Magnetic Equator (at Magnetic latitudes between −20° and 10° and L shells ranging between L = 4 and L = 5) are used to deduce the properties of the compact source regions of ELF/VLF chorus emissions. The frequency differences exhibited by the same chorus emissions observed on different spacecraft are interpreted (Inan et al., 2004) in terms of a differential Doppler shift, using a simple model involving rapidly moving sources traveling at speeds comparable to the parallel resonant velocity of counter-streaming gyroresonant electrons. Cluster observations are used to determine the location and extent along the Earth's Magnetic field lines of the source of chorus. Frequency and time differences between spacecraft are interpreted as a direct consequence of the rapid motion of highly localized source regions of chorus. In this paper, we examine the previously presented model of rapid motion of sources of chorus, extending the calculations to a three-dimensional space, using measurements of the four Cluster spacecraft. These calculations of source location and velocity as a function of frequency indicate that chorus sources move a distance of ∼6000 km along the field lines. The emitted chorus waves at the source are assumed to have a wide range of wave normal angles, but the rays reaching the spacecraft seem to be the ones with lower angles (with some exceptions). The ranges of velocity obtained vary with frequency around values ranging from ∼0.01c to ∼0.04c.
