Ion gyroresonance observations at Jicamarca revisited

Details Ion gyroresonance observations at Jicamarca revisited Ion gyroresonance observations at Jicamarca revisited

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3413107r&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 13, CiteID L13107

Physics

Ionosphere: Instruments And Techniques, Ionosphere: Topside Ionosphere, Ionosphere: Ion Chemistry And Composition (0335), Ionosphere: Equatorial Ionosphere, Ionosphere: Plasma Temperature And Density

Scientific paper

This paper presents recent observations of the proton gyroresonance over Jicamarca. In October 2006, a single-polarization double-pulse experiment was set up to measure the first gyroresonance peak in the incoherent scatter (IS) auto-correlation function (ACF). Despite the clutter caused by Spread-F and artificial satellites, it was possible to measure the first proton gyroresonance peak of the ACF in the topside ionosphere. For the first time, least-squares fits of theoretical IS ACFs to gyroresonance measurements are reported. Theoretical ACFs that best fit the measurements were found using the H+ fraction and temperature (assuming T e = T i ) as fitting parameters. Uncertainties for the estimated fraction of H+ were as low as 12%, while uncertainties for estimated temperatures were around 30%. These are the first successful gyroresonance measurements since the early observations of Farley (1967), and it is the first time measurements of this type have been used to obtain least squares estimates of ion composition and temperatures.

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