Inferring D-Region Parameters Over Arecibo Using Incoherent Scatter Radar

Details Inferring D-Region Parameters Over Arecibo Using Incoherent Scatter Radar Inferring D-Region Parameters Over Arecibo Using Incoherent Scatter Radar

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa41a0263r&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA41A-0263

Physics

0335 Ion Chemistry Of The Atmosphere (2419, 2427), 2419 Ion Chemistry And Composition (0335), 2427 Ionosphere/Atmosphere Interactions (0335), 6929 Ionospheric Physics (1240, 2400)

Scientific paper

We used two radar modes with the aim of measuring D-region parameters on July 23, 2006 using. One mode employed the usual practice in these experiments to measure 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. It used a high resolution coded long pulse (random code) transmissions to measure both the ion and plasma lines. The ion line primarily provided a power profile connecting the D-region to the 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. These measurements allowed us to calibrate power profiles obtained from CLP data in 100 - 150 km altitude range. Electron concentration was found to be in the range of a few hundred to 5000 cm-3 between 65 - 90 km altitude ranges. In order to infer the negative ions, D-region spectras were fitted to a folded Lorentzian in accordance with the previous theoretical work and the spectral width used to calculate the ratio of negative ion to electron concentration (λ). During morning hours between 9 - 11 hrs LT, 2.5 km thick layer of negative ions was observed with λ ~ 1.6 ± 0.3 between 74 to 77 km. From spectral widths in the altitude range of 81 to 91 km, we inferred temperatures using ion-neutral frequency that are found to be in the range of 195 to 215 K.

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