Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa33a1443b&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SA33A-1443
Physics
[2439] Ionosphere / Ionospheric Irregularities, [6964] Radio Science / Radio Wave Propagation, [6982] Radio Science / Tomography And Imaging, [7944] Space Weather / Ionospheric Effects On Radio Waves
Scientific paper
ASTRA and Cornell University have a joint project underway to develop an inverse diffraction tomography algorithm suitable for a two-dimensional array of GPS receivers located in the equatorial region. A significant component of the research involves development of an accurate, realistic electro-magnetic propagation forward model that goes from the GPS satellites to the array of ground receivers. The forward model will be used to test the accuracy of the inverse diffraction tomography algorithm, help select the optimal method of doing the inversion, allow for comprehensive, sophisticated non-linear inversions, and help provide insight to the science that will result from the inversion analysis. The method of approach to the forward model includes a realistic 3D model of the electron density irregularities, arbitrary time-varying geometry between satellite and ground receiver array and multiple phase screens to allow for strong scattering. The focus of this talk is on the development of the 3D spectrum of the irregularities, and how the 3D spectrum can be generated from observed in-situ 1D spectra from rockets or satellites such C/NOFS. The C/NOFS satellite has an in-situ Plasma Langmuir Probe (PLP) sensor that is capable of measuring electron density fluctuations at sample rates of 512 Hz. Preliminary analysis has been performed on these fluctuations. Spectra have been calculated for a number of different altitudes and local times. Preliminary results are presented from this research and, assuming a power law form for the spectra, spectral indices are calculated. Given observed 1D spectra of the irregularities, a theoretical analysis will be presented that allows recovery of the 3D spectrum of irregularities from the observed 1D spectra. Preliminary calculations of such 3D spectra derived from the observed C/NOFS 1D spectra will be presented.
Bust Gary S.
Kelley Michael C.
Psiake M.
Roddy Patrick A.
Rodrigues Fabiano S.
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