The Plasma Physics of Using Non-Specular Radar Meteor Echoes to Monitor Lower Thermosphere Wind Profiles

Details The Plasma Physics of Using Non-Specular Radar Meteor Echoes to Monitor Lower Thermosphere Wind Profiles The Plasma Physics of Using Non-Specular Radar Meteor Echoes to Monitor Lower Thermosphere Wind Profiles

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsa21a..05o&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #SA21A-05

Physics

2439 Ionospheric Irregularities, 2442 Meteor-Trail Physics, 2471 Plasma Waves And Instabilities (2772), 3369 Thermospheric Dynamics (0358), 3389 Tides And Planetary Waves

Scientific paper

We will present a new method of measuring lower thermospheric wind velocity profiles by tracking non-specular meteor echoes in time. This approach relies on having a radar following plasma irregularities as they are dragged by the neutral wind. This requires a VHF radar with interferometric capability able to point close to perpendicular to the geomagnetic field. Using a small sample of data from the Jicamarca Radio Observatory, we calculated wind speeds and directions between 90 and 110 km with a range resolution of a few hundred meters. The measurements taken show speeds reaching 150m/s and sometimes changing by as much as 100m/s over a 6km altitude range. With some refinement of the data collection and analysis techniques, we expect that one could obtain high resolution images of lower thermospheric winds as they change in both altitude and time. We will discuss these results, the physics underlying these measurements, and the limitations.

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