Some Results of Simultaneous Photographic, Television, Spectral, and Radar Observations of Meteors in Tajikistan
Abstract
The Institute of Astrophysics of the National Academy of Sciences of Tajikistan is one of the first research institutions where, since the late 1960s, various optical observational instruments were introduced at the Hisar Astronomical Observatory (HisAO), including photographic, spectral, and television systems, as well as a radar complex: MIR-2 and MIR-3. From 1977 to 1980, the Institute carried out comprehensive photographic, spectral, television, and radar observations of major annual meteor showers and the sporadic background for the first time. Analysis of the collected data revealed: one simultaneously recorded photo-television meteor, eight photo-radar meteors (meteor No. 770954 having a spectrum obtained via instantaneous exposure), and 57 jointly recorded radio-television meteors.
The results of simultaneous radio-optical observations of meteors allowed the authors to obtain for the first time: (a) light and ionization curves for the same meteors; (b) measurements of meteor velocities using two methods: (1) radar; and (2) based on combined radio-television observations;
(c) determination of the photometric and ionization masses of meteoroids; and (d) a study of the structure of stream and sporadic meteoroids. Combining the results of simultaneous radio-optical observations of meteors in Tajikistan with similar data obtained in Harvard, Ottawa, and Jodrell Bank made it possible to investigate the dependence of the logarithm of the light-to-ionization intensity ratio on velocity for two groups of meteors by stellar magnitude: (a) bright and (b) faint meteors. The results also made it possible to analyze the dependence of meteor radio magnitude on velocity, which is crucial for the mutual interpretation of optical and radar observational data.
About the Authors
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