Diurnal variation of non-specular meteor trails
نویسندگان
چکیده
منابع مشابه
Interpretation of non-specular radar meteor trails
[1] Radar data of non-specular meteor trails shows two clear and consistent features: (1) non–specular meteor trails are observed from a narrower altitude range than are head echoes and (2) an approximately 20 ms delay between meteor head echoes and trail radar scatter. This paper shows that both features can result from meteor trail plasma instability. Simulations have demonstrated that trails...
متن کاملRadar observations of meteor trails
Introduction Conclusions References Tables Figures Back Close Abstract Introduction Conclusions References Tables Figures Back Close Abstract A Fresnel Transform technique has been developed at Adelaide to analyse radar meteor echoes detected in the transverse mode. The genesis for this technique was the study of the structure of the scattering ionization immediately behind the head of the trai...
متن کاملPlasma instabilities in meteor trails: Linear theory
[1] Ablation of micrometeoroids between 70 and 130 km altitude in the atmosphere creates plasma columns with densities exceeding the ambient ionospheric electron density by many orders of magnitude. Density gradients at the edges of these trails can create ambipolar electric fields with amplitudes in excess of 100 mV/m. These fields combine with diamagnetic drifts to drive electrons at speeds e...
متن کاملThe phenomena of meteor-burst propagation using reflections from ionized meteor trails is described in Recommendation
The ITU Radiocommunication Assembly, considering a) that experiments have already shown the practicability of utilizing the frequency band between 30 and 50 MHz for transmission by meteor-burst propagation to distances well beyond the horizon; b) that systems using this mode of propagation are already in service for burst data transmission, recommends 1. that Annex 1 be used as guidance for the...
متن کاملMeteor velocity determination with plasma physics
Understanding the global meteor flux at Earth requires the measurement of meteor velocities. While several radar methods exist for measuring meteor velocity, they may be biased by plasma reflection mechanisms. This paper presents a new method for deriving meteoroid velocity from the altitudinal extent of non-specular trails. This method employs our recent discoveries on meteor trail plasma inst...
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ژورنال
عنوان ژورنال: Annales Geophysicae
سال: 2009
ISSN: 1432-0576
DOI: 10.5194/angeo-27-1961-2009