Other
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsa31a..07r&link_type=abstract
American Geophysical Union, Spring Meeting 2007, abstract #SA31A-07
Other
2415 Equatorial Ionosphere, 2467 Plasma Temperature And Density, 2494 Instruments And Techniques, 6969 Remote Sensing, 6974 Signal Processing (0674)
Scientific paper
Sulzer and Gonzalez (1999) found that electron coulomb collisions have an important effect on the incoherent scattering of radio waves by a plasma at small aspect angles. The primary effect of electron coulomb collisions on incoherent scattering at small aspect angles is the narrowing of the spectrum. Another interesting effect of the collisions is the control of the efficiency factor (Milla and Kudeki, 2006), which is defined as a proportionality factor between the plasma electron density and the normalized total scattering cross section. For unmagnetized plasmas or the case of large aspect angles, the efficiency factor is approximately 1/(1+Te/Ti). Milla and Kudeki (2006), however, pointed out that the efficiency factor is far more complicated for small aspect angles. An analytical expression of the efficiency factor for small aspect angles does not exist yet. In this work, proper efficiency factor for Jicamarca measurements were obtained using numerical integration of the incoherent scatter spectrum including magnetic field and coulomb effects. The results were used to correct backscattered power profiles measured at Jicamarca. Corrected power profiles were compared with electron density profiles measured simultaneously using Faraday rotation. A good agreement between corrected power profiles and electron density profiles has been found. This result not only improves electron density measurements at Jicamarca, but also validates the formulation of Woodman (2006) and Kudeki and Milla (2006) based on the coulomb effects discovered by Sulzer and Gonzalez (1999).
Chau Jorge L.
Hysell Dave L.
Nicolls Michael J.
Rodrigues Fabiano S.
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