Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa33b1777b&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SA33B-1777
Physics
[0335] Atmospheric Composition And Structure / Ion Chemistry Of The Atmosphere, [0355] Atmospheric Composition And Structure / Thermosphere: Composition And Chemistry
Scientific paper
The topside ionosphere lies above the F2 peak and merges into the protonosphere where H+ ions dominate. The ion-electron plasma assumes a distribution close to that appropriated to diffuse equilibrium under gravity, with departures from diffusive equilibrium arising from the effect of such factors as neutral winds and electric fields. At this region the main conversion process is the charge exchange reaction (O++H«O+H+) and a considerable fraction of H+ may also be produced by direct photoionization of neutral H by the solar EUV radiation of wavelengths less than 91nm, and this characteristic transfer a strong dependence of the H+ and O+ with the solar activity. The transition height of the H+ and O+ ions (ht) is an important parameter that defines the distribution of these ions in the topside ionosphere and it is defined as the altitude where the H+ and O+ concentrations are equal and marks the transition from the topside ionosphere and protonosphere and also is strong dependent of the solar activity and season. The purpose of this work is to evaluate the responses of the topside/protonosphere over Arecibo Observatory (18.35oN, 66.75oW) based on Incoherent Scatter Radar data due to solar activity and season variations. For this reason we analyzed the ISR data commencing from1998 through 2010, plus the UV and EUV measurements for broad wavelength ranges from 26 to 34nm and 0.1 to 50nm by Solar EUV Monitor aboard the Solar Heliospheric Observatory (SOHO).
Alcántara D. G.
Brum C. G.
González Sixto A.
Vargas Jorge
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