Robert Gamache | University of Massachusetts, Lowell (original) (raw)
Papers by Robert Gamache
Molecular Physics, Jul 30, 2010
HAL (Le Centre pour la Communication Scientifique Directe), Jun 15, 2008
Communication P6
Journal of Quantitative Spectroscopy and Radiative Transfer, 2021
Journal of Quantitative Spectroscopy and Radiative Transfer, 2015
Journal of Molecular Spectroscopy, 2016
Radio Science, 1989
The ionosphere is known to be a dispersive medium. Additionally, for a fixed ground distance inan... more The ionosphere is known to be a dispersive medium. Additionally, for a fixed ground distance inan oblique propagation geometry, the ray of each Fourier component of a pulse follows its own path in a phenomenon known as frequency splitting. As a consequence of these two factors distortion results. Under the approximation of a quadratic phase channel, this distortion is most conveniently characterized by a quantity, known as the dispersive bandwidth. Formulas for the dispersive bandwidth have been derived both for the linear layer and the parabolic layer and are given without showing derivations. A technique has been developed to analyze the vertical ionogram for dispersive bandwidth. This technique has been applied to several days of digital ionosonde data. The resulting values of dispersive bandwidth are reasonable and plotted over a diurnal cycle. Such a technique should be further developed as a step toward eventual application to ionospheric informatics.
Proceedings of the 70th International Symposium on Molecular Spectroscopy, 2015
Journal of Quantitative Spectroscopy and Radiative Transfer, 2015
Structure and dynamics of the ionosphere are explored under this contract by digital high-frequen... more Structure and dynamics of the ionosphere are explored under this contract by digital high-frequency sounding techniques. The research emphasizes the investigation of the auroral and subauroral ionosphere, but also includes studies on the polar-cap and mid-latitude ionosphere.
Journal of Quantitative Spectroscopy and Radiative Transfer, 2005
Journal of Geophysical Research, 1994
Molecular Physics, Jul 30, 2010
HAL (Le Centre pour la Communication Scientifique Directe), Jun 15, 2008
Communication P6
Journal of Quantitative Spectroscopy and Radiative Transfer, 2021
Journal of Quantitative Spectroscopy and Radiative Transfer, 2015
Journal of Molecular Spectroscopy, 2016
Radio Science, 1989
The ionosphere is known to be a dispersive medium. Additionally, for a fixed ground distance inan... more The ionosphere is known to be a dispersive medium. Additionally, for a fixed ground distance inan oblique propagation geometry, the ray of each Fourier component of a pulse follows its own path in a phenomenon known as frequency splitting. As a consequence of these two factors distortion results. Under the approximation of a quadratic phase channel, this distortion is most conveniently characterized by a quantity, known as the dispersive bandwidth. Formulas for the dispersive bandwidth have been derived both for the linear layer and the parabolic layer and are given without showing derivations. A technique has been developed to analyze the vertical ionogram for dispersive bandwidth. This technique has been applied to several days of digital ionosonde data. The resulting values of dispersive bandwidth are reasonable and plotted over a diurnal cycle. Such a technique should be further developed as a step toward eventual application to ionospheric informatics.
Proceedings of the 70th International Symposium on Molecular Spectroscopy, 2015
Journal of Quantitative Spectroscopy and Radiative Transfer, 2015
Structure and dynamics of the ionosphere are explored under this contract by digital high-frequen... more Structure and dynamics of the ionosphere are explored under this contract by digital high-frequency sounding techniques. The research emphasizes the investigation of the auroral and subauroral ionosphere, but also includes studies on the polar-cap and mid-latitude ionosphere.
Journal of Quantitative Spectroscopy and Radiative Transfer, 2005
Journal of Geophysical Research, 1994