Other
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsa21b..04n&link_type=abstract
American Geophysical Union, Spring Meeting 2009, abstract #SA21B-04
Other
0310 Airglow And Aurora, 0355 Thermosphere: Composition And Chemistry, 2415 Equatorial Ionosphere, 3369 Thermospheric Dynamics (0358)
Scientific paper
A Fabry Perot interferometer has been installed in Carmen Alto in the Atacama desert of northern Chile for the currently ending solar cycle 23. The instrument is located under very dark skies at a site that is almost always free of cloud cover. Observations provide horizontal neutral wind measurements for the upper thermosphere for an altitude of approximately 230 km. Approximately 100 km south of Carmen Alto, a spaced receiver system has been measuring the UHF and L-band signal from beacons aboard geostationary satellites. If ionospheric structure is present, the unique signature in the radio signal at one element of the receiver system may be correlated with that in the other element providing a measure of the zonal plasma drift. This paper will describe the long term neutral wind data sets observed by the optical system at Carmen Alto. Both the zonal and the meridional components of the neutral wind are measured utilizing the line of sight Doppler shift of OI (6300A) airglow emission. Comparisons between the zonal component of the neutral wind and the zonal plasma drift usually indicate a high degree of coherency between the two independent observations. Future observations with identical systems along the same geomagnetic latitude will provide important information relating to the propagation and the evolution of low latitude ionospheric irregularities.
Araya Valenzuala J.
Niciejewski Rick
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