Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jgra..11312302r&link_type=abstract
Journal of Geophysical Research, Volume 113, Issue A12, CiteID A12302
Other
4
Ionosphere: Ion Chemistry And Composition (0335), Ionosphere: Instruments And Techniques, Atmospheric Composition And Structure: Ion Chemistry Of The Atmosphere (2419, 2427), Ionosphere: General Or Miscellaneous, Ionosphere: Ionosphere/Atmosphere Interactions (0335)
Scientific paper
With the increased sensitivity and bandwidth, Arecibo 430 MHz incoherent scatter radar was run on 23 July 2006 using two radar modes with a focus on measuring D region parameters. One mode measured the ion line spectra over D region altitudes; the other mode was used as a new way to calibrate the electron densities in the D region and also to correct the ion line spectra. The ion line primarily provided a power profile connecting the D region to altitudes where the plasma line is useful. The plasma line provided the absolute electron density, used in the lower altitudes for calibration, and at F region altitudes for determining the baseline level in the D region spectra due to the folding-in of F region scattered power. It is found that the electron line contribution is about 1-3 times the ion line between 60-75 km altitude ranges. Electron concentration was found to be in the range of a few hundred to 5000 cm-3 in the 65-90 km altitude range. The new technique agrees well with the previous measurements. The D region spectral widths were used to calculate the ratio of negative ion to electron concentration (λ). Between 0900 and 1100 LT, a 4 km thick layer of negative ions was observed with λ ~ 1.6 +/- 0.3 around 73-77 km. In the altitude range of 81-91 km, we inferred temperatures ~ 195-215 K using ion-neutral collision frequencies determined from the spectral widths.
González Sixto A.
Nicolls Michael J.
Raizada Shikha
Sulzer Michael P.
Tepley Craig A.
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