Meteoroid head echo polarization features studied by numerical electromagnetics modeling
نویسندگان
چکیده
منابع مشابه
Meteoroid head echo polarization features studied by numerical electromagnetics modeling
[1] Meteoroid head echoes are radar returns associated with scatter from the dense plasma surrounding meteoroids striking the Earth’s atmosphere. Such echoes are detected by high power, large aperture (HPLA) radars. Frequently such detections show large variations in signal strength that suggest constructive and destructive interference. Using the ARPA Long‐Range Tracking and Instrumentation Ra...
متن کاملA new method for determining meteoroid mass from head echo data
[1] A head echo is the radar reflection from the plasma immediately surrounding a meteoroid upon its entry into the Earth’s atmosphere; analysis of these plasmas can help determine a parent meteoroid’s inherent properties, such as mass. In the past, meteoroid mass was calculated using head echo velocity and deceleration data by assuming momentum conservation between the meteoroid and air molecu...
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Large-aperture radars detect the high-density plasma that forms in the vicinity of a meteoroid and moves approximately at its velocity; reflections from these plasmas are called head echoes. To determine the head plasma density and configuration, we model the interaction of a radar wave with the plasma without using assumptions about plasma density. This paper presents a scattering method that ...
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This paper examines current techniques used to determine meteoroid mass from high-power, large aperture (HPLA) radar observations. We demonstrate why the standard approach of fitting a polynomial to velocity measurements gives inaccurate results by applying this technique to artificial datasets. We then suggest an alternate approach, fitting velocity data to an ablation model. Using data taken ...
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We report the observation and analysis of ionization flashes associated with the decay of meteoroids (socalled head echos) detected by the Arecibo 430 MHz radar during regular ionospheric observations in the spring and autumn equinoxes. These two periods allow pointing wellabove and nearly-into the ecliptic plane at dawn when the event rate maximizes. The observation of many thousands of events...
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ژورنال
عنوان ژورنال: Radio Science
سال: 2011
ISSN: 0048-6604
DOI: 10.1029/2011rs004774